I was gonna run 37s on dana 44s, but my wife actually talked some sense into me... She said "If you're gonna swap axles, why not just go to 60s and do it right?" She doesn't like when I break my rig..
37s can work on true dana 44s, but if you wheel really hard, and want extra peace of mind, go 60s.
My ride- 2001 power wheel, 11" plastic tires, upgraded battery, boat sides, custom bumpers, tow hooks, new paint.