We have the GM 10 Bolts here, although getting a bit hard to find these days.
They only ever came out on our Chev V8 powered HOLDEN Monaro coupes in the late 60's.
They are a great diff if not too old or thrashed,so no matter if you use one of these or a f#@* 9" diff, they could both be as good or as bad as each other depending on how much of a hard life they have had.
I'm running a 3.08 ratio in my Torana 5.0 litre SS Hatchback and this is a great daily driver ratio and runs 14.7 sec quarter mile times and will still wind the speedo off the clock at 130 miles per hour. Not a bad ratio !!!!!!!!!
If you can get a 10 bolt cheap, have it reconditioned, and it will outlast the vehicle if maintained properly.
This would cost less than buying a 9", having it re-coed, modifying the axles and drums for the stud pattern and also possibly having to spend more money on making sure no brake modifications have to be made to run the F#*% drum brakes.
Hope this helps a little.....all the best, Doc Bob.
