I have a 65 Cutlass vert with a 350 and the original Jetaway transmission installed. I have a leak (turning into a small stream) from the speedo drive gear. Everyone I have contacted so far says there are no parts available (in Canada). My question is, do these parts (housing, gear (black plastic) and seals) interchange with a th350 or th400 transmission as these may be more available? Thanks for any help.

My problem has been resolved, the speedo drive gear from a th400 transmission is the same as are the seals. Hopefully no more red spots on the garage floor.