budgetsami said:
i would say go 4.57 or lower. the reason you may go 5.13's is it might be cheaper due to the trackers have em and with a short search im sure ya could find more on it.
Me personally, I ran 4.56's on 31's and wanted more umph, as im sure you will---then i came across a deal on axles i couldnt pass---so the 4.11's went in then the 5.14 gears. my results are my speedo is 5mph slow--which is damn close to stock.
if it were me---id look further into the 5.13r/p from a tracker
I personally have 31" tires (31/13.5 swamper SX) and no R/P changes.
I have a high uumph engine with a VERY wide RPM range (from about 800 to 8000). Reverse is not too bad for me as I can spin the engine waay fast to compensate for the llllooooowwww reverse speed. Forward, I'm usually in 3rd or 5th gear on the trails in low range.
I love mud, I don't really """""""""" bog """""""" though, I'm a crawler, take it sloooooow.
The transfer case gearsets are AWESOME if you have any intentions of crawling on anything. If you have any intentions on going to a larger tire size in the future, a t-case set (4.16) would suite you well in my opinion.
With my 31" tires being soooo dam huge (you guys with the 38+ tires, don laf at me

) I am wanting more rpm for cruising. I think the calmini 5.x t-case setup would suite ME better than a 4.16 t-case for MY setup.
My final opinion. The ring and pinion setup would be best in my opinion for mudding, the gears will compensate nicely for the mud allowing the engine to stay in the power band. You'd want to over gear specifically for bogging, you need more USEABLE power.
The t-case works very very very very well and has its plusses. You'd need reinforced mounts for the transfer case if you were to go that route (more $$). If you were to buy a t-case reduction set, you would probably change your (only bogging, no crawling) mind. Going slow and conquering obstacles is fun in my opinion.
.02