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17 Denali ultimate trans shifting


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Hello. Anyone else roll into wot and have the truck fall on its face at either the 2-3 or 3-4 shift? My truck has been doing this. It’s like the ecu pulls all the power. Stock Sierra with 20000 miles. 

Edited by Boostpatrol
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5 minutes ago, Boostpatrol said:

Hello. Anyone else roll into wot and have the truck gal on its face at either the 2-3 or 3-4 shift? My truck has been doing this. It’s like the ecu pulls all the power. Stock Sierra with 20000 miles. 

Can we assume this is an 8 speed? or is it the 6 speed?

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  • 4 weeks later...

There is an ECU update that I had done to mine today that makes it run muuuucccchhhhh better. I had a hypertech tune on mine that I will not be reinstalling. They also did a fastlearn on my transmission that killed the coasting clunk too. 

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11 minutes ago, Chad2815 said:

There is an ECU update that I had done to mine today that makes it run muuuucccchhhhh better. I had a hypertech tune on mine that I will not be reinstalling. They also did a fastlearn on my transmission that killed the coasting clunk too. 

Can you share a picture of the TSB for the update?

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1 hour ago, Chad2815 said:

No I don’t, took mine in for the coasting clunk and they told me there was an ECU update that they completed and it really helped. 

No paperwork given to you?

 

Strange, but thanks for the reply. Glad to hear your truck is doing better.

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