Differential Noise
#41
04-10-2018, 10:04 AM
Veteran Member
Just a thought. Sometimes we forget the basics... Not sure on the 2007, however, early x100's have zerk ( grease) fittings on the rear axle universal joints. Rare is it people, service stations grease anything these days. Helped my 99 XK8. I also removed the rear behind axle mufflers for a wee bit of extra muscle sounding. I installed dynamat insulation in trunk area to remove the inherit drone from the exhaust. All well. Rich
Also per what RePalm said, laurels should translate to the gear lash being too tight which causes noise.
#42
06-28-2018, 02:46 AM
Senior Member
You know what, that's exactly what it's made of 
Fair enough, I'm not the most mechanically minded but it's not going to hurt to change the fluid, as far as I know it's not been done and the car is showing almost 93k miles. I'll have a good look first, see if there's any signs of issue with the diff or the CV joints etc.
Fair enough, I'm not the most mechanically minded but it's not going to hurt to change the fluid, as far as I know it's not been done and the car is showing almost 93k miles. I'll have a good look first, see if there's any signs of issue with the diff or the CV joints etc.
The only annoying thing was, I asked the dealer to swap the diff oil anyway while they had the car there and initially they agreed, then the excuses started... "this isn't the right oil sir" (it was) and then "the diff must be sealed for life sir, there is no drain plug so we can't change it without removing the diff"... I understand the common method is to remove the fill/level plug on the back casing and use some form of suction to remove the old oil and refill the same way, is that right?
#43
06-28-2018, 05:03 AM
Veteran Member
#44
06-28-2018, 06:25 PM
Senior Member
TBH the noise didn't sound like any failed wheel bearing I've heard before, they always seem to whine - this was more of a whirr/rumbling sound.
As for the oil, I think they just didn't want to do it and were just making excuses rather than didn't know how. I'll think carefully before using them again.
As for the oil, I think they just didn't want to do it and were just making excuses rather than didn't know how. I'll think carefully before using them again.
#45
06-29-2018, 05:58 AM
Veteran Member
The only annoying thing was, I asked the dealer to swap the diff oil anyway while they had the car there and initially they agreed, then the excuses started... "this isn't the right oil sir" (it was) and then "the diff must be sealed for life sir, there is no drain plug so we can't change it without removing the diff"... I understand the common method is to remove the fill/level plug on the back casing and use some form of suction to remove the old oil and refill the same way, is that right?
Yes it's commonly sucked out. DIY or use any competent mechanic. Avoid that place!
#46
04-24-2020, 08:55 PM
Junior Member
Hi, I'm new to this forum and not particularly mechanical. My 96 XK8 has started to make a rattling noise from the rear of the car when its cruising along with revs between 1300 and 1600. When you press the accelerator the rattle begins and continues until either the transmission changes down or the revs climb to around 2000.
Is this likely to be a differential issue? or (fingers crossed) something less sinister.
Cheers Moff
Is this likely to be a differential issue? or (fingers crossed) something less sinister.
Cheers Moff
#47
04-24-2020, 09:02 PM
Veteran Member
#49
05-06-2022, 08:04 PM
Senior Member
First of all welcome to the forum, when you get a moment stop by our new members area and say a few words 
Now, your diff.
The TSB JTB00175 is a replacement program to upgrade the troublesome diffs in the 2006-2008 cars (a Ford/Visteon unit) with the new design from GKN that was fitted to later models.
You can see an example of the work done in this thread https://www.jaguarforums.com/forum/x...ential-114897/
Basically it's a replacement diff, driveshafts and propshaft. And it costs a bomb...
The noise you hear is most likely a bad bearing, caused by a defect in the assembly of the diff by the OEM supplier.
There are several options
- go with the complete upgrade from JTB00175
- rebuild your existing diff and hope that it's gonna hold
- fit the older style diff and driveshafts from the 4.0L S-Type
You can see some info here https://www.jaguarforums.com/forum/x...ebuild-151389/ and links to some other threads discussing this topic.
I would look for a secondhand diff and driveshafts from a wrecked 4.0L S-Type if I were you. It's the same ratio 3.31:1 as your XK.
Now, your diff.
The TSB JTB00175 is a replacement program to upgrade the troublesome diffs in the 2006-2008 cars (a Ford/Visteon unit) with the new design from GKN that was fitted to later models.
You can see an example of the work done in this thread https://www.jaguarforums.com/forum/x...ential-114897/
Basically it's a replacement diff, driveshafts and propshaft. And it costs a bomb...
The noise you hear is most likely a bad bearing, caused by a defect in the assembly of the diff by the OEM supplier.
There are several options
- go with the complete upgrade from JTB00175
- rebuild your existing diff and hope that it's gonna hold
- fit the older style diff and driveshafts from the 4.0L S-Type
You can see some info here https://www.jaguarforums.com/forum/x...ebuild-151389/ and links to some other threads discussing this topic.
I would look for a secondhand diff and driveshafts from a wrecked 4.0L S-Type if I were you. It's the same ratio 3.31:1 as your XK.
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kj07xk (05-06-2022)
#50
05-06-2022, 09:18 PM
Veteran Member
No it's for the 07-09MY. I'm checking more TSB's the tI have
#51
05-08-2022, 07:19 AM
#52
05-08-2022, 09:39 AM
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Gears, clutches, bearings and seals do wear. Maintaining the system with fluid changes should benefit the system as a whole as fluid breaks down (with oxidation and heat) and there may be foreign (from wear and tear) bits suspended in the fluid.
Last edited by guy; 05-08-2022 at 09:42 AM.
#53
05-08-2022, 10:22 AM
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Hard to tell how many have/had the issue.
Certainly enough complaints for a TSB to be written. I’ve still got the howl, and suspect now that the previous owner sold the car to avoid getting it fixed. Got some upcoming road trips, so if it fails or gets too annoying during those trips, I‘ll consider getting it fixed. No amount of fluid changes will stop the wear causing the howl.
Certainly enough complaints for a TSB to be written. I’ve still got the howl, and suspect now that the previous owner sold the car to avoid getting it fixed. Got some upcoming road trips, so if it fails or gets too annoying during those trips, I‘ll consider getting it fixed. No amount of fluid changes will stop the wear causing the howl.
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steve_k_xk (05-11-2022)
#54
05-11-2022, 01:25 AM
Senior Member
#55
Today, 04:28 AM
Member
Hello forum,
After a bit of investigation it seems that my XK started suffering from the same issue as described in this thread.
I would like to replace the differential fluid to determine if it will resolve the issue. Can anyone recommend a suitable differential fluid?
Additionally, are there any known additives that could be beneficial?
Thank you!
After a bit of investigation it seems that my XK started suffering from the same issue as described in this thread.
I would like to replace the differential fluid to determine if it will resolve the issue. Can anyone recommend a suitable differential fluid?
Additionally, are there any known additives that could be beneficial?
Thank you!
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