Is there a difference between the xj and xjr transmissions? Someone is telling me no....Thanks!

 

It's the same transmission, but there might be programming differences.

 

That Much I figured..MANY THANKS!...Crossing my fingers tomorrow on my transmission fiasco:O)

 

The torque converter and mechatronic programming is different. Same gear ratios.

 

Is it the stall that is different in the converter? As far as programing that's not within the transmission itself correct?


The reason Im asking is because I can get an extremely low mile unit for practically nothing meanwhile I cant find a low mile xjr unit for the life of me

 

Stall speed was increased in the XK series, but not in the XJ, I think you will find it is the torsional springs and possibly different friction material used in the lock-up clutch to accommodate the addition 100hp. If it were me, I would get the low mileage tranny, get a rebuilt converter for the XJR (they run about $300) and swap Mechatronic unit from the valve body.

http://kinergo.eu/news/rebuilding-of...explained.html

 

That article just reconfirmed my fears of things I been reading about these converters! Likely there is a better option for the factory xjr one. Seems there are many different internal variations over the years. Likely later ones fixing issues of the earlier units.Uggg...I think I just found a relatively low mile 80k 2004 xjr unit. Perhaps I can install that and rebuild mine for rainy day. I REALLY appreciate all your help. My knowledge of these cars expands exponentially as I break stuff

 

The real difference isn't the core of the tranny, but the torque converter. Like I said before, if I found a low mileage N/A tranny cheap, I would never reuse the torque converter anyway, (including the price in my decision) I would get one rebuilt that is for the model used, in this case XJR, and swap the Mechatronics out to retain the firmware/default adaptions.

 

David,


I appreciate all of your help. I found a 70,000 mile transmission and converter out of an xjr that was wrecked. I think I'm going that route and going to have my current transmission and converter redone.


I'm also talking to someone in Australia about this transmission that deals with performance builds. Im not so sure my car with the twin screw really needs a fully built transmission but certainly some things can be upgraded while rebuilding. Just for informational purpose's I'll post the link to their page. Rebuilt Ford ZF 6-speed Transmission | BTA Motorsports