Lyman24

It appears GMC Service Bulletin 16-NA-175 for the transmission shake / shimmy / rumble / shudder is only for the 8 speed transmissions. I have the 6-speed. Does anyone have experience with the 6-speed? Does the tranny flush help?

Mine just started... There is a GM Service Bulletin on how the dealers are suppose diagnose/trouble shoot the issues. Several fixes, just depends on what vibration is occurring. I did do a search on "rumble" on the thread and some lucky persons corrected the issue with transmission flush. Still doing research...

Add me to the list. Right before Hurricane Irma the A/C starting getting warm and struggling. Not ideal in Florida late August / early September. I'm a few hundred miles over warranty. I didn't read this thread or know of the issue prior to taking it to GMC dealer yesterday. They called back after diagnose and are going to cover half of the repair. They know it's a known issue, but getting it done for ~$400. Sounds like I'm covering the labor to install. Should have it back later today.

I don't have mine yet, but did you select a specific tune for yours?

I have FabTech 6" lift too, with the same issue. Turns like a tractor-trailer, lots of 3-point turns.

Ordered an Extang Solid Fold 2.0 today. Will report back.

Purchased a Diablo, be here in a few days. Hopefully do the trick for this rooky. Couldn't see spending the $600 beans, maybe down the road turn to BB.

Jlm02a3094 - Did you upgrade to tow mirrors or did they come from factory? Just curios. My truck came with regular, been thinking of upgrading to tow... BTW nice looking rig!

New to the forum, finding my way around. Looks like a good spot for introduction! Lots of good info here! Just want to introduce my lady!