Ive been looking to widen the rear stance of my XJR without spacers and am curious if anyone knows of an alternative axle and lower control arm which is longer than the original? I.E. xjs, xj40 . . Is there perhaps a database that I have not discovered which gives dimensions of various jag rear ends?

 

They're pretty much all the same, I think it's a custom job to be honest.

 

I figured as much. Finding longer wheel studs has been a bit of a challenge.

 

The XJ-S rear arm will NOT fit, as it is a totally different shape and is fitted totally different (brackets, 2 shocks with each a separate spring). The Jaguar MK I IRS is totally different to the MK II IRS. The only 'similarity' is the load bearing differential with driveshafts using U-joints.

As the lower arms are also cast on the MK II IRS, it'll be a totally custom job. You COULD though have it a bit differently set up. The wishbones are mounted to a center carrier. This is a cast aluminium 'ring' shape. In this, the diff is mounted as well as the wishbones. You could see if you can get a shop to CNC/mill one/two out of a solid piece of aluminium. Like that you would be able to space the wishbones wider without weld ng the cast iron (which is basically impossible after these many years). But then you'll need to move the shocks and springs outwards. And have some kind of output shaft extension on the diff for the drive shafts.

Just use spacers OR get some widened rims... That is the easiest and probably most effective.

 

Thanks for the great info. Sounds like spacers are it, Has anyone had experience finding longer wheel studs?

 

You don't use longer wheel studs if over a 1/4", you use off-set studs. Thus using the existing one's with short lugs. I have them on my Corvette to fit my 11.5 rims. I plan on getting 1/2" spacers (just enough to fill the well), but I need to make sure the front clears the rotation so I don't catch the lip. There is a place in Jacksonville FL (I haven't used him yet) that makes and sells them, he's the Lugman...

 

How much wider are you trying to go??

 

15 - 20mm each side. I though I read that jag borrowed its hubs from an old Chrysler product? finding specs for longer wheel studs has been a challenge.

 

That's a lot of effort for something you can do simply and cheaply with spacers.
Are you set on your current wheels? You can achieve the same result with wider wheels and the right offset.
Also remember you will need your guards rolled if you go that wide

 

Im set on the wheels, will be rolling the fenders. The issue with spacers is you run out of wheel stud. I have the original xjr pentas with slightly wider tires. Ive yet to see a stock xjr with pentas which are close to flush with the body which is what I'm going for especially in the rear as they are inset almost to the point of looking dumb in my opinion.

 

No you don't. You attach the spacer/adapter to the car's studs with the included nuts and they have pressed in studs that you then bolt the wheels to. As already mentioned above by Highhorse.

https://www.carid.com/1998-jaguar-xj...-78874243.html

 

Yes which means grinding down the original studs to 15mm meaning that if I wanted to go back to stock I would be purchasing and installing new original studs.

 

No, there are pockets on the back of the wheels for the studs. I ran 20mm spacers and didn't have to touch anything. And depending on wheels, you can drill out the pockets further if they don't have enough clearance.

 

I might give that a shot.

 

I suggest the following:
Tuck the wider wheels into the car rather than making them stick out more outwardly.
You have a good amount of room on the INSIDE of the wheel well to fit a very fat set of rear tires on a 308.

To do,this, you need the paper offset wheel, but it looks cool.