I have a crew cab short bed with a 4" lift. When pulling out my truck vibrates. My understanding is that I can shim my carrier bearing but I don't know how thick. Anyone know?

 

I dropped mine about 3/4 inch. Rough country sells a lowering bracket for it tho. As for your vibrating, check the u-joints in the drive shaft and check the actual carrier bearing itself. Mine wore itself almost to pieces causing quite a vibration.

 

Every 4"'s of lift ,I heard you have to drop the carrier by 1/4" ! Just my .02 cents worth

 

Anyone Know the answer to this question ???? I've had my driveshaft rebuilt about 6 months ago and just today have replaced my very rear u-joint. 6 months on a new u-joint isn't a great life span. When towing my excavator and going up a pretty good hill it vibrates pretty good and always has done so ! Today I dropped my carrier bearing 1/4" and it still vibrates. Do I need to drop it more to get rid of this vibration ???

 

Could be alot of things. Have you checked your carrier bearing?

 

Carrier bearing is new as of 6 months ago.. While towing a heavy load it has done this since I can remember. Feels like axle rap.

 

The Bracket is only $35 from Rough Country
Ford Suspension Lift

 

I was told by a 4x4 shop that on my truck with 4" of lift, I'd need 3/4" to an inch. I was looking at the drive line and I'd probably just shim it until the drive line was either straight within itself, or the angle between the shaft and the axle yoke was a small as possible.

 

I had an AWFUL vibration/hum when i hit anything over 55. I was not very familiar with the truck at the time and had not found this forum. Sadly, I and got took to the cleaners. They rebuilt the driveshaft (keeping the factory split shaft - ugh), as well as the rear diff (the slip yoke had not been greased and had torqued the driveshaft into the rear diff).

After all that I still had the vibration/hum.

I was able to finally resolve it by shimming the carrier bearing with the kit that Pro Comp sells. If you have the factory split shaft it's not so much knowing how much to drop for each inch of lift. You need to set a goal of making the split shaft as straight as possible coming from the tranny to the rear diff.

When I got the shaft straight, my problems disappeared.

Good luck man, I know how frustrating it is.

 

Thanks for the great info... I'll try to make mine straight and see if it goes away !

Russ

 

After alot of shimming, my vibration went away after 1.25" of drop for my 4" inches of lift.

 

I think rule of thumb is 1/4" shim per each 1" of lift

 

RussB I had the same problem with my 2011 6.7 super duty with a 4" lift. I had stretched the U bolts in the rearend from pulling heavy trailers and was getting axle wrap and movement. I ended up putting traction bars on it and solved the problem