My truck is a U14L 3G81 with 3spd trans. Hydraulic scissor lift and dump. I have check the manuals that Dan has posted and couldn't find what i was looking for. Pulled the trans out and it had no oil in it. the bearing on the input shaft was in pieces. there are also some teeth missing on the gear selectors. I'd like to unlock the 4th gear. Wondering if i'd be able to do that by ordering the gear from a 4spd because the one in mine just isn't cut. Would it be worth it rebuilding this trans or just finding a 4spd ready to go. 2nd problem is the hydraulic. the solenoid which i believe controls the flow of fluid wouldn't do anything when i applied power to it. so decided to tear it apart, while i was removing it i noticed that someone has been inside it before. inside the manifold was a cone spring and a small rod just sitting there. So i'm not sure how its supposed to go back together.