Thread: posi axle

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i dont really know much about splines and all. i want a 12 bolt posi axle with 373 gears, which splines should i go with? any other info will help thanks.

The standard axle for the 12 bolt is 30 spline. This is usually adequate unless BIG power or stoopid activities are on the menu. The next step up is quality aftermarket 30 splines, followed by 33 splines if really warranted.

I'm currently facing a bit of a problem with an axle assembly swap. I broke the one-legger and am having a posi from an '87 police cruiser put in, but I had to go with a 5" bolt circle. My wheels (old Camaro rims which I like and have good rubber) are 4 3/4". My old axle splines are different, so that's out. I've heard of drilling the flanges for the other bolt circle, but no machine shop here seems to get it. I guess I'll have to do it myself (carefully!) Had to have the drive shaft cut too.

Any suggestions? I assume I should use the old drums and/or axles to make a template. I'd like to use my old drums and backing plates but don't know if the backing plates will work on that housing. I guess I can drill the drums on the "new" assembly if I have to, or just buy some. It's still in the shop now and I'm probably going to use old 5" BC steel wheels to get it home. Thanks!