Hey guys so i came across a rear end where the seller is willing to swap rear ends for my small 7 3/4 from my slant six. Now my rear end is currently in the car which i still use. What do i need to do this swap so i can drive off the same day. My dart has its original 904 transmission and slant 6. His 8 3/4 rear end is coming out of a 340 v8 duster. Woukld the drive shaft need to be cut ? or can i just bolt it on and go?