Slow down man ! If I remember right the gears and shafts are the same in the gas tranny. Gas troopers can be found on craigslist CHEAP with a blown head gasket. The difficulty here is that the bellhousing is the front half of the transmission case too.
Use a gas tranny for a guts donor.
The s10 or s15 diesels had a borg warner trans, this is the one with the separate "bellhousing".Rare

Have you done a compression check yet ? A leaky turbo seal is hardly a reason to throw it out either.There Was a turbo+manifold on fleebay for $99 last week.
Or you could go non turbo.
http://cgi.ebay.com/ebaymotors/ws/e...=&item=320263269830&rd=1

Do a proper compression test on that thing, if it cranks and doesn't knock,then check the oil pressure with a manual gage... should be above 50psi @cold idle.