What gear ratio will work best off road?

WOW, this is kinda tough to answer without knowing what kind of transmission you have, what the low range is in the transfer case, and what axles you have. I have owned Jeeps with differential gears of 4.10, 4.27, 4.88, and 5.38. All had either a straight 4 or V6 engine with a Spicer 18 transfer case and dana 25, 27, and 44 axles. My best Jeep had the V6. It had a 3 speed transmission with a 3.10 first gear, a 2.46 low range in the transfer case, and 4.88 differentials with 33 inch tires. This gave me a 37.21 crawl ratio and it went anywhere I drove it. The thing I liked about the 4.88's was that it drove well on the highways because of the Warn overdrive and got decent milage.

If you have an automatic transmission you can get by with 4.10's due to the torque doubling effect of the tranny. Personally I'd go with the 4.88's and see if you can use the thick ring gear as this will give you a stronger pinion shaft due to the smaller diameter pinion gear.

On a 4.0 these ratios are the most widely used on a jeep

for 33's - 4.56

for 35's 4.88

but these are usually run by guys that also run on the street. If you still want to get some wheel speed up I'd probably go with 4.88 on 33's, but I've seen jeeps as low as 5.13 - either way you're going to have to upgrade the axles. If you still have the Dana 35c prepare to break it with your driving style, tire size and gear setup.

Them speaking approximately kit ratios is utter rubbish. the subject at 30 ought to be it being basically on the replace factor, so this is changing up and down gears, yet computerized boxes are many times "smarter" than to try this. If I had to place funds on it, then i could say this is possibly a defective spark plug (or plugs), or possibly a defective coil p.c.. inflicting a reasonable misfire.

4.88