Are 4.10s sufficient?

[Somefun]

sounds great but they won’t work in my jeep as it has different axles

Yeah that's what I was thinking after I sent the post. lol

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[grimmjeeper]

Yeah that's what I was thinking after I sent the post. lol

Also one thing to remember is that almost every shop won't install used gears. The few that do won't warranty the work because they have now way to be sure the gears are in good shape. The gears may be fine but they won't take your word for it.

 

[Zandcwhite]

The stock gearing is terrible on non-rubicon models. You have the same effective drive ratio as a stock Rubicon with 4.10's and 37's. If you plan to run 35's anyway, you want the other Rubicon goodies, and never plan to go any larger, just order your new Rubicon with the XR package. 4.56 gears and 35's from the factory with better brakes, upgraded front axle, steel knuckles, and upgraded spare tire mount. Personally I prefer the higher side of gearing as I do drive 80+ on the freeway regularly so I think the 4.56's are borderline with the 35's on our 2022 JLUR with XR package. Not so low that it doesn't work but I definitely wouldn't order the 4.88's for 35's personally. For my use, I'll be happier with the 4.56's and 37's.

 

[kah.mun.rah]

Run the 35s with the stock 4.10 until the axle warranty runs out. By then you will know if you are ok with the 4.10 or want to jump to something numerically higher.

 

[Aquastream]

The stock gearing is terrible on non-rubicon models. You have the same effective driver ratio as a stock Rubicon with 4.10's and 37's. If you plan to run 35's anyway, you want the other Rubicon goodies, and never plan to go any larger, just order your new Rubicon with the XR package. 4.56 gears and 35's from the factory with better brakes, upgraded front axle, steel knuckles, and upgraded spare tire mount. Personally I prefer the side of gearing as I do drive 80+ on the freeway regularly so I think the 4.56's are borderline with the 35's on our 2022 JLUR with XR package. Not so low that it doesn't work but I definitely wouldn't order the 4.88's for 35's personally. For my use, I'll be happier with the 4.56's and 37's.

great thanks for all of that ?

are you suggesting that the 3.45 gears and factory 32s are about equal to running 37s on 4.10s?

 

[grimmjeeper]

great thanks for all of that ?

are you suggesting that the 3.45 gears and factory 32s are about equal to running 37s on 4.10s?

Yep. It's easy to calculate.

old gear ratio x new tire size / old tire size = new gear ratio.

3.45 x 37 / 32 = 4.093

If you use the true tire size the results will be a hair different but still pretty close.

You can also figure what tire goes with different gears.

old tire size x new gear / old gear = new tire.

32 x 4.10 / 3.54 = 37.06

 

[Aquastream]

Yep. It's easy to calculate.

old gear ratio x new tire size / old tire size = new gear ratio.

3.45 x 37 / 32 = 4.093

If you use the true tire size the results will be a hair different but still pretty close.

You can also figure what tire goes with different gears.

old tire size x new gear / old gear = new tire.

32 x 4.10 / 3.54 = 37.06

i’ve seen these equations before but i just wasn’t sure about them, thanks alot

according to this, 4.10s are fully sufficient because my 3.45s were even still good IMO with 285/70/17 KO2s

 

[Zandcwhite]

great thanks for all of that ?

are you suggesting that the 3.45 gears and factory 32s are about equal to running 37s on 4.10s?

Numerically identical. If a stock sport is at 2500 rpm at 85mph in 8th gear, a Rubicon on 37's with 4.10's will also be at 2500rpm at 85mph in 8th gear. Granted the 37's have a higher rolling mass so the stock sport will feel like it pulls a little harder but only barely.

 

[Headbarcode]

If you’re trading in for other reasons the 4.10’s are good. They’ll do fine, even if occasionally they annoy you. Doubly so with the 2.0. My Rubi offroaded fine with 39’s and 4.10’s. Granted, I only did some basic stuff. It wasn’t the apocalypse the forums sometimes suggest it would be.

40's and lifted 6" over stock, and still rocking the factory 4.10's on my daily driver/rock crawler. Performed amazingly in Windrock Park.

This short cut through was a lot steeper than this pic shows...

 

[CarbonSteel]

It all depends on what you want to do and how tolerant you are of loss of power. You could re-gear your existing setup a lot cheaper than buying a whole new Jeep, but I get it sometimes you want something new.

You will likely find that 4.10 and 35's are still inadequate depending on elevation, use case, etc.

Generally speaking, this is what I recommend and have done--I re-geared twice:

3.6L/ZF8:

33" = 4.56
35" = 4.88
37" = 5.13
38+ = 5.38

 

[Aquastream]

This thread so far has been every bit as informational as i’d like, thanks everyone

My goals right now are to first off test ride a 2.0 and hopefully it has 35s!

 

[Jtclayton612]

40's and lifted 6" over stock, and still rocking the factory 4.10's on my daily driver/rock crawler. Performed amazingly in Windrock Park.

This short cut through was a lot steeper than this pic shows...

Was this a shortcut up the gravel trail to the windmills? I wanted to try it when I was there over Veterans Day weekend but man it had just rained and it was so slick.

 

[Headbarcode]

Was this a shortcut up the gravel trail to the windmills? I wanted to try it when I was there over Veterans Day weekend but man it had just rained and it was so slick.

I forget the trail designation (P1 or G1 or something like that), but there's a hairpin right-hand curve on the main trail heading up from the general store. That was a cut through option instead of continuing around the hairpin.

It had 2 tracks. An easier dirt ramp of sorts, and the other made up of huge boulders followed by a 3ish foot vertical rock wall. Coming back down was a real eye opener. I was less than an hour into my 1st real offroading and was thinking at the time that I had no business doing that with next to zero experience. My jeep is far more capable than myself at this point.

 

[Jtclayton612]

I forget the trail designation (P1 or G1 or something like that), but there's a hairpin right-hand curve on the main trail heading up from the general store. That was a cut through option instead of continuing around the hairpin.

It had 2 tracks. An easier dirt ramp of sorts, and the other made up of huge boulders followed by a 3ish foot vertical rock wall. Coming back down was a real eye opener. I was less than an hour into my 1st real offroading and was thinking at the time that I had no business doing that with next to zero experience. My jeep is far more capable than myself at this point.

That’s a lot more filled in on the dirt ramp then when I was there! People were laying on the skinny pedal trying to get grip through the mud, the “wall” on the dirt ramp was up halfway on my window lol.

And yeah I watched 3-4 people attempt it and not a single one made it with how wet it was out, we got the tail end of Nicole the day before and the first day we were out.

That vertical wall was no joke, I passed after watching someone bouncing on d60s on it not make it up

 

[sciotola88]

4.10s and 35s should be OK.. be careful listening to others. 4.10s are not OK on 37s and 40s. Anyone who says so has never driven a properly geared Jeep.

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