I am thinking on putting a transmission in an acquired van me and my dad got, in turn maybe scoring his 87 B2 4x4 auto. If I did this the poor ol 2.9 is old an tired with a known cracked head or two, what would you do to make it a capable trail rig without too much cash in it, I know a 4.0 and 8.8 and 35, but that stuff aint cheap around here....