Should I regear?

[jensjer]

It's hard to find data on tooth contact area. At one time the guys at True Hi9 had data on the 9" and D60 on their website, but it's no longer there. They found the D60 5.13 ratio was stronger and had more contact area than the D60 4.88 ratio. Obviously it's not a D44, but if this is true for a D60 for these particular ratios, it could also be true for certain deep vs high D44 ratios.

Usually there is noise when a pinion bearing is going. If you ignore maintaining bearings, I wouldn't call replacing the gear set maintenance. That is a result of a lack of maintenance.

Big picture once you need gears you already have a lift, wheels, racks that go clank added weight that all start to make more noise and stress than a stock ride and early noises from a piñon are masked and by the time it’s noticed damage is done that’s why 7 years is a good run on set of gears. Also the majority of folk are trusting gear installs to a local shop that doesn’t see more than 10 per year across every read end manufacture so your adding in another factor of error..

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[Wheelin98TJ]

Big picture once you need gears you already have a lift, wheels, racks that go clank added weight that all start to make more noise and stress than a stock ride and early noises from a piñon are masked and by the time it’s noticed damage is done that’s why 7 years is a good run on set of gears. Also the majority of folk are trusting gear installs to a local shop that doesn’t see more than 10 per year across every read end manufacture so your adding in another factor of error..

Ignoring noises from other stuff so the pinion noise can be ignored. I’m not seeing the big picture.

 

[jensjer]

Ignoring noises from other stuff so the pinion noise can be ignored. I’m not seeing the big picture.

That makes zero sense..
But Seriously do what ever the F you want.. I just provided experiences, maybe mine in the past were installed wrong.. I'll check back in 7 years how these rigs are still holding up post gearing.

 

[Wheelin98TJ]

That makes zero sense..
But Seriously do what ever the F you want.. I just provided experiences, maybe mine in the past were installed wrong.. I'll check back in 7 years how these rigs are still holding up post gearing.

Thanks for approval doing the F what I want.

You said clanky racks and lifts mask pinion bearing noise. I tend to not let stuff rattle and make noise, and if it does, I figure out what’s causing it and eliminate it. So other important noises aren’t masked and ignored. That’s all I was saying.

 

[Klicht87]

I've heard good things about Nitro Gears but I didn't see 5.13s. only 5.29s and 5.38s. This will be the first vehicle I'll be regearing....most likely next summer.

 

[JulesAo]

Bumping this thread.

I have a '21 Mojave and am looking to put new tires/wheels on her. I want 37s, and was thinking of settling for 35s because of the extra expense involved, but am told regearing isn't strictly necessary, at least night right away.

That said, if I DO regear, I was between 4.88 and 5.13 and was wondering what advantages/disadvantages come with either.

For context, I live in Florida, so bad weather and hills aren't typically an issue. I do some off-roading, but I don't expect I'll be in Moab anytime soon either. I work from home so don't have much of a commute to contend with, but do find myself on the highways pretty regularly.

 

[intentsrig]

Bumping this thread.

I have a '21 Mojave and am looking to put new tires/wheels on her. I want 37s, and was thinking of settling for 35s because of the extra expense involved, but am told regearing isn't strictly necessary, at least night right away.

That said, if I DO regear, I was between 4.88 and 5.13 and was wondering what advantages/disadvantages come with either.

For context, I live in Florida, so bad weather and hills aren't typically an issue. I do some off-roading, but I don't expect I'll be in Moab anytime soon either. I work from home so don't have much of a commute to contend with, but do find myself on the highways pretty regularly.

I just re geared to 5.13's from 3.73's. On 37's. The difference is absolutely massive. It feels now like the Jeep effortlessly accelerates. Holds 8th on the highway and at 65mph I am around 2200 rpm I believe. I will have to look again on the way home. I was on the stock gears with 37's for about a month and a half.

I had a JL that was on 37's and 5.13's as well but it feels much more drastic this time. The JL was a manual transmission though. So it always sort of felt like I never had deep enough gearing.

For 37's I think 5.13's are great. For 35's I would stay 4.88. I just like deeper gearing. I would have gone 5.38 with my manual JL if I had known.

 

[JulesAo]

I just re geared to 5.13's from 3.73's. On 37's. The difference is absolutely massive. It feels now like the Jeep effortlessly accelerates. Holds 8th on the highway and at 65mph I am around 2200 rpm I believe. I will have to look again on the way home. I was on the stock gears with 37's for about a month and a half.

I had a JL that was on 37's and 5.13's as well but it feels much more drastic this time. The JL was a manual transmission though. So it always sort of felt like I never had deep enough gearing.

For 37's I think 5.13's are great. For 35's I would stay 4.88. I just like deeper gearing. I would have gone 5.38 with my manual JL if I had known.

I did go with 37s--and may put a 2" spacer kit on--after all. Love them, don't regret it. Glad I chose them over the 35s.

Thanks for the input. I've heard 5.13 delivers more power, but the 4.88 is better on gas I guess. I'm not super hardcore offroad (yet, anyway) and am looking for some balance. Wish I could try it out before making a decision.

 

[nickd]

I am considering re-gearing this year also and keep going back and forth between 4.88s vs 5.13.

I am on 37" BFG KO2s, essentially the smallest 37" tire available. I love the tires and would likely stick with these in the future. My jeep is a weekend warrior. I go off-roading once a month, but also do extensive highway driving to these destinations.

My biggest concern is making the jeep less enjoyable on the street where it spends most of its life.
I am weary of message board posts and confirmation basis. Its rare people will say their setup is not the best one available.

I am leaning towards the 4.88 because I think it will improve the acceleration while not negatively effecting highway performance. However, I am torn because I understand the sentiment that 4.10s to 4.88 might not be worth the $2500 investment. So maybe I just do nothing and leave it as is???

 

[JulesAo]

I am considering re-gearing this year also and keep going back and forth between 4.88s vs 5.13.

I am on 37" BFG KO2s, essentially the smallest 37" tire available. I love the tires and would likely stick with these in the future. My jeep is a weekend warrior. I go off-roading once a month, but also do extensive highway driving to these destinations.

My biggest concern is making the jeep less enjoyable on the street where it spends most of its life.
I am weary of message board posts and confirmation basis. Its rare people will say their setup is not the best one available.

I am leaning towards the 4.88 because I think it will improve the acceleration while not negatively effecting highway performance. However, I am torn because I understand the sentiment that 4.10s to 4.88 might not be worth the $2500 investment. So maybe I just do nothing and leave it as is???

I'm in the same spot.

 

[1550jrit]

I've got a Mojave with 3" Franken Lift, 37's, and 5.38's. I also run a Tazer and Banks Pedal Monster. On my way to work this morning, I could not stop grinning over the absolute joy it is to hit the accelerator and have the truck just flat out move. It's certainly not a sports car, but having deep gearing makes it a drive like you are running factory-size tires with a few performance mods added. I couldn't even tell you that I was running 37's with how well it accelerates. 5.38's are only about 4.5% deeper than 5.13's, and I'm super pleased to have that extra depth. Do I get better mileage with gears? Maybe at first, during the break-in period, when I was driving super easy on the throttle. Now? Absolutely not, simply because I have too much fun accelerating around town. I'm all for re-gearing because of the practicality, but the pure enjoyment makes it worth the money.

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