I just installed a 6 inch Rough Country suspension lift. After i installed it i have a fast vibration when im driving above 50 mph. I didnt know if i need to purchase the drive shaft space becasue of the extra angle or new universal joints for the driveshaft. Has anyone else ran into this problem?

 

You may need to wedge shim the rear end at the spring mounts.

 

Check your u-joints for wear. Lifts are hard on u-joints and if you had a bad one to start with, it's just going to become more apparent.

 

These trucks are extremely sensitive to driveline angle. The lift has probably jacked your pinion angle all up. I'd start there.

 

Quintin- I realize that's true, but why is it? I have had a lot of trucks in my life and have never had one that was affected by driveline angle differences (as in heavy load or pulling trailer).

 

Post pics of your angles and how much the driveshaft is pulled out. That would help a little

 

I think it has something to do with the two piece driveshafts some of these trucks have. Trucks with one piece driveshafts aren't nearly as picky as ones with two piece driveshafts.

I only say this as a dude who's installed a few sets of lowering shackles; the trucks with two piece driveshafts always needed pinion shims, the trucks with one piece driveshafts were good to go.

 

That's why the Trail Master 6" lift kits include a CV shaft.

http://www.central4wd.com/inventoryd...folder%7C98364

 

Did you grind down the master-key and align the slipyokes on and/or re-balance the front driveshaft? You need to do that.