7.5 ford rearend with a mini spool. i had an old 8.8 mini spool layin around and i wanted know what the difference was in the 8.8 and 7.5 rears. well i go to install like u normally would, the side things went in just like it was made for it. but the center things were too "fat". my buddy has a precision surface grinder so i was in luck, all i did was i put the side things in and gotta pair of calipers and measured it, i would make it easy on u but i forgot the size i think its a little less than an inch... the stock axles fit the spool and the cross pin did to. the center blocks were a little to tall too but i got it to fit with just a grinder and about a half hour of test fit and grinding. im sure im missing stuff so if ya got any q's just ask ill try my best to help out :thumbsup: