Hi All
i posted this in the wrong forum yesterday and been advised to repost here.
Hi All
i have recently had an issue with the gearbox in my 2003 4.2 xjr supercharger.
gearbox fault light followed by jerky gear changes and no reverse gear limp mode. car drove fine upto this point with no noises or indications.
i took it to a local garage after reading numerous post here decided to start with the obvious. check and change the automatic transmission fluid and filter.
Drained oil and removed the pan and found small fine iron filings and slightly larger swarf in the bottom of the pan.see photos below.
I have a couple of questions on how to best move forward.
ive been quoted starting around £1850+vat to repair existing gearbox i believe my gearbox idenification to be "ZF6HP26"( anyone know if that is correct?) and is used in other vehicles such as mercs, land rover discoveries and BMWs as well as other jaguars,
if i buy a used 2nd hand box will it swap straight out or would i need to change the torque converter also, , can i use the old t.c or will one that comes with a t.c still attached work if it came from a different vehicle such as a 3.0ltr s type or a BMW.
as a new box is out out of my price range what would be the best option and what are the pitfalls ?
any advice would be much appreciated before i spend a load of money.
thanks
Gary

 

Hi there the automatic transmission of x350/356/358 diesel or gas are all the same its is the differential that has a different ratio for the diesel and v6 gas maybe also for the 3,5v8 .
if you put in a second hand I remember the jaguar mecanic saying you would need to recalibrate over computer at the dealer or the specialist

 

Yes they are ZF 6HP26 2003-2009

 

1,800 Euro sounds low for an overhaul I think.
If you decide to rebuild your existing transmission, you could first try a valve body exchange (or rebuild the one you have ) and then try running the car. Since that would be part of a proper overhaul anyway.
Someone with more experience could comment on the amount of that bushing metal in the pan.
One major pitfall is getting the wrong transmission for your swap. I think your torque converter and valve body should work fine in your matching swap trans.
But find out exactly which used ZF will work before you buy!
Also, You might want to search out a ZF specialist for the overhaul if you decide on that.

 

if it’s throwing a gearbox fault it’s probably smoked, what are the exact codes? you can drop the valve body and run an air check to make sure it’s a mechanical issue.


the xjr and str gearbox has more clutches than other jag variants.

 

the xjr and str gearbox has more clutches than other jag variants.[/QUOTE]


That is good to know. Was under mine yesterday and noticed the filter/pan sbtilllooksbrand new after six years.
Back to OT, the metal in pan is troubling. I would look for a donor car. I thought all XJ would work fine. And always replace the torque converter. They trap metal debris and would contaminate a rebuild with shavings.
These transmissions are very rugged. A used one with fresh fluid and filter might outlast the rest of the car.

 

thanks Petz
ive managed to source a used box and torque converter from a 2007 xjr. would this still need to be calibrated over a computer or do you think straight swap?
thanks
Gary

 

Marrying the TCM to the rest of the car is needed. And the early x350 electronics system changed before 2007 model. That might complicate integrating them.
Wish Brutal was around. He could answer how difficult it is. The US and UK XJ’s are a little off on MY, here 2006 and 2007 are x356. A 2007 in the UK could be a x358. If you saw the car, the different shape is an easy giveaway.

 

The TCMs will be incompatible and using SDD to try and recalibrate will not work. Ask me how I know.

There is a whole thread on my transmission rebuild which was NOT successful and almost certainly because the valve body was contaminated.

IF I had just replaced the valve body I probably would have been good. Hindsite is wonderful.

 

Thanks Jackra
i wont jump in and get the box then
im a bit green with regards to the abreviations / terminology tcms ?transmission control module? sdd?
have you got a link to your thread so i can have a read up on it and see if i can pick through the pitfulls.
sell for spares or repair might be a better opion for me i dont want to get in to deep ££££££
cheers gary

 

The following thread details what I should have done first AFTER thoroughly flushing out the transmission:

https://www.jaguarforums.com/forum/x...cement-192881/

My rebuild thread:

https://www.jaguarforums.com/forum/x...ebuild-227587/

 

Hi . I have managed to get photos of all the fault codes from the garage and it is a long list. Makes me wonder if its some kind of wireing issue. Any input would be greatly appreciated. Photos attached.

 

test battery asap remove codes and restart

 

At this stage I would not get "too bent out of shape" with all the error messages since your car was running ok before the transmission issue.

One obvious question is how good is your battery? Having a degraded battery in these cars can cause all sorts of issues.

However the transmission is for sure shot and just rebuilding the valve body alone is not a road to success since some physical damage has definitely happened.

Were there any signs of leaks from the transmission at all before all this happened?

 

I had the battery tested and was all good. I was only a couple of hundred yards down the road when this happend.
Just a thought , after i purchased the car 3 years ago i discovered the sun roof had a leek after leaving it at the airport for 2 weeks whille we were on holiday. I found water was ingressing via the sun roof and running down the front door pillar and ending in the driver footwell. (Right hand drive).
been dry for 2 1/2 years since it was repaired.
are thete any major electicle components in that area i should look at.

 

No Leaks prior

 

Only some wiring no components. Maybe it is feasible that water travelled down a wire into a component lower down ?

One thing I should have stated before is that your existing TCM will swap into the transmision you mentioned that you were considering.

Since its purely electronic in operation it will not be contaminated with any metal particles.

Also many used transmissions come with the original torque converter.

When I swapped out my transmission I used the torque converter that came with the low mileage one I purchased and simply exchanged the TCM with my original one.

I did have to recalibrate using JLR SDD.