Hey guys,

just got back from a 450 km round trip to get my 5hp24 repaired... At the same time, I didn't only get the A drum and pressure valve done, it has been REALLY well reinforced.

The 5hp24 was used in the Audi S6 and IIRC the S8. Both have MORE power than the 3.2/4.0 versions of our V8s. Resulting in some alterations inside the tranny, which the Jag version didn't get. We all got the "cheaper" versions, identical to the BMW ones, with a 3 friction plate clutch pack per side between the D and E clutches (middle drum). This is the "cheap" version. Not able to take as much power but also having longer gear changes and more wear on the clutch plates.

Audi got a special addition (which can be added to all 5hp24 trannies), where as the middle drum received 4 friction plates per side. The drum size is the same, just the position for the clip rings is further outwards. Doesn't take more or less space in the tranny. This will make the shifts quicker and at the same time have less wear on the clutches (less travel).

So, it can be retrofitted and that is exactly what we did to my tranny today. Btw. simply replacing the A drum isn't enough. I had contaminated friction plates all the way back to the E clutch pack. You def want to pull the bugger apart. It was COATED in metal flakes inside...

Here a few pictures. I couldn't grab my phone all the time, as I was working with the expert (so I can understand what is happening inside).

Something else to know... If you have a black stamp on the A drum, that means "welded" (geschweisst). It basically means, that the A drum failed quality control on it's first atempt and had to be welded. These drums seem to fail more commonly than others!

So, important things to do:
- change pressure valve (even without tranny damage!)
- install a new A drum
- install new A drum clutch pack
- install new A drum bearing
- check the entire tranny for particles and order wisely

Good thing to do:
- upgrade middle drum to Audi S6/S8 version with 4 clutches per pack

Taking apart:






The magnets are coated in metal particles (and I cleaned them a mere 25k km ago!):





Rebuild... First and second pics show the new Audi drum which has been used:













And the obvious reason for this entire job:

 

This is really interesting stuff, it's interesting to see the differences between the Audi version and the XJ one. Do you think it would be easy to convert a box from an Audi to fit an XJ?
I'm interested to see the results after you've got the car running again.

 

You can't fit the entire box... As the Audi version is AWD - obviously. But parts between torque converter and output shaft iidentical (oh, not the oilfilter!).

My tranny guy said, it will shift a little harder for a little while, until the ECU has adapted.

I'm looking forward to the results.Willbe doing a few things under the car...

 

Good Luck Daim!

 

Hi Daim,


I am lookin for for a good tranny shop to reinforce my 5HP24.
I am in Bavaria - but since you mentioned that your shop was 450km away from Bremen - there is a chance that that shop wich did your reinforcement for your 5HP24 is somewere in the middle of Germany :-)
Could you please provide the name/adress of the shop.


cheers
firebird

 

450 km round trip About 235 km each direction... From Bavaria it would be a good long drive...

 

Oh, btw., shifting is quicker but a little harder when driven hard. Gear changes just work. I have a problem with my tranny fluid level so it might be related to that. Still was worth doing the job!

 

Wow, what a very interesting and informative post. Great pictures! Danke schoen! There is an updated 5HP30 used int he later E39 540s. Do you know if there are any upgrades worth incorporating from that version or does the recommended upgrade still apply?

 

The problem is the shaft diameter. The 30 at the end refers to the diameter. The 5hp24 has a 24 mm shaft. You'd need to change so much and stuff it into the body of the tranny. It would take more effort to fiddle around with that BUT you won't really need it. The uprated one as shown here can take more power than the XJR can produce - in current configuration with a 5.0l supercharged engine...

The Z8 from Alpina had 500 nm and 500 hp... The 5hp24 was more than fine. In the RS6 it took 450 hp and 580 nm... No problem other than the common A drum. The same goes for the W12.

Just needs the extra clutch plate in 3rd and 4th gears. No adaptions required...

 

are you willing to provide the shop information, you can also pm me for that.

what is your problem with your fluid level? Isn*t the fluid level checked with removed screw by a specific temperature?

thanks

 

The problem with the level is achieving the correct temperature and also getting the car fully level etc.

A slight nose down/up position is enough to ruin the setup. Instead I'll be retrofitting a dip stick to get this to work properly and be able to check the fluid easier. It will also make servicability easier as well... Just on a side not.

Send me a PM and I'll give you the guy's number and details