[Captainfab]

An external trans cooler can keep the trans fluid too cool. The trans fluid being too cool is not good either. it needs to either be run thru the radiator to help in cool weather warm up, or run with some sort of a thermo switch/valve to create some heat.

A 6cyl will likely need a slightly higher stall converter than a V8. I would suggest a torque converter for a 6cyl even if it is a V6.

The biggest challenge with installing a 700R4 behind a 6cyl is setting up and adjusting the TV cable to produce the proper line pressures in each gear. To my knowledge there are no TV kits available for the 6cyl stock carb. You will likely have to fabricate something. If the TV cable is not setup and adjusted correctly, you will burn up the trans in a short time.