I thought it would be a brilliant idea to go down and soak
every nut, bolt and joint on the recently bought X300
rear suspension.

No hurry, so it was Liquid Wrench + Dexron.

At the very end ... what's this?

Looks like a worse for wear piece of shipping tape peeling off.

Peel it off and there is a green "Genuine Jaguar Rebuilt" plate
bolted to the diff cover under the two bolts on the right side.

So were these outsourced to a rebuilder or did they come from
some rebuild facility at the factory.

I'm thinking that if it was the factory, maybe they were done
by the most squinty eyed, chain smoking, tea drinking old hands
around. That would be a good thing.

Just the fact that it is newer than original is a good thing
Probably by many years. It's hard to imagine one of these
beasts needing replacement anytime soon after original
vehicle sale.

Turning the output shafts while holding the input shaft still
is really smooth. Unfortunately, they turn in opposite directions.

Nothing a Detroit Auburn won't fix, but it would have a double score

Oh, JEPC crosses the number to a 3.58 open diff.


++

 

I suspect the rebuilding was outsourced....or at very least wouldn't be surprised if it was outsourced.


Cheers
DD

 

Hi Plums,

According to jaguarclassicparts.com, Jaguar offered both "new" and "exchange" pricing on differentials supplied as service parts. If your diff has a label with red and yellow stripes, it's probably the same 3.58:1 GKN Salisbury diff as in our '93 XJ40.

Regarding rebuilding, my guess is that few if any of these diffs needed to be rebuilt within the first 100K miles of service, but customer complaints about rear end noise prompted numerous unnecessary diff swaps. The noise the customer was complaining about could have been due to anything from deterioration of the big subframe bushes to a diff output shaft bearing, most of which could have easily been replaced with the diff in situ.

My guess is that your diff was rebuilt by GKN, the company that manufactured the Salisbury differentials for Jaguar. The Salisbury company was founded in 1901 and acquired by Dana in 1919. The Salisbury diffs used in the Jaguar saloons from Series I through X300 are nearly identical to Danas (some XJ-S models were fitted with Danas). My assumption is that GKN manufactured the Salisburys for Jaguar either in partnership with, or license from, Dana Spicer. GKN is headquartered in England but now operates worldwide. I read on one of their web pages that they are the world's largest supplier of constant velocity joints:

http://www.gkn.com/aboutus/Pages/default.aspx


For future readers of this thread, in the U.S., Coventry West rebuilds Jaguar differentials, and rather than rebuilding my own next time, I'll seriously consider getting a professionally-rebuilt exchange unit from them.

The photos at the links below show the complete rebuild process for a Jaguar Salisbury diff:

Welcome to Jag-lovers - Members Photo Viewing Page
Welcome to Jag-lovers - Members Photo Viewing Page
Welcome to Jag-lovers - Members Photo Viewing Page
Welcome to Jag-lovers - Members Photo Viewing Page


Cheers,

Don

 

Well, thanks to you both for answering. (thanks button still not working here)

I hadn't thought of GKN being the rebuilder, but that would make sense as
opposed to Jaguar. Coventry West would have been a close next best as
the official rebuilder for Jaguar exchange stock. But only CWI would know,
and they're not saying.

It was definitely a rebuilt and not new because of the green plate. There was
no striped label but the number on the plate matches the 3.58 open "exchange"
part number in JEPC. I guess on the assembly line the colored label is needed
as a quick visual confirmation that the right part gets picked off the shelf.

My hope is that with relatively fresh bearings and factory clearances, I can just
disassemble, inspect and reassemble with the Auburn replacement.

While the Auburn needs the bolt holes opened up to 29/64, it is relatively
inexpensive. Currently $315 at Summit with free shipping and $75 in "Summit Bucks".
So, $240 net if you have a use for a $75 credit at Summit. Tom's Differentials has
it at $275 but probably involves shipping and certainly no coupon.

 

plums,

Please keep us informed on your project. Sounds like it's going to be interesting!

Cheers,

Don

 

Is there an advantage over the Jag OEM red/yellow striped tag with a BLACK X (limited slip 3:58) with the Auburn Gear????

I 'rescued' 5 or 6 diffs (3:58 for XJ40/X300) from the trash when I worked at the dealer.
They were going to scrap them and I asked if I could take them home. They said to get rid of them by tomorrow so I loaded them into my Chevy Pickup. I think I have 3 open diffs and 2 'power-lock' somewhere in my shop. They needed bearings but otherwise in great shape.

bob gauff

 

The Auburn is simply easier to obtain and cheaper in my
circumstances and what is available locally as rebuildable
cores.

The Dana/Salisbury posi seems to be out of production and
would probably be in the neighbourhood of $600 even if
available.

The rebuild parts including plates are still available, but someone
did the arithmetic and a full rebuild costs more in parts than
dropping in the Auburn. The Auburn is non-rebuildable, but should
last long enough.

On the other hand, if a Jag LSD had been available, I certainly
would have gone that route. But shipping is a killer and I needed
the matching front mounting plate that came with buying a complete
suspension. Not to mention also getting a set of fresh rotors, calipers
and pads with the unit.

 

quick question guys - do any of the XJ40 models have factory LSD?

ta

Larry

 

Yes!!!

bob gauff

 

Ok, I'll bite, does the '94 VDP?

Larry

 

Hi Larry,

As far as I know, the only ways to tell are to either look at the part number tag and/or colored adhesive label on the back of the diff and look up those identifiers at jaguarclassicparts.com, or raise both rear wheels off the ground and turn one wheel. If the other wheel turns in the opposite direction, it's an open diff. If they turn in the same direction, it's an LSD.

Cheers,

Don

 

Thanks once again Don!

I have JECD installed and just checked the part numbers/colour codes etc ..

I'm not sure why, but the wife isn't too supportive of me getting the big jack out and disappearing into the garage on Xmas eve so I guess checking the car will have to wait a few days ....

All the best to you and the family

Have a great Christmas!

Larry

 

Larry,

I can relate. My wife has already told me I'll be spending the rest of the day wrapping presents!

Merry Christmas to you and yours as well!

Cheers,

Don

 

And I have a NEW 3.58 limited slip diff 3.58 in the box from Jaguar I was going to use in mine when I wanted to do a custom turbo setup. Now that I have a 04 added to the stable Ill probobly just sell it to get it out to someone who will use it. Black and Yellow stripped with the black X's

 

I wish we could claim that we are/were the official rebuilder for Jaguar differentials! For the most part, we bypass Jaguar and source out the OEM bearings, seals, etc. through the manufacturers.

Most of them did not, but as Don indicated, the only way to tell for sure is to get it up in the air. Maybe you'll be one of the lucky ones!