bad vibration

[hpjunke]

ok so i took out my challenger yesterday and noticed it had a pretty bad vibration at around 60 mph it had it before but was no where near as bad so i was really thinking the u joints are going away its only on acceleration and its lowered and ich in a half in the rear so i know the pinion angle is off , off enough where if i get on it and it hooks the driveshaft rubs the bottom of the car .. what do you guys think ? i never changed the u joints since its been back on the road..
any ideas guys?

 

[mopar70]

I got the same issue at 70 80 mph really loud vibration. I ended up breaking my rear u joint and the drive shaft fell out lucky I was turning left and not going to fast. I have replaced it but have not driven the car since its off the road until summer and upgrading the suspension and brakes.

 

[moparleo]

Send the shaft out to a driveline shop. Have them check for straightness( bent shaft) install correct u-joints and balance.
If you still have a vibration, it will be easier to pinpoint.

 

[Chryco Psycho]

2 problems for sure ,
1- the pinion angle is set too high , it should be 5* down from the driveshaft angle
2 the front section of the springs is too soft , add 1/2 leafs & a square top U bolt to stiffen the front section so the pinion cannot climb

 

[hpjunke]

Chryco it's #1 pinion is to high .. Car is lowered

 

[Chryco Psycho]

Cool so you need some angled shims available from most 4x4 shops , aim for 5* nose down & the vib should go away