i'm thinking on swapping in a 3rz in my 79. what would be the most useful rig to use for a donor rig? and if i end up with left over parts.. tranny's, diffs, ect. would any of these parts be worth it for resale. i've found some 2wd and the 4wd for more. what route would you take?? if i go this on my own i'm sure i'll spend more $$ than is required.