Installed a lift kit & have a funny vibration

[MrQuadrasteer]

A bud and I installed a 3" lift kit on his 03 1/2t 2wd Quadrasteer. 3" lift spindles up front, tapered 2.5" blocks in back. Blocks have dowel pins to locate them in the factory position.

 

Now, at 10~16mph, only in first gear, he has a mild vibration.

 

After a little poking around, he found his carrier bearing (two piece driveshaft) has moved.

 

Couple questions:

 

- is the carrier bearing pre-loaded somehow ?? How do you know when you have it located properly ??

 

-when setting pinion angle, with a carrier, should you set the pinion STRAIGHT with the driveshaft, or do you have to match the degree of drop ?? Example- if the driveshaft drops 3* at the carrier, should the driveshaft have a 3* rise at the pinion ??

 

-if the pinion angle is off and causing the vibes, since everything is dowel'ed... how the heck to you adjust it ?!!? Shims ??

 

 

I went by the 4WD Warehouse friday after work and asked for a little guidance. Those counter guys were so clueless, it was scary

 

So now, he has this mild vibe, the carrier isn't where it used to be, but we never touched it during the install....

 

 

 

Any help would be appreciated

[MrQuadrasteer]

Anybody ???

[Yardstick]

I've been wondering about this too, but I'm only going 2" in the rear of a 2WD, so maybe it doesn't matter as much for mine. I know with some lifts you're supposed to shim the center (carrier) bearing. I wonder if your friend's truck might just have a bad u-joint that can't cope with the new driveline angles from the lift.