2003 1500hd 6 inch fatech vibration

teaklejr · January 23, 2004

I just installed a 6 inch fabtech lift on my 2003 1500hd. I am running 315/70r17 bfg's. When i accelerate vfrom a stop i get a shutter. It goes away after i get going but don't know why it is there. Any help would be great.

tmf6902 · January 23, 2004

Make sure your drive shaft is at the correct angle. I assume you got an alignment and your tires balanced? Are you sure it's just not the tires? Are they AT's or MT's....if you have big lugs your gonna shake a little at really slow speeds.

teaklejr · January 24, 2004

They are bfg all terrains. It's not really a vibration. It is a shudder like the whole truck shakes but just for about 2 seconds and then goes away. One thing i am going to try is to lower the center support bearing a little more to try to get the driveline straighter. Any suggegtions would be great.

kylant · January 25, 2004

do you have a 2 piece rear driveshaft? if so, that is your problem. you need to drop that bearing. the fabtech kit comes with a bracket for this.

if you do not have a 2 piece driveshaft, i have no suggestions for you.

both my 6 and 8" fabtech kits have been smooth with out any vibrations

good luck

GM GIMP · January 26, 2004

Either 2 or 1 pc. drive shaft you need to have the pinion angle correct.

I think most companies that sell lift kits also have shims for this problem.

1BADHD · January 26, 2004

I agree. Its the driveshaft!

silverado3500 · February 8, 2004

Could be axle wrap, my lifted 3500 has it mildly, but not enough to bother me. If you have a 2 piece driveshaft, it could very well be the launch shudder that has been mentioned before on this forum. If my memory serves me, some dealers were replacing the 2 piece with a one piece under warranty.