Pinto's had C4s, but they were rare. If you can find a bell housing for one, the C4 will bolt right up, but good luck finding one. I looked into this a while back. The stall convertor is a problem. You actually have to use a stock convertor for a Pinto with a C4, which can be bought new, or you have to have machine work done to the back of your crank if you want to use a convertor for a 5.0. If you use a convertor for a 5.0, there are all kinds of options available off the shelf. You could really have a lot of fun. I am wondering if something can be done to a 5.0 convertor to make it work, without disassembling it. I can do machine work, but I can not disassemble convertors. There is a guy that reworks and sells Pinto convertors, but he is not cheap and will not sell them outright. You have to provide him a core. Jeffrey, Even if you could, I would not run an AOD with a 4cyl. They eat a lot of torque. Your truck will be a slug unless it has a turbo, and your gas mileage will drop significantly. If you have ever picked up an AOD, you know it is a beast. It looks more like something that belongs in a bus than a pickup. A c4 is strong, cheap to purchase as there are so many out there, and cheap and very easy to rebuild. It has been a long time since I have looked into this, but if anyone is interested I will track down what information I have relating to the specifics of what's needed for a complete c4/2.3 combination, and what options there are. I have not done it yet, but I think I know what I need to to get it done. I have bits of information I picked from various places all compiled somewhere, just got to find it. Better yet, maybe somebody here has done it and knows off the top of their head what is needed. If that be the case, I think there is enough interest in this to warrant putting together a complete write up for the tech library or something. One of these days, I'm going to stop talking about this and do it. Jeffrey, what has been rebuilt 4 times, the a4ld, or the AOD?