A good drive line shop should be able to help you with this also I took my 51 driveshaft in to have it shortened and balanced and took them the differential trunnions measurements from the Trans am rear end Im running in mine and they fitted my driveshaft with the Dual size ujoint like longbox55 is talking about.
Fit great without any problems
Good luck Bob

Todd


Some people are like Slinkies, Their not really good for nothing... But they still bring a smile to your face when you push them down the stairs.

1951 3100 350 TBI Gallery Toddzilla... "$old"