seer1

We just finished discussing a similar topic here: https://www.jk-forum.com/forums/modified-jk-tech-2/building-up-d30-regear-4-56s-72031/
My Unlimited W/auto, 4.10 hated 33's. I can only imagine what it would have to say about 35's. And do get the Procal.

nclehmann

The answer to your question depends on the use of your JK. If you wheel it hard every weekend and have a second vehicle as a daily driver, I would recommend you regear as there is a noticeable difference in power, especially when wheeling. However, if you are like me and use your JK as a daily driver, don't wheel it very hard and occassionally (once a month or every two months) go wheeling, then there is no need to regear, especially if you have a 6-speed.

I plan to get 35s this summer and will not be regearing. We have a place in the mountains about 3 hours away and we go every weekend. Driving on the highway for 3 hours at 70mph with 5.13s sucks. I'd much rather have 4.10s for long distance driving. I understand that I'll have to downshift to 4th or 5th gear to go up long stretches of uphill highways, but that's fine. My wheeling consists primarily of loose gravel, dirt roads and muddy trails. Not too much rock climbing, except for certain areas in Uwharrie National Forest.

Hope this helps.

wiredawg_mg

5.13s are a little deeper with 35s than the 4.10 are with 32s. So the end result is a little more low end umph. You will turn a couple of hundred rpms higher at highway speed and you will still need to correct the speedo

seer1

It's amazing to me how different the A/T vs the M/T is when it comes to differential gearing.

nclehmann

Hijack begins.

I think much of the difference is perceived. With M/T, you shift when you want to. In other words, you squeeze whatever power there is until you feel you need to shift. With A/T, you're at the mercy of a computer that is programmed to shift at specific engine revolutions (or whenever it wants to).

I've only had 1 A/T vehicle in the 22 years I've been driving and I hated it. Sold it after a year.

Hijack ends.

Pwermker

I have 35" Dunlop mud terrains on 16" steelies and a manual on my 07 X and you can tell the difference but not that bad. Oh, also 4:10 gears. You guys running 3:73s' or less it must suck.

m(a)ce

Tangent Q:

Would there be any correlation between running a Mud vs. All Terrain?

I mean I understand diameters are similar so I don't think it would be night and day but it as far as rolling resistance/weight/etc would it make a difference? From what I've read the All Terrains get better mileage and wondered if anyone has noticed a difference.

Moreover - what about wheel weight & its impact? (steelie vs. al)

0311sgt

The difference is not just in how you ar the computer shift. yes that is a factor but the big difference is in the GEARING of the tranny......
Auto Tranny...
2.840:1 first gear ratio,
1.570:1 second gear ratio,
1.000:1 third gear ratio,
0.690:1 fourth gear ratio,
2.100:1 reverse gear ratio,

Manual Tranny....
Gear Ratios 1st 4.46
Gear Ratios 2nd 2.61
Gear Ratios 3rd 1.72
Gear Ratios 4th 1.25
Gear Ratios 5th 1.00
Gear Ratios 6th 0.84
Gear Ratios Reverse4.06

so you see the how much lower first gear is? here is a link to help you decide what re gear to run....
http://www.angelfire.com/fl/procrastination/rear.html
Good Luck

07 JK Unlimited
3 inch BDS suspension lift
33x11.5x16
JKS Quicker Disconnects
Warrior Products Tube Doors
Mopar Off Road Rear Bumper
Oil Pan Tranny Skid Plate by SkidRow
Custom Front Winch Bumper by RoundStar OffRoad
Skyjacker Adjustable Rear Track Bar
Skyjacker Brake Line Extenders
Rock Krawler Adjustable Front Lower Control Arms
Dual Steering Stabilizer from Rough country
And Plenty of "CHARACTER" From rocks and Trees
“A bad day wheeling, is better than good day in Prison!”
^ YCP 4X4 motto ^

lear60

thanks everyone

nclehmann

That's a great link.

With a M/T in 6th gear at 60mph, the RPMs are:

4.10 gears with 32" tires = 2,200
4.10 gears with 35" tires = 2,000

5.13 gears with 32" tires = 2,700
5.13 gears with 35" tires = 2,500

Like I stated before, I think 5.13 is too much if you regularly drive on the highway at speeds over 60mph. 4.56 would probably put you back to stock, but I think you'd be fine with 4.10s and a manual tranny.