My understanding is a gasoline transmission isn't capable of dealing with the higher torque of a diesel engine, Also the gear ratios are not ideal for a diesel RPM range, You'll want a really good body to go along with the high degree of work doing an engine swap. Indeed it has been recommended to me as I'm considering which diesel engine and tranny combo to install in which chassis, then pick a body.
Brian

Brian Rodgers
Internet traffic relayed through DIY solar powered WiFi tower.
www.outfitnm.com
1989 Isuzu Pup gasser
2-86 Isuzu Trooper turbo diesels (1 good 1 bad)
Many gallons of biodiesel since 2005