Rear End differential thunk
#21
09-02-2021, 06:17 PM
I am not sure about your model of Jaguar, but my XK8 had this issue when the car would slam into 1st gear as you approached a stop.
It caused a rear pinion shaft/gear set to be replaced.
After much searching on the internet, I came upon the real fix to solve this problem.
YOU MUST have the engine computer AND the Transmission computer RE-FLASHED at the same time and then someone must drive the car slowly for several miles.
I had this done and I have never once experienced this problem again. I think I used search on transmission thunk.
An experienced Jag dealer would know about this, but my shop's people didn't know about it until I brought in the exact procedure. They then followed the procedure to the letter and I am free of that annoying (and expensive problem).
Good luck
It caused a rear pinion shaft/gear set to be replaced.
After much searching on the internet, I came upon the real fix to solve this problem.
YOU MUST have the engine computer AND the Transmission computer RE-FLASHED at the same time and then someone must drive the car slowly for several miles.
I had this done and I have never once experienced this problem again. I think I used search on transmission thunk.
An experienced Jag dealer would know about this, but my shop's people didn't know about it until I brought in the exact procedure. They then followed the procedure to the letter and I am free of that annoying (and expensive problem).
Good luck
#22
09-02-2021, 06:30 PM
Checking for backlash is a simple process. Repairing it, is not. Usually, a U-joint will not clunk like this. The sound you describe has the earmarks of excessive backlash in the pinion gear.
About a year after picking up our 95 XJ6, we began hearing a rumble in the rear end. The rear end bearing were failing. The average DYI guy cannot rebuild a Jaguar rear-end. My background is
in automation and machine repair. My father was an auto mechanic and he used to rebuild rear-ends for a few guys that raced. It's been over 20 years since I rebuilt that XJ6 rear end, but I remember
it vividly. I had access to all sorts of equipment. You will need a 20 ton bearing press for starters. The domestic brands I'm most familiar with (Ford or GM) are easy for most guys to rebuild.
About a year after picking up our 95 XJ6, we began hearing a rumble in the rear end. The rear end bearing were failing. The average DYI guy cannot rebuild a Jaguar rear-end. My background is
in automation and machine repair. My father was an auto mechanic and he used to rebuild rear-ends for a few guys that raced. It's been over 20 years since I rebuilt that XJ6 rear end, but I remember
it vividly. I had access to all sorts of equipment. You will need a 20 ton bearing press for starters. The domestic brands I'm most familiar with (Ford or GM) are easy for most guys to rebuild.
the 14HU rear end in the XK8 is different, a total POS and not worth repairing for any reason. the pinion breaks teeth and it’s game over
the 15HU in your XJ6 is a domestic rear end, a dana44. you’re right that setup is hard and time consuming. so just let a jeep shop do it instead
Last edited by xalty; 09-02-2021 at 06:51 PM.
#23
09-02-2021, 06:34 PM
Thank you
#24
09-02-2021, 11:35 PM
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my personal favorite is Mobil 1 75w-140. It does cost more than the same brand of the 75w-90 weight, but will keep working when the lighter weight lube fails .
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