Chiropaul

iTrader: (2)

I have a 67' Tempest that I performed an LS1/TH400 swap into, the car runs excellent, but a few months ago I swapped in a new rear end with 3.73's and an Eaton Posi unit. I had to change u-joints on the rear end side because of the type of yoke on the rear end. We also put in new boxed upper and lower control arms, Eibach lowering springs and new KYB shocks when I did the rear end install.

Ever since I did the install I've had a driveline vibration that kicks in about 40+mph. Before I dive into finding the cause I wanted to pick everyone's brain as to the most likely cause so I can zero in on the issue.

My #1 thought is pinion angle on rear end is the issue. THOUGHTS???

Chiropaul

iTrader: (2)

In this video you can hear the vibration as I slow down

bczee

iTrader: (12)

Yeah, I would zero in on both the trans and rear pinon angles to see where you are. Might also have the drive shaft checked or re-balanced.

I had some vibration lately at around 75mph. I have the u-joints replaced and shaft balanced. The shop said it was pretty far out and after, most of the vibration was gone

Might also check the wheel/tires to see if the check out to be balanced OK.

BC

Chiropaul

iTrader: (2)

Wheels and tires are new and I forgot to add that I'm running a bigger drag radial out back now as well that was not there before the rear end swap. I'll snag an angle finder on my way home from work and see where its at. Thanks for the tip.