Rear end

[AyerForce]

I jacked up my car this past weekend to check out the rear end. The casting number was 3707306 but there was no P for posi. When I spun the rear tires to check the ratio both tires spun in the same direction like a posi unit would. Can you install a posi unit onto a non-posi chuck or what else was/is available for posi units for these cars? The ratio ended up being around 3.50. Also how strong are these factory rear ends? Should I baby it until I get the money to do something different or is ok to have a litle fun on and maybe make a few runs at the track?

[MikeKy55]

Many non-posi rear end were changed to posi. If you are considering replacing it, why not run it hard if you want? The only arguement against that for me would be the resale value not broken. Prices get crazy on e-bay for these rears in posi. The only way to know it's an original posi carrier vs welded spider gears or a spool would be to pull it and look.

[the4x4pig]

The only way to know it's an original posi carrier vs welded spider gears or a spool would be to pull it and look.


If it was welded or a spool and you have driven it you would know pretty quick. Dont know if you have ever driven it though.

The rear should hold up as long as you dont hook up. Then you will probably break it.

[AyerForce]

If it were a posi rear, what do you think I could get for the entire rear end, hub to hub. I really want to 4 link the car with a 9" rear, simply because my father has a 9" in the Nova and we could collect/swap chucks. I guess i'll just have to be careful with it seeing I don't want to break it because I may want to sell it and its the only rear I have and have no money to replace it.

[the4x4pig]

If it had a P-case third member you could get pretty good money, like Mikeky55 said they get some crazy money on ebay some times. That is what I plan on doing with mine. If it is a stock case with a posi in it you still could get $400-500 or so for the center section I would guess. The housing and axles dont seem to fetch much around my parts but might do better where you are.

I would do like Mikeky55 said and just enjoy it untill you can afford an upgrade. As long as you dont hook you should be fine. If something does break it would prob be the axle shafts and you can get new ones of those.