Originally Posted by
SILVERSCOOB81
If the silver sticker that I removed from the top of the box had VN in the number then I should be safe to assume the rear diff has been changed to match otherwise I wouldn't have been able to drive the car perfectly ok for the last 12 months is that right David
Never assume anything where transmission codes are concerned.
There is nothing to suggest that because the gearbox has been changed that anyone knew or thought to change the diff.
To be safe you need to take out the diff filler and drain plugs , shine a light in and count the crown wheel teeth. That will tell us what is fitted.
Once you know for sure what the rear diff is in there you can move on.
If the centre diff went, the car would drive perfectly with no suggestion of anything wrong at all. It would just be 2WD.
Ratios are :
9 - 40 = 4.444 [ 40 divided by 9 ] JDM STi
9 - 37 = 4.111 JDM WRX
10 - 39 = 3.900 JDM RA versions
11 - 39 = 3.545 Standard UK Now that is where the problem gets worse, as you
can see 3.9 and 3.545 use a 39 tooth crown wheel.
So you need to try to look in far enough to count the pinion teeth. It would
NOT be unreasonable to assume if you have 39, that it is a 3.545 as that it what it
ought to be.
BUT, to be sure and save a busted centre diff you need to check.
Good Luck David APi