Hello all from sunny (and HOT) South Dakota. I have a 1949 F1 with a flathead 8 and a 4 speed transmission. I love my truck but HATE the transmission. What other transmissions will work behind the 239? Years ago I had a '49 F1 with a three speed on the floor. It was syncronized and a joy to drive. I'd like something with overdrive, I've heard there are 5 speeds that will fit without too much effort. Any thoughts?