Should I Regear?

[kah.mun.rah]

Sounds like a poor setup.

Yes it was. I should have stuck with 4.88.

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[kah.mun.rah]

Sorry OP. @CarbonSteel and @word302 I would be happy to answer any other questions in a chat rather than taking up space here.

 

[word302]

If knowing what you are talking about is a prerequisite to the Forum, @word302 would have been banned years ago.

So you come in and tell the guy who literally has first-hand experience with every gear/tire combo he’s recommending that he’s wrong but have no personal experience to back up that claim other than “I once had 5.13s and 37s on some vehicle and it sucked”. You’re priceless man.

 

[kah.mun.rah]

So you come in and tell the guy who literally has first-hand experience with every gear/tire combo he’s recommending that he’s wrong but have no personal experience to back up that claim other than “I once had 5.13s and 37s on some vehicle and it sucked”. You’re priceless man.

If you take a minute and rewind the conversation I didn't say that he was "wrong". I said that "IMO" for the average JL (since there are so many factors to consider) "I feel" the tire size to ratio matches he listed are numerically a little high.

 

[word302]

Perfect example of @word302 not knowing what he is talking about. If you take a minute and rewind the conversation I didn't say that he was "wrong". I said that "IMO" for the average JL (since there are so many factors to consider) I feel the tire size to ratio matches he listed are numerically a little high.

Based on what experience? I know facts are hard.

 

[kah.mun.rah]

What data do you have to support that statement and based upon what criteria? I have lived through all of the combinations that I stated above and none of them are/were over-geared as you are suggesting.

What you are trying to say is either based upon JK data or you are simply guessing.

Ironically I do have 5.13s in a JK but I am not talking about that because the 5.13s actually work very well with the JK engine and transmission combo. I made the mistake thinking 5.13 would be a good fit in my 2018 JL. The RPMs were too high. I don't live in the mountains and don't carry 1,000 lbs of mods, gear, and passengers so that is probably why we have two different experiences. I know A LOT of people with the 4.88 and 37s with their JL and that seems to be the sweet spot for an average build in an average altitude with an automatic transmission. In my 2021 I am running the stock 4.10 with 37s until I upgrade the axles. Not perfect but it works just fine until the new axles arrive. No disrespect to your chart I just wanted to throw out there that there are many parts to the equation to consider.

 

[conFUcius]

Ironically I do have 5.13s in a JK but I am not talking about that because the 5.13s actually work very well with the JK engine and transmission combo. I made the mistake thinking 5.13 would be a good fit in my 2018 JL. The RPMs were too high. I don't live in the mountains and don't carry 1,000 lbs of mods, gear, and passengers so that is probably why we have two different experiences. I know A LOT of people with the 4.88 and 37s with their JL and that seems to be the sweet spot for an average build in an average altitude with an automatic transmission. In my 2021 I am running the stock 4.10 with 37s until I upgrade the axles. Not perfect but it works just fine until the new axles arrive. No disrespect to your chart I just wanted to throw out there that there are many parts to the equation to consider.

I think a reasonable discussion is 4.88s vs. 5.13s for 37s. To say that a re-gear is unnecessary is wrong. Someone on the forum once tried to tell me that 4.10s on the Rubicon for stock 33s was over-geared and so adding larger tires (like 37s) brought it back to what Jeep was actually targeting .

It’s fine if one wants to wait for a new axle or de-prioritize the re-gear but to say it’s completely unwarranted is just giving bad information… especially if one has never driven a re-geared one.

 

[kah.mun.rah]

I think a reasonable discussion is 4.88s vs. 5.13s for 37s. To say that a re-gear is unnecessary is wrong. Someone on the forum once tried to tell me that 4.10s on the Rubicon for stock 33s was over-geared and so adding larger tires (like 37s) brought it back to what Jeep was actually targeting .

It’s fine if one wants to wait for a new axle or de-prioritize the re-gear but to say it’s completely unwarranted is just giving bad information… especially if one has never driven a re-geared one.

I agree that 4.10 isn't perfect with 37s. I have multiple places above where I suggest 4.88 with 37s. I have run 5.13 with 37s on a JL and it was too much. But as I have stated above, it all depends on wheel/tire weight, tire PSI, tire tread type, tire width, Jeep weight, engine torque, transmission type, altitude, terrain, axle type, etc. etc. when deciding between 4.88 and 5.13. 5.13 with 37s is probably perfect for people with heavy Jeeps at high altitudes. 4.56 with 37s is probably perfect for someone with a stock Jeep at sea level. My opinion is that with the average values of those parts of the equation, the 4.88 will be the best option for most people with 37s.

 

[blnewt]

Wow, leave this thread for a day and it goes wild

 

[conFUcius]

I agree that 4.10 isn't perfect with 37s. I have multiple places above where I suggest 4.88 with 37s. I have run 5.13 with 37s on a JL and it was too much. But as I have stated above, it all depends on wheel/tire weight, tire PSI, tire tread type, tire width, Jeep weight, engine torque, transmission type, altitude, terrain, axle type, etc. etc. when deciding between 4.88 and 5.13. 5.13 with 37s is probably perfect for people with heavy Jeeps at high altitudes. 4.56 with 37s is probably perfect for someone with a stock Jeep at sea level. My opinion is that with the average values of those parts of the equation, the 4.88 will be the best option for most people with 37s.

I’m not saying you advocated against re-gearing, haha, I was just chiming in (yay, forums). Can’t remember who it was but someone on here was taking the position that a re-gear is completely unnecessary. Whoever it was, I’m definitely with @word302 and @CarbonSteel that they’ve never driven a properly geared (4.88 or 5.13) Jeep and should probably try it before they say 4.10s are fine.

 

[word302]

I agree that 4.10 isn't perfect with 37s. I have multiple places above where I suggest 4.88 with 37s. I have run 5.13 with 37s on a JL and it was too much. But as I have stated above, it all depends on wheel/tire weight, tire PSI, tire tread type, tire width, Jeep weight, engine torque, transmission type, altitude, terrain, axle type, etc. etc. when deciding between 4.88 and 5.13. 5.13 with 37s is probably perfect for people with heavy Jeeps at high altitudes. 4.56 with 37s is probably perfect for someone with a stock Jeep at sea level. My opinion is that with the average values of those parts of the equation, the 4.88 will be the best option for most people with 37s.

Ok I’d love to hear your explanation of how axle type factors into the equation.

 

[blnewt]

The only people who advocate for not re-gearing are people who have never driven a properly-geared rig.

Or are running smaller M186/200 axles
Put that money in a "save for Rubi axles" jar and call it a day
Then when that jar is full, get another jar labelled "save for better gears for my Rubi axles"

 

[conFUcius]

Wow, leave this thread for a day and it goes wild

We can resurrect two other threads… have all different tangents in each one?

 

[kah.mun.rah]

Ok I’d love to hear your explanation of how axle type factors into the equation.

I am happy to explain. If you put 5.13 in a Sport front axle your ring gear teeth will be very small (and weak) compared to 5.13 teeth in a Rubicon front axle.

 

[word302]

Or are running smaller M186/200 axles
Put that money in a "save for Rubi axles" jar and call it a day
Then when that jar is full, get another jar labelled "save for better gears for my Rubi axles"

And then you can be like me “I’m not spending any more on these Rubi axles because I’m getting tons”?

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