I had that same setup. With a properly setup 4.10 gear, I never broke gear sets. Went through mini lockers/carriers and RCV's no problem though. I bet with the 300m upgrade, and Detroit it's a stout setup (as long as you run a reasonable gear/tire)
I've got plenty of time slips. Usually on the 150 shot would 60' in the 1.49-1.55 range. Best time on a 150 shot is 6.95 @ 100.5. In Crossville, TN it went 6.98 @ 100.98.
It seems to work well for stockish suspension. Hell, it's been 1.49 on a 17" Mickey Drag Radial on heavy 17" wheels.
http://knoxville.craigslist.org/cto/4794841078.html
'91 Ford Mustang original 5.0/AOD car. I purchased the car 8 years ago completely stock in Northern Nevada, so it has NO RUST. Since I purchased it, I have installed:
Trick Flow Track Heat Heads
1.7 Stud Mount Trick Flow Roller Rockers
TFS...
Re: Dana 60 Front
Do you know if it is 35 spline throughout? I didn't think there were any factory made open knuckle, low pinion drivers drop D60's? Maybe something custom made for Quigley?