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Overview of Jag differentials

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  #81  
Old 04-06-2017, 10:07 AM
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My 2 cents: Read the thread Combo posted, forget the Jaguar differential and adapt the Lincoln Mark 8 / Cobra pumpkin. You can put in any 8.8 gear ratios and a LSD fits without issues. The Ford housing width is the same as the Jaguar, so S-type Gen 1 axles work.
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  #82  
Old 04-07-2017, 07:09 AM
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Went with the Quaife installed in my 4.2 diff.
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  #83  
Old 07-25-2017, 06:28 PM
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Curious about the "normal" state for e-diff with LSD [2011 xkr].
If per say, and e-diff fault is instigated [fuse 14 removal on xkr], then will the diff operate in low slip/high slip/full lock?
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  #84  
Old 08-14-2017, 02:22 PM
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My xf 2.7 diesel with 1:3.07 ratio diff is howling like a demented ghost at 40 mph. I want to go down the Quaife route but can I use the pinion and ring gear or are they damaged once the howling has started? It is still pretty silent on the overrun and whines just a little at 60 mph.

If I have to renew, was it only Jaguar who used the 8" with 3.07 ratio? I cannot find these ring gears+pinion anywhere on the net.
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  #85  
Old 08-15-2017, 07:33 AM
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As far as I know, once the diff starts making noise its done and you need new gears.
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  #86  
Old 08-15-2017, 01:28 PM
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Hmmmmm, not so good. it seems those 8" 3.07 ratio pinion/ring gear sets are Jaguar only. Anybody know of a dealer having a set languishing on their shelf? (Seems Jag are out of them.)

Alternatively I will have to use a 3.0 ratio set which is only 2% out. Presumably all 8" sets have the same bolt pattern and bearing sizes?
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  #87  
Old 08-16-2017, 09:48 AM
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As far as gear sets go, the Jaguar rings are all the same across 8.0 differentials.
The differences I have seen is in the pinion gear. Ford makes numerous lengths of the pinion shaft to mate to different housings and drive shaft flanges.

Regarding the howling if it is bearing noise, there is the possibility that your gear set is still good. You need to take it apart and inspect to find out.
If you see any pitting across the gear mating surfaces, or highly polished areas where the gears have worn into each other, then they need to be replaced.

The most common failure mode is that the oil level in the differential get too low. (Leaky seals) Then the rear end starts operating hotter. Since the ring gear sits lower in the housing than the bearings they tend to continue being lubricated. The bearings typically start to run dry first. This leads to a whirring sound. If they get to the point that they start to deteriorate, the bearings shed metal particles/shaving. This metal gets ground between the ring and pinion gears, often pitting and wearing them out.

The more you drive the car when this happens, the faster it wears out.
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  #88  
Old 08-16-2017, 09:59 AM
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This is the Lincoln LS P/N for their 3.07 ring an pinion - FORD (XW4Z-4209-GA)
Might see if these are available somewhere, Gen1 rear end.
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  #89  
Old 08-17-2017, 02:05 PM
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Not even the obsolete parts guys I asked had these. So the question is if mine are still good.

My diff has a bit of movement in the ring gear as in giving a clunking noise when changing direction turning it slightly by hand. I believe the crush sleeve should give a pre-load to avoid that?

The teeth on the ring gear are free of pitting and shown nice and even polish across the teeth and top to (nearly) bottom. That applies for both sides of the teeth. To me that sounds like good news?
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  #90  
Old 10-19-2017, 01:52 PM
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Default 5.0L XK NA, LSD confirmed

F-type V6 3.0 S LSD fits into 5.0L NA XK straight bolt on. Probably some XFs and XJs.

https://www.jaguarforums.com/forum/x...5/#post1778640
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Last edited by Andrey; 10-19-2017 at 03:04 PM.
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  #91  
Old 10-23-2017, 05:43 PM
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Any chance the F-type V6S LSD would drop into the V6 XE?
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  #92  
Old 10-30-2017, 07:06 PM
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Nope, wrong ratios. The XE is 2.56:1, the V6S is 3.31:1
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  #93  
Old 12-29-2017, 11:54 AM
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Thanks Cambo. Is the diff ratio different from the final drive?

Car and Driver lists the final drive for the RWD V6 XE as 3.23:1 (which seems close enough to maybe get away with swapping in the 3.31:1)
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  #94  
Old 12-30-2017, 06:49 AM
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Quote:
Originally Posted by Per View Post
Not even the obsolete parts guys I asked had these. So the question is if mine are still good.

My diff has a bit of movement in the ring gear as in giving a clunking noise when changing direction turning it slightly by hand. I believe the crush sleeve should give a pre-load to avoid that?

The teeth on the ring gear are free of pitting and shown nice and even polish across the teeth and top to (nearly) bottom. That applies for both sides of the teeth. To me that sounds like good news?
Update: I got a used but not dead diff from an x350 and used the ring and pinion from that one. So now I am back to a blessed silence. And with the quaife LSD the car is quite acceptable on snow and ice. I always use the best snow tyres available and never use them beyond five years. Even so it was a dog on slippery days. Now the anti spin does reduce accelleration but it does not feel like a giant hand pulls you back. It also takes much more for the rear end to slide through bends i.e. stability control does not kick in as easily. So a very worthwhile upgrade.
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  #95  
Old 12-30-2017, 10:19 AM
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As Per did I bought a good used X350 diff and upgraded that with the Quaife LSD.

So I have a spare diff if I ever need it. I still rate the Quaife upgrade as the best mod I have carried out on my car.
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  #96  
Old 01-06-2018, 04:30 PM
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Quote:
Originally Posted by alphakinase View Post
Thanks Cambo. Is the diff ratio different from the final drive?

Car and Driver lists the final drive for the RWD V6 XE as 3.23:1 (which seems close enough to maybe get away with swapping in the 3.31:1)
Same thing different words.
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