Anyone know the Dana 60 rear?

[fastTa]

I'll bet the 9" your friend has is 35 axles spline with a Detriot Locker. They are not friendly for the street. I'm running a TruTrac, which is an all-gear posi. However, again, I think I got lucky with good QA work because even my stock rear made more noise than this 9" does. And I've read how loud it can get.

Could be a spool too. Lot's of guys that get the 9"-10.5" rear end get spools if it is going to be mainly a track car. The 10.5"-12" are usually live axle top loading assemblies. Spools are pretty noisy on the street and don't like corners all that well.

The Dana 60's have a 9.75" ring gear. The Mopar rear's called Mopar 8.75's came with.... you guessed.....a 8.75" ring gear.

[Rhode Island Red]

Got the answers y'all wnated about what broke in the 12-bolts. ALL were 6 speed.

Apparently most of the cases were due to factory not setting up the rears properly from the factory (whine... whine... whine...break) or improper installs on their part. Another couple cases were like the second link, cracking axle tube. The bent axle was due to extreme hp 600+ and a 6k clutch dump .
2 cases of track junkies doing what they do best... reapeated high rpm clutch dumps eventually causing damaging the gear set little by little (replacement of gears was all was needed) . Some of the info was 2nd hand as a couple of people who blew weren't there themselves.
Moral of the story ... Order rear, take to a rear guy you trust, take apart and rebuild to proper specs, and install to proper specs. And most of all do not assume the factory got it right the first time.

I think it was a spool, cannot confirm as I forgot to ask about the diff (he runs 11.3's currently @ 445rwhp).

[Injuneer]

Interesting that both the examples you gave were Moser 12-bolts. My Strange has stood up to 5-6K clutch dumps with a Street Twin, huge slicks and anywhere from 500 (NA) to 625HP (1 stage N2O). A buddy with a 750HP blower motor and an M6 had only one problem with his Strange and that was with the "standard" 9-disc posi burning out. After he replaced it with the 14-disc "super strength" Eaton, he has no problems. Neither of us was using it on a weekly basis or even "frequently" though. The die-hard racers need something beefier.