'32-'34 was behind rear axle with a curved spring, '35-'48 is behind with a straight spring. '35 was the first year that the spring was moved infront of the front axle.
Example of 1932 with curved spring. You can also just make out by looking at the bolt circle where the backing plate attaches how the 32/34 axle housings where "clocked" a few degrees.
