I've been thinking about putting a four speed transmission in my rig sometime down the road and not sure which one I should be looking for. I plan on keeping my stock Dauntless 225 and D18 transfer case. I would like as close to "bolt in" as possible. My reason for doing this is to get a lower "crawl" speed. At this point, I plan on keeping my stock 3.73 axles, which should give me the highway speed I want.