Transmission woes

[finston]

Sorry to most likely rehash a sore subject. Has anyone successfully done the TSB 18-NA-355 on their 2015 8 speed transmission? I'm ready to do anything to get this truck to shift like it should. I'm at 90k miles so no warranty.

What would dealer charge to complete this?

 

[OR VietVet]

Reach out to Rockola1971 about this and he can likely help walk you thru this. He knows transmissions. Wish I did.

I looked thru the TSB and it looks like a complicated version of a trans flush. Have you thought of just attempting a regular trans fluid flush to see if that takes care of it?

 

[finston]

Thanks @PNW VietVet

Hi, @rockola1971 do you have any experience with the issues of 8 speeds on '15 yukons? Thank you for any info.

 

[finston]

I also just realized I posted this in the wrong spot. Should be 2015. Sorry about that, if any admin can move it thank you.