On a factory 4 speed trans in a 50 3600 what holds in the speedometer driven gear? It's caked with grease and I can't see if there is a clamp or if it is necessary to remove the housing on the rear of the transmission. It's sunk into the ground but if it's not necessary to remove the housing I can work through the top and not have to drive my s-l-o-w forklift two miles round trip. In 60 years I have driven many with the granny low but never worked on one---guess they score high in reliability. Thank you;