I suppose it could be done, but why? Why not just pull a motor and drop it in? You are trying to get the 4dr back on the road, right?
Conversion would be a lot of work- pedal assembly, master cyl, crossmember, trans mounts, drivelines, etc.

The trucks are basically the same, so everything is there and goes in the same place. I went the other way from standard to auto.

-Dave D
Reservoir of Useless Knowledge

"But... If I kill all the golfers, they'll lock me up, and throw away the key..."
-Bill Murray

'84&change Monty MPI Turbo, choptop, f&r lsd, swapped in AT- All the goodies!