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[Omega Pixie]

I have just removed both gearbox sumps to change the atf in the small sump I have found what seams to be a broken up bakerlite ring any ideas. gear box appears to work ok.

[JamesV6CDX]

Yep that's the thrust washer

You need to remove the bellhousing to get to it...

There is a guide in the maintenance section.

Replace with uprated sonnax washer - go have a read

[Omega Pixie]

thanks knew someone here would know

[JamesV6CDX]

Don't continue driving like it - could do damage.

[Omega Pixie]

I realy need to take the gearbox out then am I ok to put the sumps back on to save damaging any thing

[Kevin Wood]

I realy need to take the gearbox out then am I ok to put the sumps back on to save damaging any thing

Yes, I would put the sumps back on to avoid damage as you say and also dirt ingress.

Kevin

[Omega Pixie]

where do i get the uprated sonnax thust washer? can anyone explain in laymans terms what the thrust washer does other than it is a thrust bearing how does not having one effect the gearbox?

[Marks DTM Calib]

where do i get the uprated sonnax thust washer? can anyone explain in laymans terms what the thrust washer does other than it is a thrust bearing how does not having one effect the gearbox?

Its part of what controls the end float in the front section of the box (plus soem plastic shims, the washer is the running surface).

Without it the shaft makes contact with the oil pump face and can/will affect oil pressure in the box.

Sassanch is the best to advice on where to get one although you could try www.jpat.co.uk

[Marks DTM Calib]

Its this part here....you can see how it fits on the pump face.

http://www.sonnax.com/part_summary.php?id=3337&pl=3

[Marks DTM Calib]

Sonnax list the following as UK sources:

Automatic Choice England      Radstock        Bath    01761-436688
JP Automatic     Upper Langford   North Somerset    01934-852772     http://www.jpat.co.uk/
Sussex Auto Parts Ltd.       Hailsham   East Sussex  01323-848886VM Transmission Products Ltd.  Hayes      Middlesex      0208-848-9911

[Omega Pixie]

Many thanks for the wealth of information the idea of removing the gearbox is a little daunting but I dare say I will get stuck in to it.

[Varche]

Hi. I have just done mine. I too felt quite daunted by the enormity of the task. I had a lot of support and assistance from other OOF members.

have a read of the various guides or items on gearbox removal on here and in haynes book of stuff.

I would recommend having physical help from someone else. The gearbox and torque convertor are very heavy.

The Sonnax part number is 54701-03K for GM /Isuzu 4L30E.

 You will also need a paper gasket for the oil pump, a rubber gasket for the end housing (it is about 9 inches in diameter) and possibly a rubber washer (about 1 inch in diameter) for the layshaft to torque converter seal. There is a seal on the bell housing for the torque convertor that is about 2 inch in diameter which is probably worth replacing at the same time. JPat do a gearbox overhaul kit which probably includes these and much more. Have a chat with either them or the other people mentioned to see if you can get what you need without buying stuff you don't need!

If you do decide to go ahead and need any tips PM me your Email address. If you lived nearer I would pop round and give you a hand. It is a lovely easy job and you don't get at all messy!

varche