Mojave should come with 4.56 gears 4.10s dont cut it

[Zachanadandy]

Also not true. Closer to 7 1/2.

For the rest of your post, you do you and I'll do me. Your use case is not the same as mine. Your preferences are not the same as mine.



Sure... these are the most perfect vehicles ever designed and built by mankind. We are at the pinnacle of perfection and only a fool would mess with it. Or maybe the manufacturer was trying to squeeze out a few more tenths of a mpg at the behest of government rules and regulations and the tradeoff was a decrease in driveability, while I have the opposite idea.

Actually, I am confounded why this is such a controversial topic. There are a wide range of mods made by so many people and for some reason gearing and the oil threads bring out such opposite and hard-set opinions, as if it was politics or religion.

Because the I need more gearing crowd has about the same tangible benefit as religion. There are literally those who documented 0-60 runs via draggy before and after a gear change and across the entire graph gained nothing. So that disproves the gaining power and acceleration back via gearing argument. There are those like me who documented before and after mpg. Gained 1 mpg in a lot of stop and go driving... and lost 2-3 on long highway drives. $3k so it shifts less and in your head it somehow improves driveability even though it can't be measured? The religion argument is spot on. Enjoy your imaginary friend and imaginary gains via gearing.

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[professorkx]

Actually, I am confounded why this is such a controversial topic.

The only reason I respond on these gearing threads is because there are a lot of folks who look at these forums to help them decide on a direction for modification. IMHO, threads like these can result in folks with limited experience spending money unnecessarily.

as I’ve noted elsewhere, for me, a gear change cost is only parts, as I’ve done many and have a well equipped shop for such things, and I’m not planning a gear change on my Gladiator. Heck, I just finished a gear change on my 34 foot motorhome on a F550 chassis, so a Jeep is on the simple side of things when it comes to gears.

in the end, folks get to decide for themselves, but the less mechanical need to get the whole story that a gear change is not the Holy Grail for any Jeep…IMHO.

 

[Badunit]

The only reason I respond on these gearing threads is because there are a lot of folks who look at these forums to help them decide on a direction for modification. IMHO, threads like these can result in folks with limited experience spending money unnecessarily.

I totally agree with that, 100%. It is when someone posts "you're stupid for even thinking about it" or snarky shit like "enjoy your imaginary gains" that I don't get.

 

[Zachanadandy]

I totally agree with that, 100%. It is when someone posts "you're stupid for even thinking about it" or snarky shit like "enjoy your imaginary gains" that I don't get.

You call it snarky, but can't define what benefit you actually got from regearing? "Driveability"? How? It shifts less, but it's an automatic so how's that more drivable? Quicker? No. Better mpg across all uses? No, especially not when driven the same. Better how? It's a simple question that never gets answered. "Well if you tow..." pulled an 8200 pound trailer on 37s and 4.10s over 500 miles with over 5k feet of elevation gain. Maintained speed even up the steepest grades where it's common for the semis to be rolling 40mph in the right lane. 65mph no problem. 0 to be gained by more gearing there. "Well if you drive in the mountains" every Jeep I've ever owned sees 0 foot elevation and 10k' plus on a regular basis. Yes they are down on power at elevation, no more gearing won't change that or a downshift would change it just the same. Gearing for more power is a hold over from wide ratio 3 and 4 speeds. We have all the gearing you could ever need in this 8 speed. Better how that's it?

 

[Badunit]

Would regearing be necessary/desired if your Jeep had 3.42 with your 37" tires? Would there be any benefit? If so, what would that benefit be?

 

[Wheelin98TJ]

You call it snarky, but can't define what benefit you actually got from regearing? "Driveability"? How? It shifts less, but it's an automatic so how's that more drivable? Quicker? No. Better mpg across all uses? No, especially not when driven the same. Better how? It's a simple question that never gets answered. "Well if you tow..." pulled an 8200 pound trailer on 37s and 4.10s over 500 miles with over 5k feet of elevation gain. Maintained speed even up the steepest grades where it's common for the semis to be rolling 40mph in the right lane. 65mph no problem. 0 to be gained by more gearing there. "Well if you drive in the mountains" every Jeep I've ever owned sees 0 foot elevation and 10k' plus on a regular basis. Yes they are down on power at elevation, no more gearing won't change that or a downshift would change it just the same. Gearing for more power is a hold over from wide ratio 3 and 4 speeds. We have all the gearing you could ever need in this 8 speed. Better how that's it?

There are plenty of posts from people that have regeared. Most of them are happy with the change. Throw out those that are justifying the money spent and there are still some left that are happy.

 

[Zachanadandy]

There are plenty of posts from people that have regeared. Most of them are happy with the change. Throw out those that are justifying the money spent and there are still some left that are happy.

Obviously those who were on the extreme end will be happy. 3.73s and went to 40s? Worth the money. 3.45s and 37s, I'd gladly spend it there. 4.10s to 4.56s is a waste with this transmission from experience running those different combos. Too small a change to make a big difference and the cost just isn't worth it. Going too deep for ME as someone who does drive a whole bunch of miles at 80+mph was worse than too tall. Small gearing changes don't do much because you already have so many gearing options in the 8 speed. For my use even 5.13s would be too deep on the freeway on 37s, as 4.56s was with 35s. The best combo we've run in my opinion for our use was 4.56 and 37s... and yet I no longer run that combo on either Jeep. Went to 39s on her JLUR and won't waste $3k for the small change to 4.88s or even 5.13s from the 4.56s. On my Mojave is primary build purpose is freeway+ speeds in the dirt. On 37s I'd prefer 4.56s, but again to small a change and too little gain to go from 4.10s. I'd love for it to have more power, and for the cost of regearing both I could supercharge it and actually gain power. I'm sure it will hold 8th more with boost too. Real, measurable gains not myth and conjecture.

 

[CreepyJeepy]

4.56, ecodiesel, 37”, is what I’m running

perfection!!!!

 

[ShadowsPapa]

You call it snarky, but can't define what benefit you actually got from regearing? "Driveability"? How? It shifts less, but it's an automatic so how's that more drivable? Quicker? No. Better mpg across all uses? No, especially not when driven the same. Better how? It's a simple question that never gets answered. "Well if you tow..." pulled an 8200 pound trailer on 37s and 4.10s over 500 miles with over 5k feet of elevation gain. Maintained speed even up the steepest grades where it's common for the semis to be rolling 40mph in the right lane. 65mph no problem. 0 to be gained by more gearing there. "Well if you drive in the mountains" every Jeep I've ever owned sees 0 foot elevation and 10k' plus on a regular basis. Yes they are down on power at elevation, no more gearing won't change that or a downshift would change it just the same. Gearing for more power is a hold over from wide ratio 3 and 4 speeds. We have all the gearing you could ever need in this 8 speed. Better how that's it?

I suspect most of it is "quick take-off" impressions.
The automatics have a torque converter - depending on the stall of the converter, it might feel better when taking off or driving in town, but that would be the end of it.
The automatic has enough ratios that it would simply be in a lower gear.
Otherwise, once moving, a gear or two lower in the automatic would give the same or similar FINAL ratio.
All you do by changing ratios as far as highway driving and so on is shift the points at which is shifts into each gear. And when you start talking about heat rejection science for the engine, no favors are being done.
Could get into engine wear and such, but no one really cares about the science and facts behind it all, the engineering side.

 

[Zachanadandy]

I suspect most of it is "quick take-off" impressions.
The automatics have a torque converter - depending on the stall of the converter, it might feel better when taking off or driving in town, but that would be the end of it.
The automatic has enough ratios that it would simply be in a lower gear.
Otherwise, once moving, a gear or two lower in the automatic would give the same or similar FINAL ratio.
All you do by changing ratios as far as highway driving and so on is shift the points at which is shifts into each gear. And when you start talking about heat rejection science for the engine, no favors are being done.
Could get into engine wear and such, but no one really cares about the science and facts behind it all, the engineering side.

Even there it is more placebo and/or you can feel the 1st couple shifts are quicker. In my own personal experience with testing using the trail dash 0-60 feature in our JLUR it wasn't quicker 0-30 or 0-60 after the regear. Measured quick take off was a wash. "Feeling quicker" is meaningless and certainly not worth the spend.

 

[Badunit]

The automatic has enough ratios that it would simply be in a lower gear.

...and then high gear, then a lower gear, then two gears lower then back to high gear, then a lower gear, then high gear.....
versus
high gear, high gear, high gear, lower gear, high gear, high gear, high gear...

I'd prefer it had more power/torque vs messing with the gearing but there's not much available other than a supercharger, which will significantly shorten the life of the engine and isn't available anyway for '23+ (as far as I know). If something does come out, I'll increase the power and increase my tires to 35's.

 

[Wheelin98TJ]

I suspect most of it is "quick take-off" impressions.
The automatics have a torque converter - depending on the stall of the converter, it might feel better when taking off or driving in town, but that would be the end of it.
The automatic has enough ratios that it would simply be in a lower gear.
Otherwise, once moving, a gear or two lower in the automatic would give the same or similar FINAL ratio.
All you do by changing ratios as far as highway driving and so on is shift the points at which is shifts into each gear. And when you start talking about heat rejection science for the engine, no favors are being done.
Could get into engine wear and such, but no one really cares about the science and facts behind it all, the engineering side.

Regearing, when needed, is to change the final drive ratio back to similar to what it was before a tire size change. There is engineering behind the gear ratios and final drive ratios. You know what I’m talking about because you’ve said it in threads about Max Tow models with 4.10 and the small tires.

 

[ShadowsPapa]

Regearing, when needed, is to change the final drive ratio back to similar to what it was before a tire size change. There is engineering behind the gear ratios and final drive ratios. You know what I’m talking about because you’ve said it in threads about Max Tow models with 4.10 and the small tires.

Exactly.
It "lines things back up".

 

[Hootbro]

Nice little sword fight we have going on here.

Count me in the I like to be in 8th gear cultist. Having owned two Rubicons with 4.10's and two Sports with 3.73 gears and running 33's on all of them, I can say I like 4.10's for that size all day long.

In my Sports with 3.73 gears and 33's, some days it can really hunt and peck between 8th and 7th gear on my daily commute that is about 75% flat with maybe a couple 3%-4% grades here or there going over overpasses and bridges. Most days it will maintain 8th gear but get even a slight 10MPH or more head wind on the JT and it is a constant every few seconds back and forth between 8th and 7th gear and that gets annoying mainly due to the drone of 7th gear at highway speeds.

Funny thing I noticed with my 4.10 Rubicons is that when I went from 33's to 35's and did not feel I needed a regear and it handled it a lot better than my 3.73 Sports going from 31's to 33's which I feel I need a regear to 4.10's and am currently working on.

 

[Splenda]

My Mojave with 4.10 gears and 37s stays in 6th gear or below most of the time. I recently took a trip to the mountains, and interstate driving saw some time in 7th gear. I honestly never saw the Jeep go into 8th gear in the 8-hour round trip. I'm going to hold off re-gearing until my 37s wear out, then I am going with 40s and a re-gear.

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