Bulldog, take a look at the thread titled
"Adding a IFS to a 37 1/2 ton"
which is currently running in this forum. A link to site describing one such project is listed there. Also see
Wayne Osborne\'s writeup for another good description.
This swap is some work, but if you want to have a truck when you're done, rather than a car that looks like a truck, it's the best way IMO.
Note that while the basic installation of the suspension is a bolt-in, there will be some welding required for things like motor mounts.
Joe
