A 3-speed was standard equipment on 3100 and 3600 1947 Chevrolet trucks.
A 4-speed was a Regular Production Option on 3100 and 3600 1947 Chevrolet trucks.
A 4-speed was standard equipment on 3800 and larger 1948 and later Chevrolet trucks.
The 1947 three-speed and all four-speed transmissions had a transmission-top through-the-floor shifter - the floor cover had an opening for a transmission shifter.
1948-1955st three-speed transmissions all had a column-mounted shifter and a "flat" transmission-top floor cover.
