6L80E Rough Shift 1-2 and 2-1

[TahoeLT10]

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]

what is the operating temperature?

 

[BeauDuke45]

what is the operating temperature?

Transmission is around 170, engine is around 200 consistently.


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[BeauDuke45]

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]

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]

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]

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]

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]

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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