Curtis it was Tim (BrisVR4) and he was talking about the EVO III Centre Differential. I still haven't got to the bottom of this. I swung past Ken's shop today and he was fixing up a customers EVO III gearbox. The owner couldn't get parts anywhere and so Ken was swapping in good VR4 gears. He says he has been doing it for years and has never had an issue so I just don't know. I messed up once doing stuff like this and wrecked a front ring and pinion in the 8G VR4 and it happened REAL QUICK which suggests to me that if this was an issue Ken would have found out about it by now /ubbthreads/images/graemlins/dunno.gif
It confuses the hell out of me. I know the EVO III front ring and pinion is one tooth different from ours which is why if you use the EVO III front ring and pinion you MUST MUST MUST use the EVO III transfer case which is NOT a 1.09 ratio but I have never heard of issues with the diff. If you go looking for an aftermarket centre diff for a VR4 you will find a lot of the parts offered are actually listed for use in an EVO 1,2 or 3. So if anyone is running an aftermarket centre diff I'd be real interested to hear if it has given them any issues and if they can confirm if the diff is VR4 or Evo 1,2 or 3 specific.
EVO 1 & 2 gears are completely compatible with a VR4 box (well an RS/Evo VR4 box) as long as you use the 3.909 ratio rear end. So if the diffs work in EVO 1,2 and 3 cars I can't see where the difference would be. It bothers me that Tim said that because he knows his stuff and I've got a damn expensive hybrid box sitting bolted up to my car with a mix of EVO III, RS/EVO VR4 gears, EVO III diff and a 3.545 front and rear ring and pinion.
Is the front ring and pinion what drives the differential?
Edit: Ken has done the 3.307 swap as well Curtis and says it rocks on the highway. I think you need a JDM RVR gearbox. I'll ask him again when I see him what are you looking for exactly, just the front diff?