3-speed

I guess I am not up to speed on what 3 speed changes might have been made from 60's models to the '72 that you have, but I can say that those early 3 speeds were WEAK. I don't know how many low gears I broke before I switched to a torqueflite. you could break the low gear slider without blinking an eye. Once I broke one when I clutched to go over a speed bump, when I let it out to creep up on it with the rear wheels it sheered the teeth off like corn off a cob.