This gets more and more "interesting". I did see one half shaft on Ebay for a 2004 XJ that had the same "toothed" reluctor ring.

Mine are the indented not the raised teeth. I wonder if either type would work? Not going to see tho as too much work if they are not interchangeable.

 

Just took a quick look, JEPC only has one part number for the ABS pickup, XR822753 ($384 JEPC, $200 OEM on Ebay, $10 for the Hong Kong version, I know what I'd try first).

That covers VIN G00442 to H32732. Usually, it's pretty good at calling out different versions for different VINs and whats been superseded.

If there's never been a part revision, then the rings should be interchangeable.

 

Ok maybe worth while trying the S-type half shafts after all.

I am going to have lots of spare parts after all of this!

 

How does the car sense an incorrect drive train speed?

Is it the reluctor ring and pickup only? If it is it should be possible to "modify the reluctor ring to fool it and get away with changed diff ratios?

Just an idea however on thinking further it would not be possible to use the S-type 4.0 half shafts on the XJR or am I missing something here?

If the S-type half shaft reluctor match the pinion gear in the 4.0 S-type and they were interchangeable in my XJR could I keep the pinion gear from the 4.0 diff?

 

there are some very nice GPS speedometers available nowadays!

i used one on an LS conversion, very satisfied, accurate to .01 MPH. plus some things like speed zone notification, and red light when sound is off.

look around just may fit something for your needs. Dakota Digital ,etc.

 

The concern isn't about getting accurate speed data for the driver, it's getting the computers to not freak out and shut the car down into limp home mode.

Thanks though!

 

Engine RPM
Transmission Input shaft speed
Transmission Output shaft speed
Road speed (rear wheel speed)

You can't fool the rear wheel speed because the system "knows" what each measurement should be.

We've been through all this before. Nothing you can do to fix it apart from change the programming of the diff ratio so that the Output Shaft Speed correlates to the Rear Wheel Speed correctly.

The axle ratio provides the factor for the difference between the TCM output shaft speed and the wheel speed.

If you play with the teeth count on the reluctor on the rear wheels then you introduce other problems; incorrect speed measurement, ABS/DSC faults, and so on.

 

And we all know 3.31 is supported, since other market XJs had 3.31s, how about 3.58? :-D

 

Can you get a gps speedo with a old school British "smiths dial" look?

I'd love to change the dials on my bus to mock smiths dials to match my XJ6 Series 1!

 

count i dont know , BUT some look very close to Smiths old skool XJ types ,but i dont know of anyone who can match the old CLIKITY CLIK Smith needle movement!!

HEY Guy, that would be a great seller for old English cars/bikes, a GPS clickity click speedo/ tacho, be so much simpler, and that ignition on and needle sweeps the whole range and back to zero, with lights!

i'm bettin someone is already on it!

 

Maybe total sales would be so low no-one will bother to offer old-style dials.

 

What I've done in the past with an old Lucas speedometer in an early engine conversion I did, was gut the interior of the round gauge and fit in a different speedometer drive. I presume one could to the same with the guts of a GPS speedometer. As long as the speed indicators line up somewhat, it should work. (Probably a lot of extra space left over inside the housing)

 

have a look at SPEED HUT,
lots of stuff there and I think you can build your own.

 

Only answering this one question as I will know less than you about the differential parts:

I have both an indented and raised reflector ring on my 2004 X350 XJR on different sides with no ill effect. The important part is the number of 'teeth' and the outer dimension (which determines the size and spacing of the slots). The sensor does not know nor care how they are actually formed.

When I looked at this last autumn it appeared that the earlier cars used the indented rings but that one side was superseded into the raised teeth kind when stock ran out.

 

Thanks very much for the info Dave, this would explain how that chap was able to just bolt the 4.0 half shafts into his STR and it worked fine.

 

Since this is the current differential thread, I ran across Ford's new 8.8 IRS differential used in the 2015 and newer Mustangs. Its an updated 8.8 differential in a new housing. The heavy duty version uses 34 spline 1/2 shafts and the pinion gear has a 2" ID front bearing. Housings come in both aluminum and steel. I read in other forums that they are already pushing 1000hp through them due to the larger 1/2 shafts. The rear cover has a different bolt pattern than our differential. In order to fit one to our K-frame, one would have to do major surgery and weld up new mounts.
Another project to investigate. Complete differentials for 34 splines with a new Torsen T2R can be purchased for $1900. Probably another $2K for custom axles and drive-shaft. A couple retailers will sell them built up with 3:31 gears for around $2K.

Yeah I know, too much work for the return on the cost...

 

Not good news.

After a bit of a hiatus on my LSD project, because of spending time across the pond, I now know that the outer CV joint of the XJR half shaft is incompatible with that of the 4.0 S-Type half shaft.
The S-Type is significantly larger in all aspects including the splined shaft that goes into the wheel hub compared to the XJR.

As I see it my only choice would be to get some welding done which at this stage I am thinking is too much on top of what I have spent so far.

The Quaiffe solution would have been great.

Maybe a dumb question but why wont the Ford LSD fit in the XJR differential?

Looks like there will not be enough clearance between the LSD housing and the bearing in the second pic.

 

I do not think this is an issue.

I need to press on the bearings etc and then see how it fits.

 

If you go back to this thread https://www.jaguarforums.com/forum/s...install-86430/

A group of us bought a spare Gen2 8" diff and sent it to a specialist diff shop (DTS), for them to "fit an LSD" and the end result was that the standard Ford 8.8" center does not fit inside the Gen2 8" housing, even after grinding some metal away.

So i'm afraid you're going down the same road we tried, been there done that.

In that thread, post #373 and #379, you see comments from forum member kiloken in the UK,.

The halfshafts in an X350 and an S-Type are the same part numbers (for equivalent engine type)

So i'd like to understand where the "totally incompatible" aspect of the driveshafts is.

 

Just for clarification, that looks like you're trying to fit the Torsen LSD into a 4.2L rear carrier. Won't fit without a lot of machining, welding, & whatnot. The "simple-swap" requires the use of the 4.0L rear carrier and axles as a complete assembly. The 4.2L axles are not interchangeable with the 4.0L axles, as they are both different in their lengths, diameters, & construction. The axles must be matched to the appropriate diff carrier to be a drop-in solution