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Chevy Silverado and GMC Sierra Transmission Problems

1486 messages,  Last post on May 13, 2013 at 11:26 AM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck

    
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Messages Page 93 of 149

#916 of 1486 Re: 2009 gmc 1500 4x4 shift problem [excellentnurse] by chuck1919

Jul 07, 2011 (8:13 pm)

Replying to: excellentnurse (Jul 03, 2011 5:29 am)
2007-2010 GMC Sierra (New Body Style) with Single-Piece Propshafts
 
All Equipped with 4L60 Automatic Transmission (RPO M30) and 2WD
 
Attention: This bulletin contains a procedure to clean/lubricate the slip yoke splines and replace the slip yoke, if necessary. Check the history on this vehicle. If the lubrication procedure has been performed previously, then continue on and replace the slip yoke.
 
Condition:
Some customers may comment that the vehicle has a bump feel or a clunk noise at a stop or on launch. Customers may also comment that the bump feel or clunk is noticed after the vehicle has come to a complete stop and that it feels as if the vehicle was bumped from behind.
 
Cause:
This condition may be caused by a slip/stick condition in the interface between the rear propshaft slip yoke and the transmission output shaft splines. Braking to a complete stop can force the propshaft slip yoke forward into the transmission while the vehicle rebounds slightly backward after stopping its momentum and create this condition.
 
Correction:
Note: A bump feel or noise may also be due to fuel movement in the fuel tank when not completely full. If the condition is eliminated after filling the fuel tank, the noise is isolated to the fuel movement in the tank. Please make no repair attempts, as this noise is considered an operating characteristic.
 
Verify the customer's concern.
 
Clean/Lubricate Slip Yoke Splines:
 
Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
Inspect the rear slip yoke splines on the drive shaft.
Clean the slip yoke splines with brake cleaner or equivalent and a shop towel.
Assure the yoke is free of rust or other foreign material.
Lubricate the slip yoke spline with grease, P/N 19257121 (in Canada, 19257122), using a brush or swab to completely cover the entire spline with a light coating of grease.
Reinstall the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
Road test the vehicle and verify that the noise is gone.
Note: Do Not replace the slip yoke unless the cleaning and lubrication procedure is ineffective.
 
If the vehicle has a repeat concern after lubricating the slip yoke splines, it may be necessary to replace the propeller shaft slip yoke with a new nickel-plated slip yoke.
Replace the Propeller Shaft Slip Yoke
 
Remove the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
Important: Some U-joints are fastened with nylon injection clips. If so, Do Not reuse the U-joint. Replace with GM P/N 12479126 U-Joint kit.
 
Replace the propeller shaft slip yoke with a new nickel-plated slip yoke. Refer to Propeller Shaft Slip Yoke Replacement in SI.
Install the rear drive shaft. Refer to One-Piece Propeller Shaft Replacement in SI.
 
Parts Information:
 
LUBRICANT - Part#19257121 (in Canada, use 19257122)
 
SLIP YOKE - Part#19121437 - 2007 & 2008 - Utilities / Tahoe / Yukon and Avalanche
 
SLIP YOKE - Part#20877209 - 2009 - Tahoe / Yukon & 2007-2010 Pickups
 
JOINT KIT,PROP SHF UNIVERSAL - Part#12479126 (in Canada, use 10952423) Replace only if fastened w/nylon injection
 
--------------------

#918 of 1486 2011 transmission shutter, stumble, hesitation by formulacc

Jul 06, 2011 (12:02 pm)

#919 of 1486 2011 transmission shutter, stumble, hesitation by formulacc

Jul 06, 2011 (12:02 pm)

** yes I know this has come up in other threads but I would like to open a new thread to this issue specifically and hopefully compile some useful information **
 
Can we please keep the vehicles relevant - 2007 and newer silverado and sierras with GM's transmission - 6l80e and 6l90e (not the allison).
 
My vehicle is a 2011 silverado 2500 6.0L with the 6L90 tranny. currently 13,000 miles.
 
Since new, this vehicle has had what I describe as a hesitation when accelerating - most noticeable just before down shifting. For example if I turn at a stop light and then re-accelerate, but not so hard as to downshift, the truck bucks and jerks for about 5 sec. or until the next shift. It is also noticeable when climbing a hill - as you roll on a little throttle the vehicle starts to buck and jerk all the way up the hill. Its not as noticeable if the truck down shifts, but it is still there a little.
 
I was convinced that his was the engine hesitating, but after going around and around with 3 different dealers - one dealer finally drove the vehicle and recorded live data. He told me that they can see the torque converter locking and unlocking repeatedly. At first the dealer told me this was not normal but since there was no check engine codes (there actually was a throttle position sensor code but it was a long time ago so that was ignored) they would need to drive a similar vehicle. Weeks go by and they finally drive another truck and their attitude changed and I was hearing the exact words that we have seen on other posts "normal operation" "transmission learning" "you must be driving on that fine line".
 
Here are a couple of things I find interesting:
 
   - The hesitation / jerking seems to get worse when the weather is hotter.
  - Since the dealer pointed me toward the torque converter, I have noticed other strange symptoms 1. every now and again it feels like it misses 2nd gear and revs or a second before coming back down (like it slips) 2. sometimes at low speeds around town I get a harsh clunk - like shifting a manual without pressing in the clutch (this only started recently).
   - the fact that there was a thottle position sensor code, because on other threads there seems to be some metion of this.
 
I am supposed to be contacted by my GM regional rep within the next day. I would like to compile other similar cases - others that have been given the "run around" and possible fixes or not.
 
thank you!

#920 of 1486 2000 Chevy Silverado by scoobydoo9

Jul 14, 2011 (1:20 pm)

I have a 2000 silverado automatic that has lost OD and first gear. Oh, and it will not shift automatically. I can start out in 2nd, shift into 3rd and reverse works. It's 4 wheel drive, does the same in 2hi, 4 hi and 4 lo. I had 3 shops tell me it's the planetary gears,,, same old story with every tranny,,,,, had 1 shop tell me it could be a solenoid valve. Any Ideas? It has 225,000 on the original tranny, and has been acting like this for over 30,000 miles.

#922 of 1486 Re: 2000 Chevy Silverado [scoobydoo9] by chuck1

Jul 14, 2011 (3:02 pm)

Replying to: scoobydoo9 (Jul 14, 2011 1:20 pm)
If 3 shops told you the same thing, it would appear that is the problem. At 225,000 miles, what do you feel the functional life of the transmission should be?

#923 of 1486 Re: 2011 transmission shutter, stumble, hesitation [formulacc] by lidarules1

Jul 15, 2011 (12:13 pm)

Replying to: formulacc (Jul 06, 2011 12:02 pm)
formulacc- I just read your post, and can totally relate to the problems you are having. I have a 2011 Silverado 1500 with a 6.2 and a 6 speed transmission. I have experienced the same tranny problems as you. In addition to those problems, when I start my truck for the first time in the morning it runs rough or chugs for about 5 or 10 seconds, until it finally idles down. The truck will also show that it is discharging sometimes when i'm driving, the volt gauge goes down to about 10 volts. These problems started at 1000 miles and the truck now has 3500 miles on it, and the problems seem to be getting worse. I have been to the dealer once so far, and they told me that I am probably not used to the 6 speed transmission, and they couldn't find the other issues . I'm not quite sure what to do next. If you could, please post what you find out from the GM rep. If I find out anything new, I will do the same. Thank You.

#924 of 1486 Re: 2011 transmission shutter, stumble, hesitation [formulacc] by kanans

Aug 18, 2011 (5:51 pm)

Replying to: formulacc (Jul 06, 2011 12:02 pm)
I have the same issues. My company finally bought me a new truck instead of letting me inherit the next oldest truck. They got me a 2011 GMC Sierra. I am a car guy, ex mechanic. It has 10K miles on it now. From day one, at stoplights I have had to look in the mirror weekly to see if I got rear ended, nope, its the **** tranny. And it always seems to hesitate excessively when letting of the gas and then hitting it. It also hesitates when I need to pull out onto a road from a dead stop. I lived with it because hey, I didn't pay for this truck my company did. I average about 100 miles a day between customers. But this morning I got a green left turn arrow so proceeded into the intersection. Halfway through I notice a typical zoned out driver to my right blew the light and I had no choice but to put it to the floor so the commuter wouldn't slam into me. Well... my high quality GM pickup decided that was a good time to exaggerate the transmission hesitation. When I put it to the floor there was a SOLID 3 COUNT before it decided what gear the slushbox tranny needed. It was annoying at first, but now its dangerous. I have never trusted american automatics, so sad that manuals are on their way out. My personal car is a manual and I will never buy an auto unless I have no choice. GM please fix this, it is a real issue! I was so excited that my boss sprung and spent the extra cash to get me a V8 4wd but sometimes I wish I had my 99 chevy silverado 2wd underpowered V6 company truck back. At least the tranny knew how to shift!!!

#925 of 1486 Re: 2011 transmission shutter, stumble, hesitation [kanans] by obyone

Jul 20, 2011 (9:46 pm)

Replying to: kanans (Aug 18, 2011 5:51 pm)
sometimes I wish I had my 99 chevy silverado 2wd underpowered V6 company truck back. At least the tranny knew how to shift!!!
 
So you're saying you would rather have the old 4L-60e vs. the new 6L-60e. The 4L-60e had it's share of problems including early torque converter lockup at around 39 mph. Perhaps a stall converter would help you out cause unless you're connected I wouldn't hold my breath on getting help on that 6L-60e.

Messages Page 93 of 149

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