I have the AA 4:1 gears. As noted above though, the hi range is actually a 10% underdrive. I have an H55, and 4.10 gears in the diffs, running 35's. I love this combo. I rarely use 1st, it's low enough I can get out and walk very slowly alongside. 3rd low range is usually what I start off in and it's pretty versatile.