[68c10owner]

Try to find a 1987-up trans. The earlier ones have a smaller input shaft and have weaker internals than the later ones. And you have to be careful what you pull it from because some vehicles had a electronic speedo and might not have a mechanical speedo drive. This can be converted but its a added expense that can be avoided. There are several places that sell the 700R4 outright so that might be a option for you.