I recently purchased what I believe to be a '34 pickup but was given a bill of sale for a 32.  How do I tell what year the cab is?  Also, I've recently been able to obtain a few more pickups and closed cars but don't know what years they are, all Fords.  Does anyone have an internet site that shows how to tell what years these great old cars are?
Are all the frames the same from '28 thru '34?
One more thing, are the pickup frames the same as the cars?
Thanks, I appreciate any help you might be able to offer.  

Very generally speaking the 32-34 look the same at first glance but the 32 is slightly different and the least common. f you have these parts: Does the radiator shell resemble the 32 Ford passenger car? Is it vertical? The other years have a slightly different shape (the roll coming out of the opening and over the top is flatter then a 32)and lean back slightly. Hood sides on a 32 resemble the 32 passenger car, front edge is vertical.

The rib that runs across the back of the cab is different on a 32  as the later years only had one small rib above a wider rib. (Please correct me if I am wrong as this is from memory and I don't have photos on hand)

Best bet is to examine the data plate and serial number. Ford overlapped production and it is possible to have a "32 body" titled as a 33 and a 33 titled as a 32. Commonly speaking Model "B" was a four cylinder 1932 MODEL YEAR (but could have been built in 31 or 33), Model "18" means V-8 power, Model "C" is a four cylinder 33/34

Frames for the 28-31 passenger car and light commercial are the same, 32 is unique, 33/34 light commercial are different then other years and the passenger cars (passenger car frames were "sway backed" while the trucks remained flat)the same. The reason the term "Model" is used is Ford wanted to produce the same basic engine/frame package for a number of years, thus each design spec frame/engine was a "model".  

Oops! I was close to correct in regards to the number of ribs on the back of the pick up cab bodies.

The 1932 had TWO ribs that matched those on the doors.

The 1933 and 1934 had THREE ribs. Two matched those on the doors (as on the 32's) and above those was a thicker rib.