looking for some opinions here on my 9 inch swap. got a kit with 35 spline axles that came with the housing kit from e-bay. this is a Quick Performance kit. i have never messed with the 9 incher before and always had gm 12 bolts and 10 bolts. this will go into my 81 malibu. i kinda get my projects lined up in the winter here (midwest) so i can start them in the spring and have everything ready. also have a Right Stuff rear disc kit ready. what i found out is when you have the 35 spline axles that puts you in another category for posi's and cases. seems like i can locate a million 31 and 28 posi's but 35 spline are in a different price range along with the 2.250 cases. i use my malibu as a street car only with street type rubber. it is equipped with a 375hp blue print crate engine with turbo 350 trans and current 3.70 open stock rear. i really don't think i need 35 spline axles and i think 31 would do just fine for my type of crusing. one of my options is to sell the 35 spline and buy the 31 spline axles and smaller carrier bearing case which seem to be everywhere around here. i really don't think this crate engine is going to bust up a 31 spline 9 inch with street tires. my career mechanic friends say go with the 35 spline and suck up the extra cost and quit whining about the extra cost (lol). spool is totally out of the question. i'll not get the hell scared out of me again with one. ok so all opinions are welcome. btw those 35 axles look like tree stumps. thanks.