Cj5 1974 Rear End Vibrations

Maybe there are shims installed that could be removed from the spring pads. My T/C is down 6 degrees and I installed 2 degree shims to the springs to get my pinion up at 5 degrees. Under acceleration the pinion will tip upwards. Under hard acceleration I can feel a slight vibration.

 

How can I see if my jeep is stock? Why pinion and Transfer case angles are not matching if (I believe) it had no lift?
Thanks

 

Post some photos of the rear spring perches, drive shaft and yokes so we can see the angles. Photo of the side of the Jeep and arc of the springs would also be helpful.

 

Here are pics of the suspension. The measuring tape pic shows the tire's diameter. Don't think there was a lift on that one. Still don't know why the rear axle is pointing so much upward? Bought 6 degrees shims from amazon. Will lower the rear axle nose on saturday and go for a ride go see.

 

with the front shackle reversal id guess some kind of lift springs shim the rear to better match the angles and run it.

 

It's hard to tell by the photos, but with the shackle reversal, the front of the jeep might be higher than the rear. Put your angle finder on the frame to determine if the jeep is level. The springs look stock because there isn't much arc. The pinion doesn't look 10* up in relation to the springs. It doesn't look like the spring perches are moved. It is hard to believe the pinion is pointing up that far. Could you send some photos of of the relationship between the pinion and the transfer case withe the driveshaft installed.
By the way very nice looking Jeep.

 

I should clarify about finding the angle of the Jeep, maybe the front of the jeep is up 5* so the pinion is only up 5. The transfer case could be adjusted to match the pinion. Does that make sense?

 

Yes as long as the driveshaft angle is corrected shouldn’t matter which end you adjust to do that.

 

I have a 2" rear lift, but I had vibration issues before the lift, they started when I installed my T-18, my final solution was a Tom Woods CV drive shaft and 6 deg rear axle shim.
No vibration for the last 20 years.

 

Vibrations are now Gone.

Read carefully the Tom Woods Drive Shaft website, got 6 degrees wedges and longer U-Bolts and then....No more Vibration.

Conclusion. The Transfer Case Output and R ear axle input must be parallels to each other to avoid crazy vibes.

Happy camper I am.

YH

 

Did You use Your Stock Drive Shaft ?

 

Yes, Everything looks stock on this jeep but the more I work on it, I think it is possible that different parts were brought in over the years. I need to be really careful when buying parts online because they sometimes do not fit this Jeep. I had issues with alternator and Power Steering pumps that were like those of 1976 and 1980 CJ5. The listed 1974 parts just did not fit. Just don't know what happened but it the Rear Axle case, the angles were wrong (without any lift.) Kept the same Driving Shaft, and brought the Rear Axle nose down and...Bingo!