Hey Chuck, ...Just put a Quaife in today. So, yes, the ACR is now ready to run longer sessions - like 50 minutes and I'd love to have had a shot at this field on a high speed track - though I think it would have been unfair to them.
FYI, a couple of friends who track their Gen IV ACR's have already lost their diffs. My advice for the Gen IV ACR's, if you track them, change your fluids regularly and you may want to consider upgrading your diff to a Quaife or a OS Giken Superlock. Dan