Hello Jon,
Following up on your request in the
"Old Bits That Still Work - Muncie Transmissions" post, I feel just as strongly about the competence of a Chevy 12-bolt rear end for use in today's vintage racing. Like our Muncie, we've run the same 12-bolt rear in my Camaro for the past 11 years. It's been rebuilt once, but was showing only very moderate wear.
My 12-bolt uses a factory style, Salisbury/clutch type, limited slip. This same 12-bolt came with the car when I purchased it, and it had already had the housing ends modified for "c-clip eliminators." Not a bad idea if you're concerned about safety, or what could go wrong without these axle capturing devices.
I'd also note, to insure less issues at the track, to vent them better. I use the stock location where the plastic tube-and-cap style item goes in the center section. I pressed in my own short tube, that then accepts a hose, which runs to a breather/catch can in the trunk. Without the venting, like the Muncie discussion, the built up pressure may push out 90-weight.. Perhaps out of the stock vent/cap if you leave it with the factory piece.
Though I too am not a fan of Ford 9" rears in first-generation Camaros, I do understand why folks try to keep/warrant/justify them in their cars. Beyond being a very stout piece, a 9-inch makes it a bunch easier to swap gear ratios. For those running vastly different tracks, perhaps multiple times per year, you'd almost want to have two complete 12-bolt axle assemblies to aid the effort. The Ford guys have it a bunch easier with the ring and pinion being carried in a drop-out pumpkin.
-Chad
