For your setup, the 4.88's will give the best overall performance with a manual.

 

Thank you everyone on your input I believe I will go to 4.88 gears before I get tires. I do know the difference when it comes to this, I use to run 33" on my Sahara with 3.21 gears and was doable. Now that I have my Rubicon its night and day difference from 3.21 to 4.10 gears so I will change gears first.

 

Honestly, you might swap on the 37's and see how it does. Shouldn't be miserable with a manual.

 

+1 ^^^

I’ve been running 37 Nitto Trail Grapplers on 4.10 gears now for 3+ months now on a ’13 4dr automatic. I thought it would suck pretty bad, but it’s really pretty livable. It’s definitely not ideal, and there will be a gear change at some point in my future, but it’s not as bad as many would lead you to believe. The only time I think it really sucks is trying to do 80+ mph in to the wind on longer road trips and it’s constant shifting till you finally just take it out of auto. I have a 30 mile commute that is mainly interstate driving (70mph) and it’s not that bad. I would say purchase the tires first and drive with them for a bit. On the slight chance you end up not liking them you can always sell them and move back to 35’s. If you like them then move forward with a re-gear when possible. You might be surprised and find that you can live with it for a little while giving yourself more time to save for a re-gear. You will need to trim your pinch seam in the rear and adjust your steering stops up front. If you’re goig with a 12.50” wide tire like the Trail Grapplers, you should be fine. If you’re going with a 13.50” tire you might need spacers depending on your wheels. If you don’t already have them, gussets (as mentioned above) and upgraded ball joints will be in your near future.

 

That's not bad what about highway driving and having to go up hill? Even now I sometimes have to shift to 5th gear to maintain 75 mph.

 

I ran my 37s with 4.10s at high altitude (Colorado), for about a year. Jeep's a manual. Then I swapped out to 4.88s. Even wheeling up high on 4.10s is doable. After changing to 4.88s, it brought back the "normal" feel to a degree and driving in 1st gear at 20 mph was a thing of the past.

 

I've got 5 years on my 2010 6sp and 4.10s. It does fine around town and on the highway. I tow a popup a few times a year also and it pulls just fine.

 

Wow that is interesting how about crawling over rocks? I imagine it shouldn't hurt it.

 

I'm in DFW area so not climbing mountains or anything, but it's fine as a daily driver. Again, it's not "ideal", and I plan on a re-gear at some point, but it's not as bad as it might be in your head. I wheel it fairly hard and it does fine climbing the rocks. I have not noticed any sort of drop off in wheeling since putting them on......the only thing that is noticeable is making it over some things I couldn't previously on 35's! I go to Colorado to visit family but have not been since moving to 37's. i would expect a drop in performance for sure in more extreme conditions like that. (again, 3.6L, 4dr, auto with 4.10 for reference)

 

I run 4.56 on my '13 auto with 34" tires and it's perfect. With 37's regear man. I'd recommend 4.88 or even 5 something or other