1994 zj rear vibration when coasting or braking
Have a 94 zj limited with 318 and quadra-trac. I recently picked up a vibration coming from the rear which started out when coasting and soon could be felt when coming to a stop. I went and replaced the pads and rotors and the parking brake shoes. Pads and rotors were fine, but the parking brake shoes were completely worn down and cracked. Got everything back together and the vibration is still there. I noticed when in reverse, if I go fast enough, it will start vibrating. I checked the drive shaft and u joints for play, but everything seems tight. I don't think this is so much a drive line issue because it doesn't do it under acceleration at all. Transmission shifts fine. I haven't checked the rear differential fluid yet. Parking brake works fine, but coasting in neutral and applying the parking brake, I can feel the vibration. It doesn't have any warning lights coming on, other than the usual service 4wd switch on the lower display, but it has always done that. I am stuck at what the problem could be.