I have a 42-48 axle under the front and rear of my '36 coupe. The front axle, 2" drop, '41 spindles, '36 wish bone, '42-48 spring, '40 steering gears with a '36 pitman. The front shocks are tube type using an aftermarket adapter kit.
The rear axle is a '42-48 Columbia, '36 banjo/torque tube, '37-39 radius bars, 47-48 spring, tube shocks with the '48 style of panhard/sway bar..
I opted for the later model front axle because a dropped axle is generally narrower than stock, which make the front wheels look funny being set in from the fenders. The wider rear axle is not that noticeable with the position of the tires in the fender opening..
My tires are 600 x 16 on '39 wheels/drums .. '42-48 brakes front and rear... The next time I buy tires they will be radials..