08' 1500 Fabtech Front End Shake

[balas217]

I have a 2008 GMC 1500 with a 6" fabtech kit. Running 35's etc.. When I put it in "auto" 4wd I get a front end shake which seems like a driveline issue. Fabtech says that maybe 4 guys have called with this problem.

 

Anyone have this issue or know what to do to fix it?

[Nytemare]

I have a 2008 GMC 1500 with a 6" fabtech kit. Running 35's etc.. When I put it in "auto" 4wd I get a front end shake which seems like a driveline issue. Fabtech says that maybe 4 guys have called with this problem.

 

Anyone have this issue or know what to do to fix it?

Did you have your PCM recalibrated for tire size....It sounds like the truck is detecting slippage and engaging the 4wd. In auto the truck should act just like a 2wd until you get slippage, so there should be no shaking in auto if there is no shaking in 4wd or 2wd.

[blackout07]

Due to the suspension lift, you shouldn't run it in auto. Leave the truck in 2wd unless you need 4wd.