I'm having a torque tube rear end rebuilt for my '50 sedan. I know that the car R&P gears are different from the trucks. But..., do the rear ends set up for powerglide cars use the same R&P gears sizes as the manual cars or do they use the truck-sized gears?

I wanted 3.55 gears and bendix brakes for my manual '50 car. I ordered a car R&P set but I'm pretty sure I inadvertently got the set for trucks. Predictably, they wouldn't fit at all in the original '50 rearend but they fit great in the donor '52 rearend that came out of a powerglide car. I think a series of mistakes (including my own) has luckily resulted in everything turning out even better than expected but I'm just trying to figure out what happened.

-Dan