yossarian19
NAXJA Forum User
- Location
- Grass Valley, CA
Ok. So, I've had my xj a few years and now that i'm finally fixing all the big things, some smaller things are getting more attention.
First, I should say that it has ZJ rear disc brakes on a 8.25 corporate axle. 4.0, aw4, 231, D30 / 8.25.
The first noise is a clunk when I let off the brakes. Hitting them, no noise. Hitting them gently, no noise. Braking hard, holding, then letting off will produce a clunk from somewhere in the rear end. If I slowly release pressure from the brakes before the vehicle stops, it won't clunk. Has to be bound up all at once & released before any noise. All I can think is trans / engine mounts. Any ideas?
Second, under load it will sometimes make a rattling sound, like a roulette wheel. I run 87 octane. It could be winter gas pinging, conceivably, but my untrained ear thinks it is more likely to be u-joints or...? Common under-load-only noises include what, exactly?
I can get Mopar motor & trans mounts for 150 total through work but really don't want to do it - unless it seems the most likely cause of these noises.
It is stock suspension now but ran it for a long time with a tcase drop.
First, I should say that it has ZJ rear disc brakes on a 8.25 corporate axle. 4.0, aw4, 231, D30 / 8.25.
The first noise is a clunk when I let off the brakes. Hitting them, no noise. Hitting them gently, no noise. Braking hard, holding, then letting off will produce a clunk from somewhere in the rear end. If I slowly release pressure from the brakes before the vehicle stops, it won't clunk. Has to be bound up all at once & released before any noise. All I can think is trans / engine mounts. Any ideas?
Second, under load it will sometimes make a rattling sound, like a roulette wheel. I run 87 octane. It could be winter gas pinging, conceivably, but my untrained ear thinks it is more likely to be u-joints or...? Common under-load-only noises include what, exactly?
I can get Mopar motor & trans mounts for 150 total through work but really don't want to do it - unless it seems the most likely cause of these noises.
It is stock suspension now but ran it for a long time with a tcase drop.