Let's see, I run a 91 Mustang radiator, under the hood, with slim electric fans. I would Imagine a Ranger radiator would work, with the Mustang radiator there is no room for A/C lines, and it doesnt get any air flow on the sides because of the front of the truck, so I'm thinking it's useless running a Mustang rad.
There were problems with the shifter, I'd reccomend a cable shifter, if you go auto.
if you're 4wd, then you might have some issues with the xcase shifter, i had a few, and a custom front driveshaft. I'm still waiting to get mine made...
Only major thng I can think of off the top of my head at the moment was cutting and boxing the frame to clear the exhaust.
Nick Conforti - 1987 Ranger XLT - 302 - Cam - Edel Intake - Edel 650 4 Barrel- GM HEI - AOD - D28 - 8.8"- Discs - 31 Spline - 3.73 - L/S - 30" - Sony Headunit - Kicker Components - 3 12" Audiobahn 1251T @ 35Hz - HFi1000.1D Mono Class D