The '53 to '55 1st series axle should bolt into your truck.
I did the bendix brake swap on my '52 3/4 ton axle. I used my original hubs. I believe the 3/4 ton axle and spindles are the same part number from '46 to '52, so you should be able to do the same thing with yours, but I would confirm the numbers with a parts manual first...I don't have mine handy right now.
