I decided to spend my birthday today fitting the Quaife ATB diff that has been sitting on my bench for a couple of months; first time I could tell everything else to get stuffed and actually do a job I wanted to get done for myself. I struck a major snag when reassembling the diff with the ATB, the bearings I had bought- Timken set 37, are not the correct ones. Unfortunately I didn't check them against the old ones before I installed them, so there's no returning the wrong ones, but I would appreciate confirmation from anyone who knows what bearings I need to purchase. The numbers are partly scuffed off the old ones. This is a 2008 4.2 supercharged (SV8), the diff with only one bearing retaining cap and a circlip at the other end (weird arrangement and the most difficult diff I have ever worked on). One thread I have dug up states the bearings are 603012 & 603049, this looks correct for the outer cup but is impossible to confirm with the way the numbers are scuffed off the inner cone in particular. Having bought the wrong bearings based on info in one thread, I want to avoid buying a second wrong set based on info in another thread. Thanks in advance.

 

Ok no info forthcoming here but that's ok...for anyone searching this subject, there's a thread on the forum that states the bearings as Timken 'set 37'. The inner part (cone) of set 37 is 603049 which is the correct part, but the outer (cup) of set 37 is the wrong cup, too narrow. Cup 603012 is the correct one.
I've just lowered the car after completing the installation, just got to tighten the suspension bolts and take it for a test drive. Got called in to dinner at the wrong moment!

Update: the ATB transforms the car as others have reported. Situations where the car would previously start to spin one wheel and the traction control would kill the power, it now just pounces into action. Very happy although that's just after one drive.