cup box

[si polo coupe]

Hi guys.
right bought the cup gearbox off yoof couple months back and only now got around to taking it apart, i have pics of the gearbox and the diff apart, would just like some info on how i am to up the preload.






















The last two pictures are what is stamped on the diff, which is vw motorsport and gtm/gtn
So back to my orignal question, what part/parts do i need to up the preload, and any info on where i can get them.
Cheers Simon

[hayesey]

to increase the preload you add more/thicker plates into the diff clutch pack. 

[si polo coupe]

Cheers hayesey for the reply.
The plates are what is pictured in the 4th photo, am i correct, any ideas on where i can get thicker ones. Thanks again

[hayesey]

yeah pictures 4, 5 and 6 show clutch plates. 

Is this a Gemini/Ricardo diff?  Maybe somewhere there can help?  Otherwise, just search for differential/gearbox specialists and get in touch with them explaining the situation.  Hopefully you'll find one who can source or make new plates.

[Andy]

You could try Gripper: http://www.davemacprops.com/dmpgrippercontacts.html

Alternatively, you could try Ricardo (they bought Gemini). People who might be able to help you (if they're still there!) are Mick Strong or Iain Wight. Reception number is 01926 319319.

I wouldn't hold out any hope on Ricardo though, they scrapped (as in skipped!) all their 085 transmission stuff in November 2006. Maybe they'd supply you a drawing out the back door if you asked nicely though?!