my biggest issue its the engine breaking and the engine easily stalling out on rocks and roots and stuff. i can be on thottle and out she goes, i don't want to ride my clutch though.

 

I know you said you can't afford them...and you probably don't want to hear this....but save up and re-gear, it's the single best improvement you can do for what your looking to achieve

 

I debated this myself, and ended up getting gears.

A used x-case from a rubi is at the cheapest about $750 USD on carparts.com + shipping. Tack on $50 minimum.

That's pretty good, but for me 95% of the JK driving is on pavement and the benefit from gears is all day everyday, and it improves your crawl ratio which is definately noticeable.

I was hoping for a mileage increase but mine actually went down with 5.13s. I used to be in the mid 13s and now Im in the 12s. Oh well.

 

Can someone please explain to this newb how regearing from 3.73 to 4.88 would increase MPG? Wouldn't this increase RPMs at cruising speed? If so, wouldn't that decrease MPG on the highway? Thanks!

 

As far as I understand it would only help city milage. I have 35's and 4.10, and I have to rev the engine up just to keep it from stalling or destroying the clutch. I'm planning on regearing after new years, I can't decide between 5.13 and 4.88

 

RCJeeper, did you recalibrate for the new gear ratio and larger tires? I bet you gained more MPG than you think.

 

x2

 

Take a look at the chart at the bottom of this FAQ:

https://www.jk-forum.com/forums/show...76&postcount=4

The problem is that increasing tire height lowers your rpm's, taking you out of the part of the power band that this engine likes. If you have a manual, try cruising around in 6th at 30mph and see how it feels. (Or get on your bike and pedal up a hill in your highest gear instead of the lowest.) It bogs down, and you need to give it a lot more gas, right? This has the effect of bringing your mpg's down drastically.

Lower ratio gears (higher numerically) just bring us back up into the sweet spot of the power band. Back to a 'stock' ratio.

 

Going from 3.73 to 4.88 gear ratio will increase your RPMs if you stayed with the same tire diameter. On the other hand, if you installed a larger diameter tire and kept the same gear ratio, you would effectively increase you gear ratio (lower numerically), resulting in a loss in performance. Regearing is normally done after installing larger tires. The objective is to get the gear ratio back to stock or even lower (higher numerically) to maintain performance. Check out some of the gear ratio/tires size charts to give you a better idea of what you need.

 

If they would increase the ratio from 1/2.72 to 1.1/2.72. That would allow us with 3.72's get roughly 4.10's out of our daily driver plus the off-road updgrade.

For those of you with 4.10's you would get 4.5's. If they went to 1.2/2.72 it may be to much of an increase for the daily driver, but I could live with turning my 3.72's into 4.46's.

Do I hear gas savings?