Guys,

This afternoon I went to gently merge into a road when I heard Bang noise, the car seemed to move up and down as though I had a foot long flat spot in my rear tires or had driven over a log.

Well I figured the tranny bit the dust and nursed it into the safe road 50 yards away. Every few feet, same distance always, it went through this bang noise/shudder, then back to normal.

I looked underneath nothing hanging down.

While waiting I thought about this. Turned her on and did some tests.

Car shifts into all gears normally (can feel the weight shift).

In gear, when I let off the brake enough to start moving, all is OK for what feels like 10 or 15 feet, then clang (from rear) and car shudders while it hits that "flat spot".

I asked Ann to get in driver's seat so I can watch from the side. She did same thing, put in gear, let off brake, car starts moving. I watched from passenger side. After the 10 or 15 feet, Bang noise, But I saw the right rear tire move forward then back to position while this racket occured.

It is like this noise occurs during some part's postion in its rotation. Nothing is hanging down. The noise is from the rear end area. Transmission does not slip at all.

As I sat waiting for the tow truck I called jag repair place #1. They responded "do you want a new tranny or a rebuilt?" I asked can't you fix it? They said "no, parts are not avialable we just replace now."

I chose to send her to another shop. Anyone ever heard of something like this? Is there some kind of joint back there that could have failed?

Well I'll appreciate any input. thank you. Hope I get lucky and it is not the transmission, but it's out of my hands now. . .

Thanks for any experience/thoughts you can share,
John

 

I think a half shaft universal failed. Don't let anyone tell you it's the transmission until all the driveshaft and half shaft connections have been checked.

 

RJ, That would be real nice. Fingers ccrossed, thank you. John

 

Agree with RJ. The only thing that had me wondering was that the wheels complete a rotation about every 6 feet or so rather than 15.

There's nothing else from the diff forward that revolves anywhere near that slowly, and with that lateral wheel movement...

Think you need a car lift before calling in the Zeppelin engineers

Good luck,
Mike

 

Thanks Mike. 6 feet could be true I was just estimating under pressure. I bet if I'd have brought it to the wrong Mechanic, I'd surely hear "new transmission needed".

Hopefully the good news I follow up with will help others in the future. I'll keep you posted.

 

Sounds to me like the limited slip differential has problems. If nothing is partially hanging down like a half shaft, that's the only thing that could affect the drive wheels like you described.

 

No Jaguar from 1997 ONWARD has an OEM limited slip diff.

bob

 

I stand corrected. Good to know
Thanks

 

Wow that's the first time the fact we don't have LSD makes me happy.