I know this is an old post but I ordered from Mike at Whitehead based on the feedback here.
I ordered a rebuilt R200 3.7 with a Quaife LSD in September 2020.
After 6 months of getting the run around and still no diff, I asked for a refund.
Now 5 weeks later and no refund.
I know lots of things can happen and COVID has thrown a wrench into many things.
I think I've been more than patient and I'm still hoping Mike will take care of this but for now, I wanted to leave some feedback.