[Dieselwrencher]

Typically, the stock torque converter starts to slip, that with low line pressure and plastic servos, and weak band anchor and strut, something usually breaks, clutches start slipping, and it quits working. So, you can pull the pan and look at the valve body to see if any of that has been upgraded. If not, a good shift kit or just a pro built valve body, some hard parts you can install, and maybe a billet input, and you can have a sweet trans to do some dumb stuff with. I have one in all my conversions I own currently. You can get a compushift mini to control the over drive and lock up and they are relatively cheap too. It's hard to go fast in a 5 speed and in stop in go traffic, that garbage gets old. That's coming from a gear jammer. Haha I had a NV4500 in my 72 and pulled it because I wanted to go fast too.

That means your engine is more than likely a 160. If it's an 94 or early 95 it will have a WH1C on it. I can tell you some things to check on it and or do to it when you get there.