[makemeknowit]

While 37s would be sweet, the accompanying upgrades for peace of mind are quite pricey and out of reach. 35s on the other hand are doable very soon, new gears on the other hand are not. After wheeling on the stock tires I can't imagine there being a tremendous loss of "gear" by going to 35s but retaining the 4.10s temporarily, especially with the 6spd and the 4.1 t-case. Am I wrong here?

Thanks

 

[steve&2jc's]

I ran 35's with the 410's for about a year with the 6 speed. It was fine. I swapped gears when I went to 37's.

 

[YV Rubi]

Im running 35's with those gears. Really a bear going up hills. I usually have to drop it to 4th just to keep moving. Going to switch gears real soon.

 

[planman]

I did for about 7 months on my 2 door Rubi.

It sucked--even with a Hypertech programmer.

6th gear was useless except for downhill with a tail wind.

Off road in the rocks, it sucked--even with the 4:1 transfer case. Wheeling in rock gardens sucked so bad that I considered trading my 6 speed for an automatic.

5.13s fixed everything.

I am again glad I have the 6 speed--even in rock gardens. I can use 6th gear on the freeway, and gas mileage around town (most of my miles) improved.

 

[edwin907]

My 2 door Rubicon is still on the stock 4.10 gears. I have the Hutchinson/35" Toyos as well as bumpers, spare, winch, recovery gear so it's a heavy combination.
I was set on re-gearing but after adding the Superchip Flashpaq the performance is such that only rarely do I have to downshift to 5th.
I do a fair bit of 80mph commuting in the Jeep, and the 4.10s aren't bad there, it's about 2800rpm on the interstate. Gas mileage sucks with the air resistance, gears won't change that.
I really investigated the possibility of going to 4.88 or even 5.13 gears. The Jeep runs very well on the interstate at 80mph in 5th, which is equivalent to 6th with a 4.88 rear, but it's at over 3300rpm, but not really a problem with the little V6.
The difference between 6th in the manual and OD on the automatic is astounding. A buddy regeared his auto to 5.13s with 35s and he now runs about 100rpm more than me on the highway!
Another guy put 5.13s in his 6-speed with 35s, compared to mine he has essentially lost 1st gear on the street, and doesn't have an OD for the interstate now. But it is great offroad and his 4-HI is terrific.

I am still torn between regearing to 4.88s, or keeping the 4.10s and going with an atlas 4-speed case.
I would like to do both, as there doesn't really seem to be a downside to the 4.88s even for interstate use.
Unlike Planman, I really don't do rocks, and I do a lot of 80mph interstate miles, and secondary 65mph, not as much in town.

 

[BADGER]

I have 35s and the stock 4.10s on my 2-dr Rubi, and did a bunch of calculations before doing so.

In a nutshell, going from 4.10s/32s to 35s is the equivalent of having 3.73s in the axles. In other words it's like having 32s with 3.73s, which a lot of JKs like Xs and Saharas already come with from the factory. Granted the 35s are more unsprung weight and rotating mass, but it's not as dramatic as some would have you believe. To return to a near factory ratio with 35s, you'd hypothetically have to go with 4.56 gears.

From a crawl ratio perspective, moving to 35s on the stock 4.10s changes your overall crawl ratio from about 73:1 to just shy of 69:1. With a first-gear ratio of 4:46, you're still far ahead of your buddy's stock automatic Rubi crawl ratio (with a first gear ratio of 2:84) and WAY ahead of anybody with the standard 2.72:1 transfer case, standard or automatic, even if they've re-geared fairly radically.

Yes, you can tell a difference. You'll be in sixth less and shifting more on the highway. You'll feel the unsprung rotating mass on acceleration and on hills. But it isn't anywhere near as bad as some people make it out to be and perfectly livable in my experience. In fact, I don't even think I'll be re-gearing at any time, I like the 35s and 4.10s just fine and have not encountered any problems on the road or off.

 

[beagsjeep]

i have 35' s with 4.10 gear..not tooooooo bad..in soon future will up the gear .

 

[BeerMonkeY]

i run it, not the best but liveable. i really dont have any problems wheeling execpt some obsticals i cant idle over anymore and haved to give it a bit of gas

 

[jeeperjkj]

In a nutshell, going from 4.10s/32s to 35s is the equivalent of having 3.73s in the axles. In other words it's like having 32s with 3.73s, which a lot of JKs like Xs and Saharas already come with from the factory. Granted the 35s are more unsprung weight and rotating mass, but it's not as dramatic as some would have you believe. To return to a near factory ratio with 35s, you'd hypothetically have to go with 4.56 gears.

This was my thought process, too. I'll be doing the 4.10/35's here soon and I'm pretty sure I'll be fine with it until I can afford D60's.

 

[Wrangling Steel]

I have had no problems running this setup, but I live in the flat lands, and my 15" aluminum wheels with C range tires might have a little to do with this... I have had no real issue with it off road either, granted you can feel a difference on slow crawls, but the good by far out weighs the bad...

 

[Goodysgotacuda]

I'll be doing 35s, 6spd, 4.10s here soon. I plan on a superchips as my only other "performance" mod to maybe even the playing field some. I have doubts that it will be "too bad" for me to handle, it is not a real extreme tire size change. But i do not have personal experience so i cannot say for sure like some can.

I think some really harp and are looking for big changes when going with a bigger tire. Rather than remembering why you did it in the first place. Ground clearance, traction, approach/depature angles, etc, etc.

Given the off-road advantage and the on-road disadvantages, I'd say it will even out...

 

[BIGCAT]

I had 35's on my 4dr 6spd. Ok if you were totally empty cruising around town, but in TX the speed limit on freeways or even 2lane hwys is 70mph, therefore it was a complete DAWG on any type of incline and I couldn't effectively tow anything over 1k lbs. Kind of sucked. Switched to 4:88's and all is well. I want 37's now too, so if you are contemplating wait for the gears & get 37's ..... I'm not sure I will be gappy with 4:88's & 37's.....might try swapping 37's for 35's with a buddies cheap before deciding that 37's will work. It's easy to notice the immediate change.

 

[BIGCAT]

I had 35's on my 4dr 6spd. Ok if you were totally empty cruising around town, but in TX the speed limit on freeways or even 2lane hwys is 70mph, therefore it was a complete DAWG on any type of incline and I couldn't effectively tow anything over 1k lbs. Kind of sucked. Switched to 4:88's and all is well. I want 37's now too, so if you are contemplating wait for the gears & get 37's ..... I'm not sure I will be gappy with 4:88's & 37's.....might try swapping 37's for 35's with a buddies cheap before deciding that 37's will work. It's easy to notice the immediate change.

I forgot to mention that I went with a D rated tire. Which is much lighter than some of the E rated mud terrains. apples to apples.

 

[Stickdude]

4.10 Blues

I'm running 4.10's on 35's and do not like being that long legged. I have to use 5th and 4th on any kind of hill. I' trying to get 4.88's, as I'm staying on 35's with this Jeep, but the back set has been on back order for a month.

 

[toadontheroad]

I just added 35's and it does suck on hills. 4th or 5th to make it up. mileage has dropped almost 2 mpg. But I still have my stockers for around town so that'll help. Next week I'm running the Rubicon and I'll see if there's that big a diff on the rocks...

 

[AnkurGT]

I'm getting my rig back today with 37" KM2s on it, but still the same 4.10 gearing. I wanted to check it out before I made another expensive mod. From what I hear, some people are fine with it, some are not. I don't drive fast anymore (too many speeding tickets in my sports car days), so I'm hoping this setup will be livable... I'll let you all know!

 

[Jason @ Warrior]

Our 2 door has 3.73 and 35's, and our new 4 door will have the same. It wasn't too bad. Got the best mileage out of any of the 4 or 5 JK's we've had now.

 

[edwin907]

You know, I really don't mind downshifting for hills, from 6th to 5th. It's a manual transmission, and with 4.10 gears, 35s and the 6-speed it's like a 5 speed with an OD. I've owned/driven many vehicles in the past that required a downshift for hills on the highway, heck, my brother's newish Tacoma does, most of them do. My 454 ''vette doesn't, but it's certainly an exception.

The alternative is a set of 4.88s which would be exactly like driving in 5th with the 4.10 gears. I just don't think I want to give up my relaxed interstate cruise RPMs of 2800 for a busier 3300. Also, shortening the legs of 1st gear too much won't do anything to help driveability on the street.
I do wish for a better 4-HI, like you get with 5.13 gears. That's why I'm very interested in a 4 speed Atlas transfer case. The stock Rubicon transfer case sometimes has me wanting a lower ratio, or a higher one.

It's really a shame Jeep didn't offer a 5 speed auto slushbox with the 3.8, properly geared, it would be a terrific combination. It would have been the ideal setup for Jeepers that don't like to shift gears, on or offroad.

 

[AnkurGT]

Pissed - I didn't get my jeep back - shop didn't finish and now I'm jeepless for the weekend!

 

[AnkurGT]

Just got my jeep back today - and I'm not sure I'm convinced that I need lower gearing with my 37s. Granted, the thing can't really get out of its own way bone stock with 32s, but with my Flashpaq, Airraid and Poweraid, and the pending catback install, I think I'll live. Besides, the pinion head on the D44 is already small enough - no need to make it smaller.