The xjr and xkr from 00 to 03 have the five speed 722.6 Mercedes transmission.

Mercedes has a new seven speed transmission called the 722.9
As far as i can tell these two transmission are vary similar and have a idental case/bolt patterns.

My questions
1. Is the 722.6 using a bell housing adapter plate? or is it using a custom bell housing made by mb for jag?
2. would people be interested in this swap?

 

I'm not asking this to play Devil's advocate, I'm asking in case maybe you can learn me something:

Even if you can work out all the hardware and software logistics to do this swap, what's the point? It would cost a fortune, and only be of interest to very few of the owners of a very small population of vehicles..if there was much performance to be gained.

I've heard 5 speed ZF owners complain that the car sometimes seems to spend alot of time hunting for a gear. Where's the upside ?

 

Oh don't be a spoil sport. Mo is bettah!! Now if there was a way to connect my 21 speed Shimano derailer to my XJR, I could probably do 0-60 a little faster than my Honda CBR.

 

I don't know, I thought I was missing something and I'm never afraid to admit it happens.

 

Thought about swap to a couple of years ago when I didn’t knew that much ;-). The electronics will cost you a fortune to get right (if you manage). Maybe physical all can be made to fit, and you could use the bell house from the current 722.6 box to make it to fit the jaguar, but as JTO says what would be the point?

You need to find a version that is strong as not all 722.9s where that. There was a reason why MB didn’t use the 7 speed for a long time in the more powerful cars. If you want a recent version 722.9 box that is strong enough it will cost also a small fortune again.

So if it is for economy it is not feasible, and if it is to be quicker, there are other much cheaper ways to accomplish that.

 

Thanks for your input, and nice to bump into you again. If I may, could you take a look at the "XKR smell" thread and voice your thoughts if you wish? Thanks Andre.

 

avos,

Thank you for your input. I was thinking it would prob be a ton of money. from what i have found the 722.6 can be beefed up quite a bit. i noticed from your signature that you have a lsd on your jag. May i ask how you accomplished that? i currently have another thread started trying to figure out what diff is installed on my 00 xkr. I may have to have it rebuild/swapped soon and i was wondering how difficult it is to get lsd installed.

jagtech

Thank you for your input as well. The main purpose for this thread was to get opinions on the matter. I should prob have made that question #3 what is your opinion?

 

sorry avos,

maybe i should read the other post before i ask questions here that you already are answering. Thanks.

 

No problem ;-) There is another thread with some more details you have in options (i.e. clutch type or ATB). I have a 2 way clutch LSD, which is relatively expensive. You might want to try the internals of a Thornton Powr lock from the older jags (at least that is what was stated in the Jaguar World Monthly magazine). You also need an expert to put it together, but this also accounts for the ATB ones from Quaife.

@JTO, lots of text there, but most things I could come up with have been said already. As an addition maybe, smells after a WOT from the exhaust could be very different as once you release the throttle the mixture is very lean, but this is only for the converts with roof open situation.

 

Thanks for taking the time to read through the thread Andre, I appreciate it.

If the "internals of a Thornton Powr-lok from the older Jags" have been identified as interchangable, that is probably what the microfiche pages I posted from the '95-'97 car were. The name "Thornton" is one I am not familiar with.

If that is in fact the case, you can buy a rebuilt 3.58 Powr-Lok (JLM1922/38R) from Motorcars and use the internals. You would also have to pay them for the core and not have one to return, so that would end up at $1150. I don't know how that compares to the cost of buying the new internal parts individually, but it's not a terrible cost.

 

Please note I do not have experience with these diffs, all I know is that JGAXKR has done something like this, and it was mentioned in the JWM. Here is the link from JGAXKR:
https://www.jaguarforums.com/forum/s...ad.php?t=21259

You will need a different ratio though, otherwise you need to reprogram the TCM. Not sure where the treshold lies, maybe a 3.27 or a 2.88 might still work, but a 3.58 seems to be out of range what JGAXKR experienced, so the TCM will through an error and go into limp mode (for the 4.0 XKRs).

 

Yes, I missed that. So the one I posted is the one he used, plus the reprogramming. Then finding a source for the 3.27 Powr-Lok internals might be the better answer, but I didn't see a lower ratio Jaguar factory limited slip than that so far.

 

Older models had also a 2.88, but that one seems very popular for Cobra kits and is difficult to find.

 

hey, if I start a thread about this business of swapping 4.2 in place of 4.0, will you add your input? I read the Racing Green info, it is not very complete.

I have 2:88 Powr-Loks from XJ40, XJS and Series III XJ6 Vanden Plas. Also the XJS Dana 2:87 , and that is listed as a Powr-Lok also. I just assumed that the carrier etc. would not fit the later XJ8/ XK8 housings, as they are not similar in size externally.

 

Sure, what is RG telling then?

 

I have a 2003 xkr and its a zf 6 speed auto in it.