Gearbox issues

[phhl]

Hi,
I have a Jaguar XJ8 2003 X350 with 73K which has recently developed a couple of problems with the auto box. The car will not change into 5th or 6th unless I move the gear lever from "D" to "5" and then back to "D" again. Also when stone cold the car surges and the revs jump around slightly, this only happens until its hot.
The box is otherwise very smooth and it's almost silent on the changes.

I have had a re-flash of the software on the box but this did not cure it. I have been reading about an additive called "Dr Tranny" made by Lubegard, it's mainly for torque converter lock up shudder, however, I have read that the surge problem is related to that. Does anyone know if this additive is successful and if it is ok to add it into my car?
Does anyone have any advise that you can offer me please?

Thanks
P H

[Triple7]

Change the gearbox oil will be your best bet me thinks.

[NormanD]

Triple7 said:

Change the gearbox oil will be your best bet me thinks.

I agree, what ever Jaguar say the oil is well past it's 'Sell by Date'

Would you leave the same oil in the engine at that mileage, maybe some people do

[phhl]

I think that's my next move. My local Indie has quoted £284 to replace the sump and trans fluid, is that about right?

[andyps]

phhl said:

I think that's my next move. My local Indie has quoted £284 to replace the sump and trans fluid, is that about right?

That is cheap, do check if that is the original spec gearbox oil, in itself from Jaguar the oil would cost more than that.

[S6 Devil]

That's not particularly cheap. I bought all the parts and fluid from a Mercedes dealer (the gearbox is a Mercedes 722.6 automatic gearbox, well it is for a 1998 XJR, not sure if it's the same for yours). Total cost £95.68 +vat. I then paid a local mechanic £50 to change it.
The part numbers are as follows from the Mercedes dealer:
Filter 5021F £8.54
Sump gasket 5006E £7.18
Seal ring P606242 £0.79
Transmission fluid Shell ATF 3403 M115 Part no:JLM 20292 £10.52 per litre. you will need 7 litres.

You will also need a dipstick which you can buy from ebay for about £10.

Total £174.81

Edited by S6 Devil on Sunday 23 September 02:40

[andyps]

If the 03 XJ is like an 03 XK it will have the 6 speed box which needs a different type of oil.

[rswift]

Morning,

Have a look here,

http://www.xk8-parts.com/index.php/category/xk8-an...

Scroll to the bottom of the page, the correct oil & sump is £148 & vat.

I bought this kit, and my local indie charged me an hours labour to do the job on my X350. It wasn't showing any faults, just my peace of mind around 70k

The service from XK8 parts was superb (no connection)

[rswift]

On the same page is a video of how to do the change.... Having watched it, very happy to have paid to have it done.

[andyps]

rswift said:

Morning,

Have a look here,

http://www.xk8-parts.com/index.php/category/xk8-an...

Scroll to the bottom of the page, the correct oil & sump is £148 & vat.

I bought this kit, and my local indie charged me an hours labour to do the job on my X350. It wasn't showing any faults, just my peace of mind around 70k

The service from XK8 parts was superb (no connection)

That was what I did, the price has gone down since the start of the year when I had mine done.

[ihouston]

Can anybody recommend a good Independent Jag specialist in the Kent area to do a gearbox oil change - thinking of getting mine done as it has covered 104k now - no issues but think it might be a good idea
Cheers
Ian