Help w/ 7 1/4 to 8 3/4 change over

Remember too that in 1970 they changed the position of the brake line distribution block on the rear end housing, making the flex hose too short if you use the 71 and later 8 3/4. I just used a coupler piece provided by a mobile hydraulic hose maker that services disabled roadside semi trucks, he knew just what I was talking about and had the part on hand. I used a 71 rear from a Duster in my 66 Cuda in this example. Otherwise, all other dimensions of the rear itself are the same, except the aforementioned driveshaft length and the shockplates. Geof