Bill - If it is a '49 axle housing, the brakes should still be original "Huck" style (no self-adjusters) which would use the same style parking brake actuating hardware under the drums. I haven't been able to check the actuating hardware between the '46 and '49 axles in the Chevy Master Parts Books, but since they are both the "Huck" style, they may be the same and could be the '46 rear parking brake cables will work with the '49 axle.
If I get a chance tomorrow, I'll see what I can find more on the actuator parts and cables. In the mean time, perhaps you can post some pictures of the rear brakes, backing plate, etc. so we can see for sure what you have?
