7 1/4 to 8 3/4 rear end swap info needed

Ok, to clear up a few things here!! All stock non- modified A body 8 3/4" rear ends were small bolt pattern! If you happen to find one in unmodified condition it will have a 4" bolt pattern and you should be able to use your current wheel/tire setup. You can also use your 7 1/4" shock plates if you enlongate the holes. The axle tube from your 7 1/4" is 2 1/2" and the tube from all other Mopar rear ends is 3" so there is not much grinding to do, but you will need the correct u-bolts. If you are going to buy shock plates, try to make sure that they are from an A body as there is a small difference in the drop length for the shock bolt from other B and E bodies, which use the same shock plate!

Agree with the measuring of your driveshaft length with the suspension loaded and the car on the ground! Many people measure the length differently, so maybe a call to your guy is in order to see what he prefers the measurement to be! At any rate, the yoke should be pushed into the tail shaft all the way, then backed out about 2", no less and no more. This will give you some travel in and out and still have plenty of contact in the middle range!

I thinking is $1200-1500 for a totally rebuilt ready to drop in unit with full documentation and receipts! Hope this helps, and good luck with the swap!! Geof