Ten Speed Transmission hard shifting

jpcortese · Aug 16, 2019

After a few thousand miles I'm finding that my 2018 Denali with the 10 speed tranny is no longer shifting smoothly. Shifts are kinda clunky and there is a slight hesitation from a standing stop. Is this a problem others have experienced? Is there a TSB on this? If so what was done to correct this. I'm thinking about taking it to the dealer and have them reprogram the tranny. Any thoughts?

PG01 · Aug 16, 2019

jpcortese said:
After a few thousand miles I'm finding that my 2018 Denali with the 10 speed tranny is no longer shifting smoothly. Shifts are kinda clunky and there is a slight hesitation from a standing stop. Is this a problem others have experienced? Is there a TSB on this? If so what was done to correct this. I'm thinking about taking it to the dealer and have them reprogram the tranny. Any thoughts?

I think there was a tsb
@GTNator @Dcmaynor

Oh and

@cardude2000

sealandsky · Aug 18, 2019

I wish I had "hard shifting", I'm getting occasional slippage in 2-3 and 3-4 shifts under medium throttle application. Works like a champ under either light or WOT conditions. Dealer shrugs...

Brad LeFevre · Aug 22, 2019

I have the eight speed and there is a TSB regarding full transmission flush and and specifically Mobil 1 fluid replacement. I've heard a few anecdotal thumbs up on getting rid of the delayed P to R clunk and the 2 to 1 clunk. I'm going in next week and having it done.

Brad LeFevre · Sep 19, 2019

Brad LeFevre said:
I have the eight speed and there is a TSB regarding full transmission flush and and specifically Mobil 1 fluid replacement. I've heard a few anecdotal thumbs up on getting rid of the delayed P to R clunk and the 2 to 1 clunk. I'm going in next week and having it done.

The Mobil fluid change smoothed the clunking for two days. Now it's right back to clunking P to R and the 2 to 1. Don't see any leaks. Back to the dealer.

Ten Speed Transmission hard shifting

jpcortese

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PG01

sealandsky

Full Access Member

Brad LeFevre

TYF Newbie

Brad LeFevre

TYF Newbie

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