Ridetech 4-link pinion snubber?

[Wall]

Anyone running a pinion snubber with their ridetech 4-link in a 1st Gen F-body?

I have a 67 Firebird with Ridetech air ride setup and 4-link. When I put it in reverse and back up (at ride height) there is a clunking sound like the rear end is rotating up and either causing the u-joint to bind or just hitting the tunnel.

I'm just thinking maybe a pinion snubber might keep this from happening but not sure if there's enough clearance for one.

I did check pinion angle and set it per the specs before I welded the brackets on the rear end housing so I think the pinion angle should be ok. I haven't noticed any driveshaft vibration at any speeds, I've had it up to about 70mph on the highway so far.

Ride height is not extremely low. Pics below show the car at the lowest setting, aired all the way down. Don't have a pic at ride height yet.

[dhutton]

Pinion does not rotate with a four link. That’s a leaf spring phenomena.

Don

[Wall]

Yeah I didn't think about the rear end not being able to rotate because of the 4-link but not sure what the issue is.

[dhutton]

Yeah I didn't think about the rear end not being able to rotate because of the 4-link but not sure what the issue is.

Measure your driveline angles. Check for a bad u-joint.

[Wall]

Measure your driveline angles. Check for a bad u-joint.

Yeah definitely going to do that when I get a chance. Was just putting this out there to see if anyone else had similar issues.

The U-joint is new and haven't noticed any vibration at highway speeds but still going to check. May mount a GoPro under the car to see what's going on and look for witness marks.

[dontlifttoshift]

Is it one clunk when you put it in reverse or a bunch of clunking while backing up?

[Wall]

Is it one clunk when you put it in reverse or a bunch of clunking while backing up?

A bunch of clunking. Not extremely harsh but it's there. One thing I need to do is air up the suspension above ride height and see if it still does it.

[dhutton]

I’m going to guess your pinion is sitting higher than the transmission at ride height….

Don