Cj8 Vibration problem - help!
Momojeep
Jeeper
- Posts
- 2
- Thanks
- 0
- Location
- Seattle, WA
- Vehicle(s)
- 75/79 CJ5 - 304,T150,Dana20,Dana44&30. (sold)
92Wrangler - stock (Sold)
83 CJ8 - 258w/4.0LheadMPI, AX-15 w/hydraulic clutch, D300 twin stick, AMC20 1pc axles & dana30 (3.31), 265/75R16 Duratracs on 16" steel wheels. Hardtop.
OK, so I'm trying to track down this annoying weird vibration problem. here's the deal:
-The original T-5 Transmission suddenly seized up on the freeway one day. I figured this must have been the problem. Replaced it with an AX-15. But the vibration still happens.
-It comes and goes. It usually happens when I drive over a bump, then goes away. It doesn't seem to matter if I'm in gear or not.
-It's a fast vibration like driving over a washboard. It rumbles and I can feel it in my seat. I do NOT feel it in the steering wheel/pedals/front end.
-Replaced the yoke/output shaft from the Dana 300 because a U-joint bearing cap was spinning a bit.
-Had rear driveline rebuilt and balanced, new U-joints.
-Got brand new wheels and tires.
-Still vibrates occasionally for short periods of time, then goes away, usually when I change speed.
-I noticed about .015" of play between the Ujoint retention tabs in the rear diff yoke. Could this be the problem, or part of it? (I did replace the Ujoint mount straps with new ones).
-I noticed the front output shaft from the Dana 300 has some play, and the front driveline is not straight (I can see it wobbling when in 4wd with the hubs disengaged). Could this be turning a bit when I'm driving even in 2wd causing a vibration? I used plastic twist ties to hold it still to see if the vibe goes still happens when I know the front driveline is not turning.
-I noticed my front wheel bearings have a little play.
- One of my engine mounts is not aligned well, and the rubber block is tweaked pretty good to make up for the misalignment, but seems to hold well.
Any thoughts?
-The original T-5 Transmission suddenly seized up on the freeway one day. I figured this must have been the problem. Replaced it with an AX-15. But the vibration still happens.
-It comes and goes. It usually happens when I drive over a bump, then goes away. It doesn't seem to matter if I'm in gear or not.
-It's a fast vibration like driving over a washboard. It rumbles and I can feel it in my seat. I do NOT feel it in the steering wheel/pedals/front end.
-Replaced the yoke/output shaft from the Dana 300 because a U-joint bearing cap was spinning a bit.
-Had rear driveline rebuilt and balanced, new U-joints.
-Got brand new wheels and tires.
-Still vibrates occasionally for short periods of time, then goes away, usually when I change speed.
-I noticed about .015" of play between the Ujoint retention tabs in the rear diff yoke. Could this be the problem, or part of it? (I did replace the Ujoint mount straps with new ones).
-I noticed the front output shaft from the Dana 300 has some play, and the front driveline is not straight (I can see it wobbling when in 4wd with the hubs disengaged). Could this be turning a bit when I'm driving even in 2wd causing a vibration? I used plastic twist ties to hold it still to see if the vibe goes still happens when I know the front driveline is not turning.
-I noticed my front wheel bearings have a little play.
- One of my engine mounts is not aligned well, and the rubber block is tweaked pretty good to make up for the misalignment, but seems to hold well.
Any thoughts?