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Discussion Starter · #1 ·
I have a 3 1/2 " lift, 33" tires. slip yoke eliminator with cv driveshaft. I recently had new spring pads welded to my axle so I would not have to use shims anymore. The guys angled my pinion up toward the transfer case. It is almost straight, maybe a degree under perfect alignment. (at the axle end). When I drove away from the shop it drove great, no vibrations at any speed. Now, it is vibrating terribly around 55mph. When I cruise at constant speed or speed up it vibrates, but when I let off the gas the vibration quits. What is the deal?
any help would be appreciated.

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I've heard that both angles need to be the same on a cv driveshaft--is this true?
I've also heard when giving it gas the torque causes the axle to want to go up making the pinion alignment actually too far up and out of alignment. Should I put 2 degree shims in it to lower the pinion to compensate for this?

But, why would it start this later on and not when I first drove off??
 
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Discussion Starter · #2 ·
Did they balance your driveshaft and you lost a weight? Just a possibility.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
 
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