gear ratio swap

Can't run aux cooler, no room. I already have a condenser in front of radiator. I thought the hi stall was looser than 1800. I think the Fairbanks converter I have is still a 11" converter. It acted the same as it does now when I had 3.55's. Creeps away at an idle, barely have to give any throttle. I'll probably try it and see what happens. Might have to swap with my old man, his is a 340 car with a really tight converter I use to have. Might be 1200, pulls when put in gear.