The 35-40 ford passenger car frames are also the same as the 35-41 ford 1/2 ton pickup frames. Car frames were changed in 41 but the pu frames were'nt changed until 42. The inner frame rail /x-member on the pu frames was one gauge thicker metal than the outside frame rails. Passenger car frames were the same gauge for both inner and outer layers. Convertable frames were like the pu frames but in addition to being riveted together they were also spot welded together making them stiffer. Passenger car frames had 2 body mounting brackets on each side riveted on the outside of the frame near were it kicks up over the rear end.