it's time to find my rear axle

Sorry, I wouldn't piss on the best part of a 9 inch. I
Idgaf how popular and how many parts are available. I've seen just as many of those break as anything else. Horsepower robbing junk. Use an 8 3/4 or the 60. If it's just road going, not much hard race, that 8 3/4 will last a long time. It's also the lightest of the three. If you're thinking something big down the road for power, put the 60 in and be done. I'll third the motion for talking to Cass at Dr. Diff.