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hi all, recently bought an rs6 avant 2004 and love it. however the pinion bearing in my rear has taken a turn for the worse. i picked up a second hand diff yesterday, went to fit today but i have different ratios. anyone know if there are different ratios fitted to the rs6. i have a 3.2 in my car and was supplied a 4.1 as an rs6 diff.
thanks in advance

FON

You should have a 3 letter code stamped on the diff housing. There are 4 different codes with 2 different ratios. Which one(s) have you got?

what is this FON??
is it the code on the alloy part of the bottom of the diff, if so both have the code but different ratios.

both have jkp stamped on them

Should be 3 letters followed by 5 numbers.

thanks, have you got the codes and relevant ratios to hand? done endless searching but not come up with anything.

DSA xxxxx : 37:9 -> 4.111
EUS xxxxx : 37:9 -> 4.111
DUR xxxxx : 37:10 -> 3.700
EUU xxxxx : 37:10 -> 3.700

What happened to the hotlink on FON?

FON

thanks I'll have a look for the code, strange that mine measures as a 3.2:1 though.

FON.

FON

but the hotlinks gone

Ok so the only code I can find is ggw followed by 6 numbers. On both diffs. Some googling seems to suggest this is 3.19 ratio which is what I have.
Anyone know about this code?

Mmm. Found some more info. GGW is the final drive code for the RS6. Looks like it was only fitted to the RS6. The ratio is 37:9.

I can't find any 3.2 diffs on the RS6 era quattro cars. Where are you getting that from?

Ok, I'm going to pull the bottoms of both tomoz so I can count the teeth to see what's going on for sure. Thanks for all the help.

So took the diff out last night and stripped it, thankfully had 37/9 ratio, pinion bearing was really seized so getting the wrong reading when working it out from spinning pinion x times to 1 rev of output. New diff in and all good!
Nice one for the help, much appreciated