MDL, Modern Driveline, was interested in building a kit to convert Gen 2 Broncos and 73-79 P/U trucks to a Tremec 4050 5-spd transmission. The 3rd gear in my NP435 was toast and I was looking for a replacement. In conversation, they offered me the chance to have one installed while they developed the kit to do it. So I was the test Mule. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.