[QUOTE=Gusaroo]Your right Bob...
How about these New Process MY6 4 Speed Overdrive
Anyone ever use one of those?

I've never used one, but they might be a good alternative. The big difference between the MY6 and GM "car" transmissions is that the MY6 has a truck sized 5.125" IBR vs. the 4.680 IBR used on cars. You'll need a "heavy duty" bellhousing from a truck. Here's a couple of good sites:
http://www.inliners.org/cgi-bin/ulti...c;f=2;t=000453
http://www.slantsix.org/articles/4-s...fourspeed1.htm