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-   -   03 Sierra Denali clunky shifting (https://www.performancetrucks.net/forums/gm-drivetrain-suspension-22/03-sierra-denali-clunky-shifting-531009/)

rockoosi1 07-25-2014 03:06 PM
03 Sierra Denali clunky shifting
 
I recently purchased the truck and I've noticed that under light throttle it's very clunky/jerky when it shifts gears. The funny thing is, when I give it a little more throttle or I'm in tow mode pulling my car trailer (maybe more throttle is being applied as well) it seems to shift normally. Does this sound like a transmission tuning issue? Or something else? Thanks!

FFDP 07-25-2014 08:29 PM
Does it make a clunk when you shift from drive to reverse or the other way around??

Perhaps a bad u-joint if that is the case. Just throwing an idea out there.

rockoosi1 07-26-2014 05:31 AM
Originally Posted by FFDP (Post 5232445)
Does it make a clunk when you shift from drive to reverse or the other way around??

Perhaps a bad u-joint if that is the case. Just throwing an idea out there.
Nope it only happens during light throttle shifts.

03sierraslt 07-26-2014 06:55 AM
Does it do it in all gears or just 1-2?

terravast4 07-26-2014 01:29 PM
do you have a p1870 code?

rockoosi1 07-28-2014 10:06 AM
Originally Posted by terravast4 (Post 5232501)
do you have a p1870 code?
CEL isn't currently on. I have'nt looked to see if there are any codes stored though.


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