orvnoob

I have an '01 automatic trans with a 3.5" lift and SYE, no t-case drop. Just swapped the front driveshaft with one from Adams and the rear is also an Adams. Also just had the gears swapped front and rear. All done by a trusted shop.

I've been having this vibration when I let off the gas pedal. It seems to get worse as speeds increase. I pulled my rear driveshaft and found the rear U-Joint needed replaced. Did that. The U-Joints int he double cardan feel smooth and there isn't any play.

I've also got this odd rotational noise that isn't coming from either of the axles. It seems to have started after the new front drive shaft was installed. It starts around 15 mph.

So, I'm wondering if I should go ahead and replace the other two u-joints in the rear? Also, any ideas on what could be causing that noise?

Sirsyc0

Has the pinion angle in the rear been corrected since the sye and drive shaft install?

orvnoob

Yes. It's running on 2* shims on the rear axle. Driveline angles look good. Front axle angles were adjusted when the new shaft went it.

Also the shop made adjustments when they swapped the ring and pinion for me a couple months ago