The GM subframe swap is pretty much 80's tech and while it drives great It isn't all that easy and the cost can go up if you have to rebuild the front end. The cost for decent subframes seems to be a lot higher now too. In the early 80's we could often drag a tired Camaro or Firebird that someone had junked out off for spare change if not free for the taking. I think I split one with my buddy and he took the rear axle and I took the subframe and we scrapped the rest. There wasn't much to scrap though.
I hung that First generation rear steer subframe on my 48's frame and rebuilt the suspension along with adding disk brakes off a 72 Monte Carlo.
The big hassle was trimming out the inner fenders and getting the front end sheet metal lined up right.
When I was done the truck drove like a slot car and we made a trip to Texas in it leaving Washington with less than 100 miles on the fresh truck.
I don't plan to use another one as I'd rather keep the stock frame intact and add the suspension to it.
I've got an aftermarket MII crossmember and tube A frames to go under mine but haven't got it welded on yet. I've rather mixed and matched and am using stock MII spindles and springs on the build but I already had two stock MII suspension setups stashed away.
Right now with what I know I would be looking for a Jag XJ6 suspension that some of the guys on here are installing. They aren't that expensive in some areas, come complete from hub to hub with steering and install fairly easily on AD trucks.
They may not be the prettiest or showiest when the nit pickers look under the truck but those cars weigh the same or slightly more than an AD truck and they do drive pretty nice. Depending on the number of Jags in the area over the past 20 years they may be hard to find in some areas though.
Scroll down this page, We lost Steve (OldSub) a couple of years ago but his ideas live on.
http://67-72chevytrucks.com/vboard/s...d.php?t=414496