This is a long shot i know!
Does the dedra and the q4 rear diff has the same final drive (dont know a better word) i hane a dedra gearbox, centre diff ant complete front subframe and can get my hands on a complete q4 rear end.

I would expect so but I can't confirm.

I'm sure both will physically fit the same so try find some technical data on the two cars. If they have the same final drive ratio it will be the same.

Hi and thank you for chipping in
They dont have the same final drive, but since the final drive sits in the gearbox before the transfer case i wouldnt think it could do any difference..
Have been trying to find final drive ratios on them but it seems to be easier selling ice to eskimos

Ok, according to EPER and google seems the dedra uses the diff from the Delta integrale 8v and the q4 from the 16v.
At least crown and pinion wheel has same partnumbers.
Anyone know if theese are interchangable? Pretty sure it is but nice to know

You can change between Dedra and Q4 rear diff, both use same gear ratio.

Thank you good news

Yes, and Q4 have Torsen rear diff, much better then Dedra's

I know
Might buy a transfercase from a q4 or a delta 16v if one comes along but atleast i have the parts i need now..

This is right, but I heard from "unchecked site", that the more simple Dedra diff should hold more torque.
I cannot prove this, but years ago I read a thread about a really powerful Integrale doing quarter miles (about 800HP), its owner changed from Torsen to cheap Dedra diff after certain rear diff defects, because it should be stronger (maybe these diffs are cheaper, only - as I stated, I cannot prove this)

Up to now I do not have any problems with rear Torsen with really much power, but nevertheless this statement is very interesting.

Would be very interresting to know wich parts that breaks on the thorsen.. The gears in the diff is very helical (is that the correct english term?) as in as far from straight cut you can get. This might make the whole assembly twist and brake? Same as helical gearbox vs straight cut