I had no doubt the technology was out there, I just could not find any info as to where and what type of rear end these cars have.

I went to my local Jag dealership to find out info on the rear end and they would not give me the time of day because I wasnt a customer. I am just looking for an off the shelf bolt in. Where did you get yours? Thats really the question I am looking for an answer to.

Thanks

 

Paramount Performance has a LSD available for the XJR and XKRs.

 

I looked into paramount back when I had my XJR, besides wanting way to much money for the LSD they had nothing on gears. Told me the LSD would make all the difference, which yes it will make some difference compared to an open differential/one wheel wonder. I still need gears though. I really need to know the type of rear end, or someone who does that can point me in the right direction or better fill me in directly.

 

I found the answer to my question. Talking quite some $$$$ to do so but will be well worth it.

 

Hi there!

I am looking around to see how best to increase the diff ratio on an XKR. I would like to lower the gearing by 15 to 20%. Note that I have a Tremec T56 fitted and no longer the auto box. By the way, I have a Quaife LSD.

Cheers.

 

Since you have a manual and don't have to worry about the speed signal any more, you should just be able to get the whole pumpkin out of an X300 XJR. not sure on the XKs, but on the X308s the X300 diff will bolt right in and came with several nice gearing options like 3.54 posi and 3.73 posi.

 

Just remember the nose of the X300 diff is offset where as the X100 is inline so you need the front plate of the subframe as well..... Technically the X300 diff is not designed to take more than 350 rwhp, will be ok on a rolling acceleration but standing fast starts will kill it

 

does the supercharger you mentioned bolt onto a stock 2000 xjr ? Looking for an upgrade to rid myself of the bulky intercooler sitting on top of my valve covers

 

Hello! You will need to look at the fuel supply also, including injectors. I made the mistake of only putting the KB in the first time and blew the head gaskets!

 

Hello!! Glad to see this discussion resurrected as I'm looking to upgrade my SC to a twin-screw. Willafizz - did you do one of Avos's kits or something else? He's pretty much quit making the kits although in another thread he somewhat mentions that he might do another run. My plan is to have the heads done, put on the TS SC, and upgrade the exhaust. I already have 200-cell cats, so I just have to do a cat-back upgrade. Also, I have a set of Racewear head studs waiting to be installed with the cleaned up heads. I'm still gathering parts and hopefully, one of those parts will be a TS!