It has been used as a flat bed up until last month. I bought it from the school that i go to for 250 and they bought it new in 66. I looked at the rear end and I could not see any signs of a shifting mechanism is there anything in particular that I should look for. It got stuck in first when I was driving it home. I was downshifting and then it got stuck and would not come out. It is a four speed tranny. Any ideas?