Posted by PhilS on Monday, March 08, 2004 at 8:04AM :
In Reply to: Synchromesh transmission posted by Robert on Monday, March 08, 2004 at 1:16AM :
This is a NP420 synchromesh transmission used from 1956 and up. Note that the shift tower is located at the front edge of the trans. The non-sync models have the tower located more towards the center.
If what you have was the correct trans for the '54, then it should be a non-sync "after" type used from 1951-56 with a casting number of C-38711 on the right side.
Check the Power-Wagon Identfication page at the below link for more pics of the 3 different type transmissions.