Little hell can't figure out what is going on with my car from 35 to 40 miles an hour most recent on deceleration I get a roaring sound like it might be wheel bearing related U-joint related or something of that nature . All seem tight and correct any help would be great .

 

I would suspect your differential pinion bearings, but on our '93 they sounded more like a jet engine whine than a roar. But only on deceleration at moderate speeds as you describe. Look for oil leakage from the pinion seal - that's often a clue that the bearings have developed play.

It would be worth greasing your U-joints just as good maintenance.

A wheel bearing will usually roar all the time, not just while decelerating, and it may change sound while cornering.

If you have a local shop with the Chassis Ear system, they can strap microphones near various driveline components and listen while driving, which can often help narrow down the area from which the noise is emanating.

Cheers,

Don

 

Appreciate it Don!!
when holding the drive shaft and rotating back and forth should there be any clicking sound at all or any play at that joint?

 

You will get a slight click in each direction as the pinion gear rotates through the backlash clearance and its teeth make contact with the teeth of the crown gear, but the driveshaft should not rotate very much between these two contact points. From memory, the backlash spec is in the range of 0.004" to 0.008", which is just enough to be detectable by feel.

If you get a loud click like something is shifting, or if oil is leaking from the pinion seal where the driveshaft meets the differential, then suspect your bearings are shot.

It would be worth checking the level of the differential oil while you have the car up on jackstands or ramps. Your roar could be the diff gears running dry and hot.

Cheers,

Don

 

Thanks Don yeah that's what I get just a little click going each Direction not much play it all. So it better not be the differential I had Johns cars in Dallas do a swap on that last year because mine was shot. But that noise was totally different and it was constant no the differential is full clean no shavings. Man I am stumped . Think I'm going to have to put a recorder on it somehow different locations and see if I can pinpoint it very strange just at 35 to 40 miles an hour otherwise smooth as a kitten thanks again I'll definitely let you know. It's about got me beat don't have to know if you can go with a 18 or a 19in wheel on these xj40 do you?

 

Well I've done everything I can think of except have the car into the shop for audio work to try to discern whether this is a bearing noise or otherwise very strange at only 35 to 40 miles an hour on acceleration rarely usually on deceleration .
will update as appropriate.

 

Hi wsv32451,

I have merged your new post with your existing thread so all the information pertaining to your issue is contained in the same thread. This helps avoid confusion, duplicate posts from members responding to two threads instead of one, etc.

Cheers,

Don