I'll admit upfront I'm a newbie and if I'm in the wrong forum - please forgive me and point me in the right direction. I inherited a 1981 Heald Hauler 3 wheeler from my Uncle. I've been using it around my property and yesterday it stopped going forward, reverse works. Thought it was the belt which looked like it was slipping ($40 on a new belt and that wasn't the problem!). I now see that when in forward gear the rear pulley that connects to the transmission just spins (the shaft into the transmission spins also) In reverse it locks in place and away we go. I'm guessing that there is a problem with the transmission - is this something that is serviceable or can be replaced with a newer transmission?