John;
I understand this now. The 55 P/U center section (pumpkin) is a Spicer too and the axles from the 46 are the same, except for their lenght. This IS a great combination as there ALL truck parts, going into a truck.
I stand corrected for the "Micky Mouse" description as I thought a passenger car (non Spicer) center section was being used & the axles (somehow) welded, to stay in.
George;
The rear axle housing must stay stationary & that's why the new mounts, as the torque tube was solid and held it before.
The 1955 era truck 'rear ends' were designed for 200+/- Hp. engines, in commercial service. I would think if NOT abused it would "hold up" just fine. The 1939s were designed for 100 Hp. so your smart to change.
Good luck to all.
