the rearend went out in my 77 cadillac coupe....im in lexington ky and searched all over the state for a rearend with no luck...the guy that had the car b4 me put a different year rear end in it but will not work with the original driveshaft becasue it has double knuckles on each end(constant velocity blah blah blah)....can anyone shed some light on this for me cause when i call around junkyards they're telling me it will work when i know it wont...thanks