The original automatic transmission was a lemon. I had to have it rebuilt at 70k miles. It went out again about 14 months later. Both time reverse quit working. The engine crank shaft came apart at 85k miles. I replaced the original transmission with one from a 93 Chevy car, and I replaced the engine with a 4.3 from a 92 Chevy S10 truck. Both have performed flawlessly for over 100k miles. Can't keep the Air Conditioner going - eats compressors regularly.
Lots of power - good springs and shocks - toes and pulls heavy loads easily. The van gets reasonably good gas mileage, 20 to 24 depending on how it's driven. Since replacing the original engine and transmission, it has been a very dependable vehicle. It's very roomy. I can remove the two back bench seats and haul 4 x 8 sheets of plywood easily. I'll probably keep this vehicle indefinitely.
Change your orifice tube and a/c driver.