Ive got a MY95 WRX with standard rear diff, the car is pushing just over 420hp and I expect to drive it hard!!
what should I upgrade the rear diff too, if i even should....I know nothing on this topic so any help would be great, API,911 ect hehe

 

what gearbox/clutch you got cos i think they will give first.But my mate has a v5 typeR same as mine running only 350 bhp and has killed 2 gearboxes and many clutches diff has never let go yet

 

Of course the typeR has an R180 rear diff, a WRX an R160....

The greabox will go first, the diff is less likely to fail than wearout quickly, an upgrade to an R180 means using full Sti rear shafts, arms and uprights though.

Simon

 

I have a PPG gearbox, it should be fine with the power, the Clutch should be fine its uprated too

 

You will be ok with the R160 imho.
Use a good oil suitable for the LSD type you have.

 

thanks graham

 

Stock is a VC, so the oil type is irrelevant to the LSD part, so its just a good diff oil!

Simon