I just did this on my 88.
you should look at the parts list on my post auto to 5 speed conv,
but this is what I needed:
manuel trans
clutch
master cyl
manual pedel set. ( its easier to swap the whole thing than to add the peddel and stops inside the truck.)
clutch hard lines
6" soft clutch line
slave cyl.
shifter
driveshaft shorting/ lengthing if applicable. Mine I had to do this but Yours you prolly wont.
get a wire connector splicerfor the neutral/park wire
wiring diagram of transmission
8 hours of time
trans jack
long extension like 3 feet. for bolts at top of tranny.
new tranny mount, might as well.
nos flywheel bolts
flywheel ( resurfaced)
the auto flywheel is signifactly thinner than the manuel.
a few bolts for the flex plate ( metric)
grinder to cut a hole in your floor.
that about it.
good luck and if you need help email me at bnbullio@olemiss.edu