People are still interested in a LSD for our STR's. Nobody has done it yet but I wanted to post a good thread about how the Lincoln LS guys figured it out.

I think we could get this to work but somebody will need to be a guinea pig. The STR's are getting so cheap maybe it will happen??

It looks like it requires a Lincoln LS Gen I (2000-2002) diff and axles which should be identical to the S Type Gen I parts. These parts are installed in the Lincoln LS Gen II (2003-2006) housing. It looks like it should fit the Gen II S Type housing too??

The Jaguar would need to stay with the stock gear ratio because of the car's electronics. The LS can run any rear ratio without problems.

Lincoln LS Limited Slip Differential bolt-in... - Lincoln vs Cadillac
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Thanks clubairth. This will likely pan-out for the STR.

 

Did we determine if the S-Type differential was 8" or 8.8"? Mafioso (Luigi) installed a Quaif in his STR. The differential had to be ground to accept the LSD. Something must have went awry with the install because his rearend eventually locked up. I believe the LS Lincoln boys are using an 8.8 Traction-Lok carrier in their 8" carriers. Hope the 8.8 Traction-Lok slips in our rears as it does the Lincoln LS. Shooting a PM to Avos...he'll know.

 

Perfect, will also fit the X350 then...

Last hurdle is how to reprogram the ZF TCM for a ratio change...

 

Very interesting development, although that thread is from 2008, and I believe some of that info has been posted on here before. An LSD for the STR is definitely top of the list for desperately needed mods.

Not sure if those internals will indeed fit inside a 03+ diff housing, or will it be necessary to convert to complete 00-02 diff assembly in order to facilitate the gen1 diff and axels swap into a gen2 car/case.

 

We understand that the STR carrier must be ground to accept the Quiafe LSD. Question is: Does this also pertain to the 8.8" Traction-Lok differential? Do we have an 8" carrier like the Lincoln LS or 8.8" carrier?

 

Just seen your pm, but I don't know anything about the internals of the Stype diffs am afraid. I guess you should be able to pick up a diff very cheap form the breakers, thats what I would do.

 

Hi Avos. Thanks for getting back to us. Bet the 03 XKR has the same diffferential?

 

It’s from the 2006 model year (the aluminum XK) where they are very similar to the Stype ones. This is why the Quaife model for the aluminum one is relatively easy to fit in the Stype as well.

 

I am interested in finding out if one can fit an 8.8 Ford LSD in a 2004 STR. I plan to put a Ford True-Trac Auburn, or similar 28 spline LSD in my 2000 S-type. I purchased a Gen 1, 3:31 ratio differential to rebuild with an LSD, but this project is at least 6 months out. I have been tracking the prices of Ford 8.8 LSDs and in the past year average prices has gone up close to $100 USD.

As far as I can tell the installation in the Gen 1 should be very straight forward. Drop the differential, tear it apart, install new bearings, put your stock gears onto the LSD, fit it in, shim it up, put the rear cover back on, and slam it back in, fill her up with oil. Piece of cake!

 

We've read here that with some grinding, an 8.8" can be installed into the STR carrier. This is what must be performed with the Quaiff.

 

The one person I knew that installed a LSD in his car was from an XKR. He did state that he had to get it re-shimmed many times, and that it finally broke (not sure which part broke).

 

Luigi? He said it was a Quaiff. Likely a poor install.

 

I know a chap in the UK who's had the Quaife unit fitted to his '04 XJR, which is an identical diff to the STR. No grinding, it just slipped straight in.

The issue is the price....

 

Yes the price!

That's why I am still hoping the 8.8" will work. The parts are out there used so that will help with the total cost.
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Ya but I think it was for a xkr (sorry should have clarified that)

 

Yep, I remember him saying it was intended for an XKR. Wonder if it was a good idea for him to use an XKR Quiafe?

 

Ditto, the Quaife cost moolah. We're going to have to try an 8.8" Traction-Lok or Auburn.

 

I spent some time this evening reading the write up on the Lincoln LS LSD swap. I Searched on all the 8.8 IRS differentials and studied all the images I could find.

It seems to me that Ford created the 8.0 differential specifically for the DEW 98 platform. It appears that they made a slightly smaller housing that fits only 8" ring gears. I think that they use the 8.8 bearing and carrier that uses the same ring gear bolt mounting pattern. This is why the LS LSD swap works with the 8.8 carrier and 8" ring gear.

I visually can't tell what the internal differences are between the Gen 1 differential and Gen II differential housings. Perhaps someone on the forum can post some images of the 2 housings side-by-side and let us know the differences. It would be nice to see if the housing cover bold pattern is the same between the 8.0 and 8.8 housing. Can anyone measure to see if they are the same? I'de wager that the internal carrier mounts are the same.

Thus from my perspective, putting LSD in a STR becomes a matter of cost.
I believe I could swap a 8.8 Cobra or 8.8 Explorer differential into an STR.
You would have to adapt the Jaguar differential cover to the 8.8 housing,(or make an adapter mount) and build a new front mount to match up with the front housing mount. Internally, you would have to use the 8.0 ring and pinion so it would match up with the driveshaft donut flange. Plus the LSD has to fit 28 spline axles.

Eventually for my STR I'll head in this direction, but I don't have a spare $1K right now to purchase the parts.

 

I think I see what your problem is ... Too many cars dude.

2004 S-Type R
2000 S-type 4.0 (project car)
1997 Jaguar XJ6 Vanden Plas
1966 Jaguar XKE W/Boss 302, SCCA Race car (Brother's car - I did the conversion 30 years ago - stored in my work shop)
1962 Jaguar XKE (Project car)
1984 Camaro Z28, 1999 Oldsmobile Silhouette

I suffer from this as well. I have a real hard time letting them go ...