I'm buying an auburn posi with 373s however i'm thinking of buying a ford 9". Would i need kit and if i do where can i get one. Also if that's not a good idea what size chevy posi could i buy that would hold up to a 350 block with a 383 stroker kit?

 

Well if your buying an auburn posi with 3.73 set up for A 10 BOLT AND THEN WANT TO TURN AROUND AND BUY A 9" FOR THEN YOU wasted YOUR MONEY..... None of that stuff will swap over...

As far as buying a kit to put a 9" in YES you definately have to buy a kit....Essentially you can use ANY ford 9" third member and gearing...BUT you need Custom Axles and a Custom housing....Unless you are very good at welding and fabrication in which case you could weld brackets on and shorten a stock housing...

Moser and Currie both sell the housings with all of the brackets welded on and a bolt on torque arm bracket.....Then you will also need an adaptor U-joint as the Yoke on the diff is larger than a thirdgen driveshaft...

As I found out there is no EASY/Cheap way to do it...Plus for some cars you will have to buy new rear brakes....For instance I had a 9 bolt GM rear with disk brakes...They did not make housings to use these....So I had to pay another 600 for a pro-street wilwood disk setup....Trust me the prices snowball fast...

 

Thanks for the input. How much can the gm 8.5" hold up to. Also whats with the spline 28 30 Can someone explain it to me thanks.

 

the number of splines changed starting in '88 with some cars i believe and all had the new ones in 89, or was it they started in 89? I can't remember. At least this'll get back up to the top and someone else can tell us both.