I have coil overs and delrin bushings on my rear IRS. The coil overs are from griggs and the threaded sleeves and inside of the springs look like they interfere quit a bit. Also, the rear delrin bushing on the lower a-frames are gouged out from friction with something I've not determined yet...
I'm putting a new diff into my IRS cobra rear end. Part of the reason was a healthy bunch of noises from the old diff setup. Upon dismantling I checked backlash, pinion pre-load, and pinion depth. The backlash was fine although the carrier pre-load was very tight (I had to use a great deal of...