Newbie Needs Info Help Please

wuts up man, well first off ... the rear end, have a look at it and if it had a pan on back then its a 7 1/4 if theres no pan on back and 3rd member comes out the dront of it then its an 8 3/4, which is awsome.keep it if its an 8 3/4, if u crawl under there there will be a tag on one of the bolts that will tell u the gears in it. if u are gunna make it a racer go w/ somethin from 3.91 to 4.10 to 4.56 depending on how extreme. if its a daily driver a real good gear is 3.55.and make sure its a sure grip (posi)...and u can get a disk brake kit w/ the small bolt pattern if u prefer. if ur rear is not an 8 3/4 and u want to put one in u can find them in alot of the a bodies. u can make one from a b body fit like my freind in his 72 dart but its tight and he had to bang out the fender well wich im sure u dont want to do. sooo yeah u can pick up a good 8 3/4 out of any abod....dart,duster, barracuda,and soo on goog luck hunting man