So I picked this 9in up a while ago was pretty much bolt in ready less gears 250$ for it from a swap meet bought the center for 30$ and 80$ for a new set of 430 gears,mini spool aslo from a swap ,got the bracket kit from speedway 100$. These are pretty typical prices for used parts around PA just found a local junkyard got a pile of 9in centers guy told me 50$ a piece 30$ per housing not too bad I got a bunch myself . Anyhow I use a back frame section from a 78 Malibu for a jig alot easier then doing under the car. I measured my coils at ride height end up with 10" that can very but gets you in the close ball park so I have chunks of pipe I put in to act like ride height in the jig. I set my pinions at 4* down some people like 2* some like 6*, all mine get 4* put into them and have no issues. MEASURE MEASURE MEASURE take your time .... And yes it's a full floating rear axle that's just what I happened to have plus they look cooler too lol l. This is NOT a how to but just to show that these can be built at home very reasonable I done quite afew for myself and others have had no complaints so must be alright lol. I grabbed one of my 7.5 rears out of the scrap pile to compare weight figured it be a useful thing to know.