2021 silverado 6 speed transmission problems

6. Bad Transmission Fluid. Like your automatic transmission, the torque converter is full of transmission fluid. This fluid helps cool the converter and transfers energy. If your Silverado has bad transmission fluid, it can cause the torque converter to go bad. Taking a look at the transmission fluid should be the first thing that you do.

Not sure about the 10spd, but the 8 and 9 spd's had a shudder problem (with TSB's) at light throttle and between 20-40mph, usually 3rd or 4th gear. Do a double dump (drain and fill (change the filter) run a couple hundred miles, then drain and fill again). Then change every 30K.It was fitted to the GMC Silverado and GMC Sierra 2500HD and 3500HD with 6.0L engines between 2007-2014 and 2015-2019. The GMC Sierra and Silverado 2500HD and 3500HD 6.6 LT8 engines featured with the 6L90 between 2020 and now. What’s better, a 6 or 8-speed transmission? An eight-speed transmission is better than a 6-speed tranny.Beginning in 2005, the Silverado got the 6 speed transmission. The more pronounced problems with the transmission, however, did not start showing up until the 2012 to 2019. In this model, these were the most commonly reported issues: Jerky shifting of gears. Erratic down and up shifting.My 2021 Silverado 5.3, 8 speed was built in Sept. 2020. I had rough downshifts a slow speeds. ... The 8 speed is a pretty good transmission. Besides torque converter shudder and minor shifting issues I haven't seen many internal failures. ... #6 · Mar 14, 2023. Thought they disposed in lew of the ten speed guess I was wrong I think …Oct 23, 2022 · Shuddering transmission when cold. Fix or replace the transmission. Hard 1st to 2nd gear change. Fix or replace the torque converter clutch. Slipping Transmission. Tighten connectivity or replace the throttle position sensor. Completely non-functioning vehicle. Replace transmission. Whining noises. 8 speed or 10 speed. My wife and I are in the market for a 2020 or 2021 GMC Sierra 1500 or Silverado 1500. While looking at and researching available trucks with the 5.3 L engine, I have come across ones with 6 speed, 8 speed, and 10 speed transmissions. I had heard about issues with the 8 speed and was avoiding it but also …Sep 19, 2022 ... Ford F-150 truck review. Please DO NOT Buy a Ford (Unless It Has This Transmission), DIY and car review with Scotty Kilmer.2021 Chevrolet Silverado 1500 LT Trail Boss 4dr Crew Cab 4WD 6.6 ft. SB (5.3L 8cyl 10A) 2 TRUCKS - 90,000 TOTAL MILES - 1 FAILED ENGINE - 1 FAILED TRANSMISSION.

12. Points. 3. Aug 21, 2022. #13. My 2020 5.3l 10 speed Trail Boss is going in the shop tomorrow. Noticeable whine from the engine/transmission. No warning lights or hard shifting, just a whine. Dealer/service rep. said it is the 10 speed transmission, just from listening to it.Changing the transmission fluid and filter on my 2019 Silverado 1500 8L90 8-speed transmission.Owner’s manual recommends service at 45,000 mile intervals. Fl...2021 2500HD Transmission Problem. My father in law has a 2021 GMC with around 5,000 miles. Empty and loaded the transmission is hard up and down shifting. It’s been doing it since new. It doesn’t always do it but …There may be several shudder concerns while driving on some 2020-2021 Silverado, Tahoe, Suburban, Sierra, Yukon and Escalade models that may be mistaken as a transmission-related concern. If the concern is on a vehicle equipped with the 4.3L V6 engine (RPO LV3), 5.3L V8 engine (RPO L82, L84, or 6.2L V8 engine (RPO L87), it may be related to the ...The big-boned Ram (5,960 pounds) truly lags, needing 6.6 seconds to hit 60 mph and a full 15 seconds to do the quarter mile, travelling at 93.4 mph. The Silverado definitively loses the braking ...I bought a 2021 xt5 400 AWD July 18. Wife was driving. After waiting at a red light she was making a left turn from a two way road to a two way road, the car bucked a few times, failed to upshift ...My 2021 Silverado 5.3, 8 speed was built in Sept. 2020. I had rough downshifts a slow speeds. ... The 8 speed is a pretty good transmission. Besides torque converter shudder and minor shifting issues I haven't seen many internal failures. ... #6 · Mar 14, 2023. Thought they disposed in lew of the ten speed guess I was wrong I think …

6. Bad Transmission Fluid. Like your automatic transmission, the torque converter is full of transmission fluid. This fluid helps cool the converter and transfers energy. If your Silverado has bad transmission fluid, it can cause the torque converter to go bad. Taking a look at the transmission fluid should be the first thing that you do.N/A. Average Mileage: 4,000 mi. The 2021 Chevrolet Silverado 1500 has 280 problems & defects reported by Silverado 1500 owners. The worst complaints are engine, accessories - interior, and body ...2021 Chevrolet Silverado 3500HD Summit White Duramax 6.6L V8 Turbodiesel ***3500HD CREW CAB 4X4!!! 6.6L DURAMAX DIESEL ENGINE!!! 10-SPEED ALLISON TRAN...The Silverado 4 cylinder turbo is intriguing. I liked our ’07 Avalanche which, although a half-ton, had an optional 2500-series drivetrain (6.0 Vortec, heavy duty transmission, 4.10 gears). Great for towing a 6,000 lb travel trailer. The only problem was excessive oil consumption after 100K miles, likely due to the Active Fuel Management …Aug 17, 2021 ... ... Silverado, 6 cylinder, 3.23 rear gears, and a 6 speed transmission. 5th gear in my transmission is the same ratio as 8th gear in the 10 speed.RedSLEd. 12269 posts · Joined 2015. #2 · Dec 10, 2021. There have been a lot of complaints about the 8-speeds with hard shifting, vibrations, etc. Not uncommon. There is a TSB on it to put in new (ish), special Mobil1 fluid that has helped many, but not all, resolve some of these issues.

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Chevy 6.6 gas problems include low-quality transmission, malfunctioning alternators, insufficient load handling capacity, low speed, less horsepower, malfunctioning springs, additional fuel loss, and a broken time chain. ... A 6.6 liter V8 utilizes 6-speed transmission, which has a low performance than 8-speed and 10-speed. ... Chevy …2020-2022 2500HD Transmission Fluid Check Procedure.pdf. 190.1 KB Views: 286. 2020-2022 2500HD Transmission Fluid Change-fill Procedure.pdf. 697.7 KB Views: 130. 2500HD Transmission Fastener Spec and Bolt Sequence.pdf. 3.9 MB Views: 108. 2500HD Transmission Fluid Capacities.pdf.#1 · Nov 27, 2018. I have had my 2018 Silverado LT Crew Cab Z71 for about two months. It has the 6 speed automatic transmission. It hesitates, lags, wanders and is woefully …2017 GMC Sierra 24k miles. Started realizing truck shifted hard in low gear or down shifting. I decided to take it into the dealer. The dealership had done a transmission relearn. After a few week ...October 20, 2022. The transmission fluid temperature of some 6L80 6-speed automatic transmissions (RPO MYC) and 6L90 6-speed automatic transmissions (RPO MYD) may be too hot under some operating conditions. Affected models include 2014-2020 Tahoe, Suburban, Yukon; 2014-2021 Silverado 1500, Silverado 2500HD/3500HD, Express, …XSE Hatchback 6-Speed Transmission Problem. Driving home from work last Thursday with my windows down I noticed an odd noise coming from the area of the transmission. I shifted gears and the noise persisted. With the clutch disengaged the noise stopped. Even with the shifter in neutral and the clutch engaged the noise was present.

175 posts · Joined 2010. #1 · Nov 4, 2021. My 2021 Sierra 5.3l has a very annoying vibration, like it's lugging. My truck has the 10 speed automatic transmission and when I'm on a flat road and cruising at a set speed (anywhere between 30 to 65 mph) there is a vibration that comes through the steering wheel and also the gas pedal. Maintaining your Chevrolet Silverado 1500 transmission fluid is one of the best ways to maintain your transmission's health. A general rule of thumb is to have your transmission fluid checked and changed about every 30,000 to 60,000 miles, but that timeline can change if you're hard on your Chevrolet. The good news is that transmission fluid ... There are many different signs of transmission problems, all of which are important to be aware of — a defective transmission can put the car’s driver and passengers at risk of getting into a car accident. Some of the most common transmission problems GM drivers reported include: Illuminated check engine light. Loss of power. …There are 10 separate parts needed for the replacement, for a total of 21 pieces in all. Some notable items include: Transmission. Exhaust Manifold Pipe Seal. Transfer Case Adaptor Gasket ... Install Transmission Thermal Bypass Valve (TBV) For Any Repair Including CCND That Does Not Require Removal of the Transmission 0.6 hr *This is a unique Labor Operation for Bulletin use only. Version 4 Modified Released September 24, 2021 Revised October 05, 2021 - Removed Escalade Models, 2014 from Suburban, Tahoe and There may be several shudder concerns while driving on some 2020-2021 Silverado, Tahoe, Suburban, Sierra, Yukon and Escalade models that may be mistaken as a transmission-related concern. If the concern is on a vehicle equipped with the 4.3L V6 engine (RPO LV3), 5.3L V8 engine (RPO L82, L84, or 6.2L V8 engine (RPO L87), it may be related to the ...Engine, powertrain, electrical system, and brake issues are among the top complaints received by the NHTSA from vehicle owners. Updated on November 15th, 2023 Author: Brian Jones | Reviewer: Sergei Lemberg. 2021 Chevrolet Silverado 1500. When it comes to finding a pickup truck, many consumers flock to the 2021 Chevrolet Silverado 1500.Take a long breath: Here’s how it all breaks down. The base engine in the Silverado is a 4.3-liter V6 that makes 285 horsepower and 305 lb-ft of torque. It is connected to a 6-speed automatic transmission. Rear-wheel-drive (RWD) models earn an estimated 16 mpg city/21 mpg highway and 17 mpg combined.

175 posts · Joined 2010. #1 · Nov 4, 2021. My 2021 Sierra 5.3l has a very annoying vibration, like it's lugging. My truck has the 10 speed automatic transmission and when I'm on a flat road and cruising at a set speed (anywhere between 30 to 65 mph) there is a vibration that comes through the steering wheel and also the gas pedal.

There are 10 separate parts needed for the replacement, for a total of 21 pieces in all. Some notable items include: Transmission. Exhaust Manifold Pipe Seal. Transfer Case Adaptor Gasket ...The price of the 2021 Chevrolet Silverado 1500 starts at $28,995 and goes up to $55,295 depending on the trim and options. We recommend the well-equipped LT model with the 5.3-liter V-8, crew cab ...Am hearing a lot of flack about possible major problems with the trans. Have'nt noticed anything yet but i am new to the 6 speed shift patterns. Any suggestions as to whether it would be a good idea to get a flush and filter change? Or are there any recalls or manufacturer upgrades available?It almost goes without saying that checking and changing your vehicle’s fluids regularly is essential for keeping it running its best. And when it comes to your Chevy truck, there ...Worn Clutch (Manual Transmission) This is another very common reason why your Chevy Silverado manual transmission won’t shift. In cars, with a manual transmission, you need to step on the clutch before the gear can shift. If the clutch is worn, then the gear stick won’t shift or you would have very rough shifts.May 31, 2023 · 755 posts · Joined 2023. #1 · May 31, 2023 (Edited) Hi All, I'm brand new here but active on other GM forums where the 6L transmissions are actively being discussed so figured I'd start a similar all-encompassing transmission thread with videos, links and other information as it relates to the 6L80/90 transmissions. Anonymous, MI (2021 Chevrolet Silverado 1500 LT 2.7-L 4 Cyl turbo) Other major engine problem "Lifters broke after only 6 months.Page 4 March, 2021 Bulletin No.: 21-NA-047 any other known vehicle vibration issues (tires, brakes, etc.) before conducting test. If TCC Shudder is present, a vibration peak will appear. TCC Shudder vibration frequency is stationary in 8th gear. If the vibration frequency follows vehicle speed or engine speed, then it is NOT TCC Shudder.If you have a GM Truck or Van with a 6-speed transmission, built after 2006, these issues are likely to affect your truck. ... Transmission Problems; Clutch Repair & Replacement; All Transmission Services; ... Chevrolet Silverado, (T1XX) 2019-2021 Chevrolet Silverado2014-2019 (K2XX) Chevrolet Suburban 1500, 2009-2020

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Some signs of transmission problems are the transmission refusing to go into gear, the smell of burning transmission fluid and noises coming from the transmission when the car is i...Read the next 8 complaints ». The 2016 Chevrolet Silverado 1500 has 28 problems reported for transmission failure. Average repair cost is $4,770 at 87,000 miles.I’ve had my Pulsar LT installed for about 2 weeks on my 2020 6.2L 10-speed Silverado. So far all is well, corrected my tire size, disabled the DFM and the auto shutoff. The throttle response set ...I've seen many videos and pics of posting their transmission flushes/filter replacements and I felt I needed to post mine. I don't have pics fyi. I have just under 31k on my truck. My truck is a '21 denali with the GM built 10 speed, and L5P. This motor and trans has been great until I got stuck in mud.Little is sexier than telling a friend or loved one, “Hey, can you give me a minute? I have to finish testing my download speeds, then we can head out to the party.” But if you are...TSB 06-07-30-013 – Shudder in 6th gear – Allison 1000 Transmission. 2006 Chevrolet Silverado 2500HD – 2006 GMC Sierra 2500HD. Problem – Owners may experience a shudder occurs in 6th gear in 4Hi between 46 mph (74 km/h) and 49 mph (79 km/h). Solution – Reprogram the TCM with TIS version 6.0 or higher.How is driving the 2020 Chevy Silverado 1500? Their 2020 Chevy Silverado 1500 is equipped with the 5.3-liter V8 engine. It’s the more popular option even though the 6.2-liter engine with 420 hp is available. The 5.3-liter engine has 355 hp and 383 lb-ft of torque and is paired with a 10-speed automatic transmission.Chevrolet Silverado (double cab, crew cab) 6.2L V8 L86 NA: Chevrolet Tahoe: 5.3L V8 Vortec NA: ... TSB Seems To Fix 8-Speed Automatic GM Transmission ProblemsAugust 13, 2019; ….

Decreased Fuel Efficiency. One of the most significant problems with the Chevy 6.6 gas engine is its decreased fuel efficiency. This engine is known for consuming a lot of fuel, which can be a significant expense for truck owners. The engine’s inefficient fuel consumption can be due to a variety of factors, including its size, weight, and ...Aug 30, 2021. #6. I'm having a similar issue with my 2021 Trail boss 5.3 with 10 speed trans. just started at 1000 miles and I'm experiencing a violent stutter between 20 and 40 mph it feels like truck is lurching forward and back or possibly cant find the right gear. Only at very light throttle when pulling away from stop lights and holding ...The assembly defect then prevents the transmission cooler from working properly- causing performance issues. So, if your brand new 2021 Chevrolet Silverado, GMC Sierra, Chevy Tahoe / Suburban, GMC Yukon, or Cadillac Escalade isn’t shifting quite right and only has a few miles on the odometer, this problem may be to blame. The good news is ...A shift flare occurs when your transmission fails to shift smoothly up through the gears. You may notice that your engine revs rise but your Chevy fails to accelerate at a corresponding speed. When this …This article applies to the Chevrolet Silverado 2nd Generation (2007-2013). If your transmission isn’t acting right, its undesirable behavior could include one or more of the following: Taking too long to shift; the engine revs higher than normal RPMs before a shift happens. Making hard shifts, which occur with a noticeable clunking noise and ...speed, transmission fluid temperature, and gear command. To Learn C1 (For 6-7 or 3-1 Shift) 1. Pressure Learns: Note: It is recommended to utilize a road with a speed limit between of 48-72 km/h (30-45 mph) for this procedure. • Shift the transmission into 6th gear with the PRNDM in the M position. Obtain an engine speed between 1000 and 1600 ...The GM lifter problems seem to be most prevalent in the L84 5.3-V-8 and L87 6.2-liter EcoTec3 V-8 engines with build dates between September 2020 and March 2021. These engines are the newer variable displacement design, which uses DFM rather than the older AFM system. The vehicles seem to be failing with less than 10,000 miles …To Learn C4 (For 1-2, 5-6, or 7-8 Shift) 1. Pressure Learns: Note: It is recommended to utilize a road with a speed limit between of 64-72 km/h (40-45 mph) for this procedure. • Shift the transmission into 7th gear with the PRNDM in the M position. Obtain an engine speed between 1000 and 1750 rpm. Maintain this condition for a total of about ...Sep 13, 2021 · 7. Lower the vehicle to a safe level on the hoist and operate the transmission through all 6 gear forward ranges, reverse and neutral. 8. Remove transmission oil pan and drain, clean pan and replace the transmission filter. 9. Fill the transmission with 6 quarts of DEXRON VI Transmission Fluid. It is important to note that these conditions: Do not occur during vehicle launch from a stop. Do not occur when the transmission is shifting gears. Do not occur when the vehicle is decelerating. Do not occur when TCC slip speed is zero. TCC slip speed is zero in gears 2-8 when engine RPM is greater than 1600 RPM. 2021 silverado 6 speed transmission problems, Page 4 March, 2021 Bulletin No.: 21-NA-047 any other known vehicle vibration issues (tires, brakes, etc.) before conducting test. If TCC Shudder is present, a vibration peak will appear. TCC Shudder vibration frequency is stationary in 8th gear. If the vibration frequency follows vehicle speed or engine speed, then it is NOT TCC Shudder., Chevrolet Silverado (double cab, crew cab) 6.2L V8 L86 NA: Chevrolet Tahoe: 5.3L V8 Vortec NA: ... TSB Seems To Fix 8-Speed Automatic GM Transmission ProblemsAugust 13, 2019; , Mar 21, 2023 · GM, which represents the owners of various GM vehicles who have one of two models of eight-speed automatic transmissions — the GM 8L90 or 8L45 — made between 2015 and March 1, 2019. The ... , Nov 27, 2018 · I have had my 2018 Silverado LT Crew Cab Z71 for about two months. It has the 6 speed automatic transmission. It hesitates, lags, wanders and is woefully indecisive when shifting particularly at speeds under 55mph. I travel mostly during rush hour and there is a lot of stop and go driving so I have noticed this transmission issue at those times ... , Jan 25, 2021 · My 2016 6-speed had the shudder too. First was the fluid change and flush. Next was converter and pump. Still upshifted and downshifted at will. While it was there the last time for almost a month they gave me a 2021 as a loaner which was a trick. I really liked the new 8-speed. I talked with GM customer service and worked out an assisted trade. , There are many different signs of transmission problems, all of which are important to be aware of — a defective transmission can put the car’s driver and passengers at risk of getting into a car accident. Some of the most common transmission problems GM drivers reported include: Illuminated check engine light. Loss of power. …, , GM is adding an electric Chevrolet Silverado pickup truck to its lineup, as the automaker pushes to deliver more than 1 million electric vehicles globally by 2025. GM President Mar..., 4. Remove the transmission oil cooler pipe assembly from the transmission. 5. Install the DT-52263-1 Adapter Block Assembly (1), reusing the seal from the transmission oil cooler pipe assembly. 6. Tighten the bolt (2) to 22Y (16lbft). 7. Place the hose (3) in the GE-47716-2 Graduated Measuring Bucket, utilizing a Spring Clamp to retain the hose., Our remanufactured transmission warranty is 36 months or 5,000 miles. Because the transmissions have been remanufactured at our facility, the warranty can be honored …, The Silverado 4 cylinder turbo is intriguing. I liked our ’07 Avalanche which, although a half-ton, had an optional 2500-series drivetrain (6.0 Vortec, heavy duty transmission, 4.10 gears). Great for towing a 6,000 lb travel trailer. The only problem was excessive oil consumption after 100K miles, likely due to the Active Fuel Management …, Common possibilities: Transmission clutches slipping (might try replacing transmission fluid w/fresh stuff) Solenoid problem (as above) Sensor problem. Mustangman September 28, 2022, 2:35am 4. If it really IS slipping, it won’t do it very long and you’ve registered the warranty complaint with GM. If it fails, you should be covered., Chevrolet Silverado (double cab, crew cab) 6.2L V8 L86 NA: Chevrolet Tahoe: 5.3L V8 Vortec NA: ... TSB Seems To Fix 8-Speed Automatic GM Transmission ProblemsAugust 13, 2019;, I have had my 2018 Silverado LT Crew Cab Z71 for about two months. It has the 6 speed automatic transmission. It hesitates, lags, wanders and is woefully indecisive when shifting particularly at speeds under 55mph. I travel mostly during rush hour and there is a lot of stop and go driving so I have noticed this transmission issue at those times ..., 6 posts · Joined 2022. #1 · Feb 12, 2022. 2017 Silverado LT 5.3 4X4 6speed transmission 51,000 miles. Truth in advertising: I posted this at the gmtrucks site but only got a few responses then I saw all the 6L80 posts here, so here I am. When I first bought the truck the transmission suffered from severe bucking or shudder under light load., Mar 17, 2014 ... 6 years ago ... I had a 2003 Chevy Silverado with the 4 speed electronic shifting transmission. ... 2021 Chevrolet Silverado 1500 For Sale. 547 ..., Nov 27, 2018 · I have had my 2018 Silverado LT Crew Cab Z71 for about two months. It has the 6 speed automatic transmission. It hesitates, lags, wanders and is woefully indecisive when shifting particularly at speeds under 55mph. I travel mostly during rush hour and there is a lot of stop and go driving so I have noticed this transmission issue at those times ... , Aug 17, 2021 ... ... Silverado, 6 cylinder, 3.23 rear gears, and a 6 speed transmission. 5th gear in my transmission is the same ratio as 8th gear in the 10 speed., There are many different signs of transmission problems, all of which are important to be aware of — a defective transmission can put the car’s driver and passengers at risk of getting into a car accident. Some of the most common transmission problems GM drivers reported include: Illuminated check engine light. Loss of power. …, Install Transmission Thermal Bypass Valve (TBV) For Any Repair Including CCND That Does Not Require Removal of the Transmission 0.6 hr *This is a unique Labor Operation for Bulletin use only. Version 4 Modified Released September 24, 2021 Revised October 05, 2021 - Removed Escalade Models, 2014 from Suburban, Tahoe and, 2020-2022 2500HD Transmission Fluid Check Procedure.pdf. 190.1 KB Views: 286. 2020-2022 2500HD Transmission Fluid Change-fill Procedure.pdf. 697.7 KB Views: 130. 2500HD Transmission Fastener Spec and Bolt Sequence.pdf. 3.9 MB Views: 108. 2500HD Transmission Fluid Capacities.pdf., Transmission issue 2021 Duramax. rjmttps; Mar 14, 2022; 12 4K Mar 15, 2022. by rjmttps. J. Speed. johnmicheal10031; Nov 14, 2021; 1 681 ... 10-Speed Automatic Transmission. 258 posts 98.5K views 10L90, 10L1000 transmissions Show Less . Join Community Grow Your Business. Forum Staff View All ..., Chevrolet Silverado (double cab, crew cab) 6.2L V8 L86 NA: Chevrolet Tahoe: 5.3L V8 Vortec NA: ... TSB Seems To Fix 8-Speed Automatic GM Transmission ProblemsAugust 13, 2019;, You need to flush the fluid more regularly. There's a gm guy on tik tok that is a gm trans wiz and always has 2015+ trucks / subs with toasted trans between 70k to.105k miles. My wifes 2018 denai 6.2 10 speed has no dip stick. Our Silverado and Sub, both 6-speeds, are pretty rock solid at 190 degrees for tranny temps., Oct 19, 2021 · 12. Points. 3. Aug 21, 2022. #13. My 2020 5.3l 10 speed Trail Boss is going in the shop tomorrow. Noticeable whine from the engine/transmission. No warning lights or hard shifting, just a whine. Dealer/service rep. said it is the 10 speed transmission, just from listening to it. , How is driving the 2020 Chevy Silverado 1500? Their 2020 Chevy Silverado 1500 is equipped with the 5.3-liter V8 engine. It’s the more popular option even though the 6.2-liter engine with 420 hp is available. The 5.3-liter engine has 355 hp and 383 lb-ft of torque and is paired with a 10-speed automatic transmission., Some of the most common Allison transmission codes include 22 for issues with engine and turbine speed sensors, 14 for issues with oil level sensors, and 65 when the engine rating ..., 2016 Silverado 6 speed transmission will not engage/go into gear. edwardk; Mar 24, 2024; 13 ... Jun 17, 2021; 5 2K Mar 28, 2024. by ... 6-Speed Automatic Transmission. 3.6K posts 1.4M views 6L80, 6L90 transmissions Show Less ..., Jan 19, 2022 · There may be several shudder concerns while driving on some 2020-2021 Silverado, Tahoe, Suburban, Sierra, Yukon and Escalade models that may be mistaken as a transmission-related concern. If the concern is on a vehicle equipped with the 4.3L V6 engine (RPO LV3), 5.3L V8 engine (RPO L82, L84, or 6.2L V8 engine (RPO L87), it may be related to the ... , 2021 2500HD Transmission Problem. My father in law has a 2021 GMC with around 5,000 miles. Empty and loaded the transmission is hard up and down shifting. It’s been doing it since new. It doesn’t always do it but …, Take a long breath: Here’s how it all breaks down. The base engine in the Silverado is a 4.3-liter V6 that makes 285 horsepower and 305 lb-ft of torque. It is connected to a 6-speed automatic transmission. Rear-wheel-drive (RWD) models earn an estimated 16 mpg city/21 mpg highway and 17 mpg combined., A: Known as a less-than-reliable unit, the 10 Speed Allison 10L1000 transmission is a fertile breeding ground for a variety of problems. This includes but is not limited to: Valve body crossleakage, burnt clutches, damaged clutch hubs, stripped shells and much more., 1. Ratio Distance. The span between the 1 st and 10 th gear is wide; however, GM and Ford’s 10-speed transmission is relatively tight. Limited span between higher gears increases sustainability during highway driving, especially when in the final gear. The 10-speed transmission offers a 20% decrease in RPM during shifting.