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Need some help! Have vibration/shimmy in rear. Feels like it's in the a$$ of your seat. It's a 2006 GMC Sierra 1500 ecsb. Lifted 6in has rough country anti axle wrap blocks in rear and 1 1/2" add-a-leaf. Riding on 36x15.50x20 Mickey mtz's. I've had the driveshaft checked, new transmission mount...

Need some expert help on what cam to go with! I have a 2006 GMC Sierra 6.0 lq9 with the 4l70e tranny and 4.10 gears. Only mods so far are shorty headers, cold air intake, magnaflow dual exhaust cats still on, and superchips which will be swapped for a custom tune thru hptuners. I'm looking for a...

3 2006 sierra vortecmax..

2006 sierra vortecmax

2006 sierra vortecmax 2006 sierra vortecmax

Alright I have a 2006 gmc sierra running 20x14 fuels on 35x13.50 fuel mud grippers, and I'm getting a bad vibration/shimmy at 45mph and 65+. I've had them balanced and there good, and I've had the truck aligned 3 times. I have completely replaced the entire front end and the ujoints in the...