A little correction regarding the gears to tire size and speedo correctness.
1st 5.29s are spec'd for 35" tires. 37" tires will work fine with them besides the dropping to 4th on hills.
If your running 5.29s a single case and 37"s when say doing fordyce or con your gonna be on your clutch a lot.
5.29x2.28x3.93=47.4 crawl ratio
A 47 ratio is fine if your running smaller tires.
Now if you add a second tcase with stock gears you get this:
5.29x2.28x2.28x3.93=105.6
This ratio is MUCH more suited for a trail/dd rig. but still imo not nearly good enough to push 37"s on the trail.
As a rule of thumb the ideal crawl ration for a trail rig is 150-180. I would say if you plan to wheel some of hard trails this summer then going dual cases with 4.7 gears im rear case would make it a lot less stress on drive train and your left foot.
W/ 4.7 gears
5.29x2.28x4.7x3.93=222.8
Also when people refer to crawl ration the including my calcs about are using 1st gear. You be surprised how often you'll be in 3rd gear as main crawl gear with dual cases and 4.7 rear.
I am running dual cases with marlin 4.7 rear case gears and stock front. Basically the last calc above. My rig is more then fine on tires up to 40"s but ive also built everything else to handle bigger tires and extreme trails. It takes money but in the end its well worth it. Mainly your not being towed out of the trail by your friends who still wanted to keep wheeling.
