You have to keep in mind to that from 73 to 77 GM put in nothing higher then a 3:42 in those corp. axles. If you find a car that had A/C from the factory you will most likly have a 3:08 or lower gear & finding a rear end that has a 3:23 or 3:42 is going to be hard as the gas crunch was going on & most dealers ordered as low as gear as they could to get the best miliage from the car. 73 to 76 you can take the posi center section from the firebird or camaro & use the posi unit out of them as they will bolt in , but you will have to then buy the gears you want but you'll have excatly what you want by doing that. I have a 462 in m 73 GTO with the 3:73 rear gears & in town it's great but out on the road 70 mph is all you want to go if your going for a long trip, & make sure you bring a fat wallet because it really likes the gas stations during the trip. I'm looking at going back to the 3:08's or maybe the 3:23's just to get more speed out on the hwy. I forgot I run an M-22 4 speed with that rear end to. I could also go to a 5 speed or 6 speed & keep the 3:73's. They are fun around town. But to get back there are a lot of the F-body rear ends so you could get the posi unit from one of those for your car to.
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