6L80E Rough Shift 1-2 and 2-1

TahoeLT10 · Sep 9, 2019

Still following. I feel like my tranny is on its last leg, yet no code and when attempting to reset it does nothing; does not go through reset process.

BG1988 · Sep 9, 2019

what is the operating temperature?

BeauDuke45 · Sep 11, 2019

BG1988 said:
what is the operating temperature?

Transmission is around 170, engine is around 200 consistently.

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BeauDuke45 · Nov 22, 2019

Finally broke down and took the Tahoe to a shop. They dropped the transmission and found the previous rebuilder mid-installed a snap ring when putting it back together. New clutch disks for 2&6, and some other new and improved goodies, and the Tahoe will be back home this weekend.

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swathdiver · Mar 15, 2020

gooffeyguy said:
Did a 3-4 minute snapshot of the trans data just driving around the block. Only got up to about 35mph when I turned onto the main road from the subdivision.

I downloaded it into TIS2000 on my laptop. Guess I gotta get it posted on youtube and link it here.

In a nutshell, most of the solenoid pressures stayed at 109, but would start out less then ramp up real quickly.

Was helping to diagnose a 2013 Tahoe the other day and it's transmission line pressure was also 109 psi. This one had about 120K on the clock and the fluid had not been changed yet.

@Doubeleive @avalonandl

Doubeleive · Mar 15, 2020

if I remember I will hook mine up and see what it does might be a couple days no plans to go anywhere at the moment

BeauDuke45 · Mar 15, 2020

What is the pressure supposed to be? I’ve changed my driving style somewhat to avoid the shifting problem, but sometimes still feel a lag when getting into the accelerator, like when increasing speed through a turn.

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TahoeLT10 · Jun 26, 2020

TahoeLT10 said:
Still following. I feel like my tranny is on its last leg, yet no code and when attempting to reset it does nothing; does not go through reset process.

Coming back to this a year later. Still the same issues and no codes. I am starting to lean towards rear diff and not the transmission. Someone please correct me if I am wrong. I was in the back seat and felf the jerking under me, as well as clunking noise. My table was rear ended and the diff was replaced (got it from a junk yard) so perhaps it is dying. What can cause the clunking noise? The slip yoke? What about the jerking (if it is the differential)? Thanks.

Edit: Looks like putting the vehicle into front wheel drive only fixes the problem (only tested short distance). Can the issue be with the slip yoke?

Edit: Still all good with front wheel drive only. Will replace the slip yoke, ujoins and yoke pinion.

TahoeLT10 · Jul 24, 2020

TahoeLT10 said:
Coming back to this a year later. Still the same issues and no codes. I am starting to lean towards rear diff and not the transmission. Someone please correct me if I am wrong. I was in the back seat and felf the jerking under me, as well as clunking noise. My table was rear ended and the diff was replaced (got it from a junk yard) so perhaps it is dying. What can cause the clunking noise? The slip yoke? What about the jerking (if it is the differential)? Thanks.

Edit: Looks like putting the vehicle into front wheel drive only fixes the problem (only tested short distance). Can the issue be with the slip yoke?

Edit: Still all good with front wheel drive only. Will replace the slip yoke, ujoins and yoke pinion.

The problem is loose chain inside transfer case.

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6L80E Rough Shift 1-2 and 2-1

TahoeLT10

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BG1988

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BeauDuke45

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BeauDuke45

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swathdiver

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Doubeleive

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BeauDuke45

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TahoeLT10

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TahoeLT10

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