So maybe ours re-branded are what they are selling? Or maybe an AMG unit.

But say, one was to pull a tranny and put this mopar one in I wonder if you'd notice anything still, esp with the xj12 diff to go with it.


The real story, I think.. is that the AMG Engineers are trolling the Jaguar Engineers who thought the XJR was going to beat the E55. Haha.

 

I gave up on the EGS controller and purhased a standalone unit.. However to this date I havent had the time to put it in. So no updates. I learned to put the car in 4th and shift to drive when I hit 25+ mph which seems to bypass the transmission lockout making the car drive pretty much normal. I also have to backup real slow.

 

It seem's the AMG guys are simply putting in the later TCU's (programmable) and not having any issues?

 

i have to change gears mine are shot, ring pinion i would say, put reverse, slams , and grinding noise from rear, havent lifted yet but i would like to get some help on tech to get her running right, hence i gotta take rear irs out, is there anybody that has part number for bushings?

 

Avos did you ever find out if your contact was able to just offer a ratio change on our TCMs? if they can do you have any idea on cost and how would I go about getting it done?

 

Unfortunately not, but my goal went further than a gear ratio, it was to get a full new(er) adjusted TCM program. This was with Evotech in Germany, you could ask them, but these extreme low volume items cost them more in losses to work on other tuning stuff I'm afraid, it was hard to get time from them, and what they tried didn't work out and would have taken more time to investigate, whihc never came...

 

hello there from Canada
so I have read this whole forum on diffs awesome info guys.
so I have a stock 01 xj8 vanden plas with the 4.0l v8 which I'm going to pull out and do an ls swap now ive been trying to figure out what can my rear diff handle for power I want to know what to swap my diff out with and what gearing I should go with this is whats holding me back on how far I'm going with the ls build power wise my hopes are to make around 600hp maybe more if I can depending on what I find out on the diff any info and help would be great I feel like this the thread to be in on this topic

 

Eric, I've just done this. I wouldn't advise using the weedy stock 14 HU unit.


Ive used a 15 HU former power lock- but went to 3.07 gears for a Dana 44, I had splined shafts and flanges made up to work with the Jaguar X308 jurid coupling.


The Dana 44 is very strong- its a 8.5 inch unit.


The stock 15 HU GKN diff uses 10 input splines and 19 output splines.


The Dana 44 utlises a 26 spline for input and I went for a 30 spline output. This opened up the option to use a Torsen T2R LSD carrier.






Above shows the new Dana 44 and amended components- below in this picture shows the older GKN Jaguar 15 HU components.

The shafts are 48 HRC (hardness). The flange adaptors have been designed and made to interface onto the Jaguar Jurid coupling without potential for whirl. The bearings used are a combination of those compatible with a Dana 44 and those that are compatible with the GKN Jaguar 15HU differential.


The new set up should be ample in terms of handling a whole ton of Bhp.

 

thank so much for the fast response and all the help
Count Iblis.
this definitely puts my mind at ease as I was worried that I wouldn't be able to reach my hp goals or exceed them lol. now to start part hunting I will start a thread of my build in the near future for all to enjoy and will have more questions in the future as well lol