My recent post regarding XJR valve springs has led to a discussion about the change from the AJ26S to AJ27S engines in the middle of the X308 model.

This got me thinking... was there any changes to the XJR transmission between 1998 and 2003?

The reason I ask this is because I've got a 1999 XJR, and I'm looking to buy a transmission out of a 1998 XJR. Will this work?

Even if it would work mechanically, would it work electrically? Would it "talk" nicely to my car?

I've seen a lot of information regrading tranny rebuilds, repairs, OBD codes, etc. but haven't seen anything regrading interchangeability.

Thanks!

-Caleb

 

Caleb,
It is my understanding that the transmissions are the same from 1998-2003.
I recently put a 1999 unit in my 98 XJR. These are Mercedes W5A 580 or otherwise known as 722.6 if I recall correctly. In Jaguar lingo, they are W5A 580. These appear in several different vehicles, but a friend of mine who owns a transmission shop cautioned that we need to have the units intended for Jaguar, as some may have different ratios.

I ended up going directly to Mercedes for seals, filter and I also put a new electrical connector on it ($20.00). These have a tendency to leak a bit, so for $20.00 it it a no-brainer.

Hope that helps

 

It will work, and as far as I know there have been some small mechanical changes from the 2000MY. Try to get the torque converter from the 1998, as that one will most likely has a oil drain plug. This was removed from the 2000my, though I am not sure when the cutoff date exactly was, so some 1999MYcars are already without, though I know 1998 ones that still have them.

 

Right.. The torque converters in the 98 and 99 year have a drain plug. When I drained the replacement transmission and torque converter, I was able to get 95% of the old oil out. It took just a touch over 9 litres of oil and I believe the capacity is 9.5 litres. It is nice to be able to have all clean oil in them.

One thing though...if your old unit has failed, I would not use the old converter. If you get the 98 transmission that is in good working order, make sure you get the torque converter with it. Also, run a can of flush through the cooler lines before hooking them up to the replacement unit.

You probably know that, but if there was metal floating around in the transmission, there is probably some in the converter as well that would contaminate the new unit. Flushing the cooler lines is important too.

Sounds like you are into a large project... pulling heads and transmission. Good on ya!

 

Yes, I definitely plan on getting the torque converter with it. Good suggestion!

Also, I will have to check and see if my current 1999 converter has a drain plug. That's a good "Top-Tip". :-)