35's and re-gear dliemma

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2016 JKUR HardRock Auto with 4.10 leveled out with 35” STT Pros.... drive it everywhere, even put all my gear and RTT into a military trailer and took a two week trip theough CA, OR and NV... never felt like I needed to regear. I do however, manually shift on long grades through mountains if that makes a difference to you.


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I just wanted to follow up with my experience.

After 33K miles on 33's, I recently did a bunch of upgrades (including moving to KO2 35's) prior to a 3600 mile road trip to Moab. When I asked for advice here the bottom line good advice I got was "Drive it before you consider re-gearing and see what YOU think". So I did, and I am reporting back. First off, my JKUR has stock 4.10s, and is HEAVY (winch, bumper, full underbody armor, steel steps/rock rails, and it was full to the roof on the trip--CO2 tank, tons of tools/recovery gear, heavy cooler, steel link snow chains, 6 gallons of water, 12 gallons of gas in two cans, hi lift, etc.). There are a few attempts to save weight (aluminum bumper, synthetic winch line, 2 of the skids are aluminum) but it still is heavy, especially loaded for the road trip.

My milage went up between 2.5 to 3 mpg at the same speeds vs when I was on 33's--just like gearing cars for economy versus power. Speed limits in ID and UT are 80, and I was cruising at 85 without significant problems (in fact I think the 35's help as it makes the effective gearing more appropriate). Also did some almost 10K mountain passes without issues.

Rock crawling the power seemed just fine--this includes the very steep fins on Fins and Things and Hells Revenge, as well as some gnarly sandy climbs in Lavender canyon.

Power off the line is a little less but not bothersome (and I have some very powerful cars and was a high performance driving instructor for 15 years, so I don't abide vehicles that can't get out of their own way). City milage before the trip is also improved.

Bottom line is, at this point, I have no plans to re-gear. I may never know what I'm missing, but hopefully this may reassure some who think it has to be done.

Now, 35's introduce other issues (braking is one) that aren't impacted by re-gearing that are separate considerations. (I redid both my front and rear brakes--Mopar BBK front, Dynatrac rear--freaking amazing.)

As always, YMMV.
 
64Chevy said:
I just wanted to follow up with my experience.

After 33K miles on 33's, I recently did a bunch of upgrades (including moving to KO2 35's) prior to a 3600 mile road trip to Moab. When I asked for advice here the bottom line good advice I got was "Drive it before you consider re-gearing and see what YOU think". So I did, and I am reporting back. First off, my JKUR has stock 4.10s, and is HEAVY (winch, bumper, full underbody armor, steel steps/rock rails, and it was full to the roof on the trip--CO2 tank, tons of tools/recovery gear, heavy cooler, steel link snow chains, 6 gallons of water, 12 gallons of gas in two cans, hi lift, etc.). There are a few attempts to save weight (aluminum bumper, synthetic winch line, 2 of the skids are aluminum) but it still is heavy, especially loaded for the road trip.

My milage went up between 2.5 to 3 mpg at the same speeds vs when I was on 33's--just like gearing cars for economy versus power. Speed limits in ID and UT are 80, and I was cruising at 85 without significant problems (in fact I think the 35's help as it makes the effective gearing more appropriate). Also did some almost 10K mountain passes without issues.

Rock crawling the power seemed just fine--this includes the very steep fins on Fins and Things and Hells Revenge, as well as some gnarly sandy climbs in Lavender canyon.

Power off the line is a little less but not bothersome (and I have some very powerful cars and was a high performance driving instructor for 15 years, so I don't abide vehicles that can't get out of their own way). City milage before the trip is also improved.

Bottom line is, at this point, I have no plans to re-gear. I may never know what I'm missing, but hopefully this may reassure some who think it has to be done.

Now, 35's introduce other issues (braking is one) that aren't impacted by re-gearing that are separate considerations. (I redid both my front and rear brakes--Mopar BBK front, Dynatrac rear--freaking amazing.)

As always, YMMV.
Click to expand...

Great to hear!
 
64Chevy said:
I just wanted to follow up with my experience.

After 33K miles on 33's, I recently did a bunch of upgrades (including moving to KO2 35's) prior to a 3600 mile road trip to Moab. When I asked for advice here the bottom line good advice I got was "Drive it before you consider re-gearing and see what YOU think". So I did, and I am reporting back. First off, my JKUR has stock 4.10s, and is HEAVY (winch, bumper, full underbody armor, steel steps/rock rails, and it was full to the roof on the trip--CO2 tank, tons of tools/recovery gear, heavy cooler, steel link snow chains, 6 gallons of water, 12 gallons of gas in two cans, hi lift, etc.). There are a few attempts to save weight (aluminum bumper, synthetic winch line, 2 of the skids are aluminum) but it still is heavy, especially loaded for the road trip.

My milage went up between 2.5 to 3 mpg at the same speeds vs when I was on 33's--just like gearing cars for economy versus power. Speed limits in ID and UT are 80, and I was cruising at 85 without significant problems (in fact I think the 35's help as it makes the effective gearing more appropriate). Also did some almost 10K mountain passes without issues.

Rock crawling the power seemed just fine--this includes the very steep fins on Fins and Things and Hells Revenge, as well as some gnarly sandy climbs in Lavender canyon.

Power off the line is a little less but not bothersome (and I have some very powerful cars and was a high performance driving instructor for 15 years, so I don't abide vehicles that can't get out of their own way). City milage before the trip is also improved.

Bottom line is, at this point, I have no plans to re-gear. I may never know what I'm missing, but hopefully this may reassure some who think it has to be done.

Now, 35's introduce other issues (braking is one) that aren't impacted by re-gearing that are separate considerations. (I redid both my front and rear brakes--Mopar BBK front, Dynatrac rear--freaking amazing.)

As always, YMMV.
Click to expand...


That was my experience too with stock 4:10 and 35" tires. I got better fuel economy and barely noticed the power loss unless I was climing a long grade. I will regear when I make the change to 37" tires this winter. Thinking of 4:88 but leaning towards 5:13. Otherwise totally happy with my 35" tires and stock gearing.
 
Yea, I think it’s one of those things where you don’t know until you know. I have stock gearing and 35s with beadlocks and don’t have any issue with the power output, I actually like it better than stock tires on the 4.10 gears.


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I ran 35s on 3.73s for a couple of months and hated it. Driving a manual, 6th gear was useless even on flat highway and I wore out the clutch pretty bad.


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I regear'd my Rubi to 4.88 along with additional suspension upgrades before even putting on 35's. Huge difference uphill and especially crawling over boulders in 4l only loss 2mpg, worth every penny. 4.88 is perfect for 35-38 tires, now axles, brakes and steering is another thing.
 
Ok...I have a 2015 JKU with a 5.7, 5 speed auto and 35" BFG KM2's. With the original gearing of 4.10, I took my family on a trip from Seattle into Wyoming several years ago towing my Xventure trailer...and it was a dog going thru the mountain passes. After returning, I had it regeared to 4.56, knowing I had no intention of moving into bigger tires with this jeep. I eventually shipped it to HI where I now use it as my daily driver...and in hindsight, wished I had regeared it to 4.88 instead. It gets along fine , but it's no "rocket", even with a 5.7 hemi...even took it on the Rubicon trail prior to shipping it to HI...
 
Brute said:
Ok...I have a 2015 JKU with a 5.7, 5 speed auto and 35" BFG KM2's. With the original gearing of 4.10, I took my family on a trip from Seattle into Wyoming several years ago towing my Xventure trailer...and it was a dog going thru the mountain passes. After returning, I had it regeared to 4.56, knowing I had no intention of moving into bigger tires with this jeep. I eventually shipped it to HI where I now use it as my daily driver...and in hindsight, wished I had regeared it to 4.88 instead. It gets along fine , but it's no "rocket", even with a 5.7 hemi...even took it on the Rubicon trail prior to shipping it to HI...
Click to expand...

I don't think a single person has ever said I wished I had gone with a higher gear ratio. But many (like you) have said they wished that they had gone a step or two lower.
 
WJCO said:
I don't think a single person has ever said I wished I had gone with a higher gear ratio. But many (like you) have said they wished that they had gone a step or two lower.
Click to expand...

So true it hurts to think about it!


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