Re-gearing axles: What ratio should I go with

[RiJeeper]

Hi everyone, I’ve had 35” tires with stock 3.73 gears for like 2 years now and I’m putting in a front locker and a rear 8.8, and I figure that now would be the time to re gear, 3.73s currently suck on 35s i hardly ever even get into 5th gear. What gear ratio should I run on 35” mud tires, 4.0 engine, and 5 speed transmission? Thanks.

 

[TJ_2000]

4.88

 

[Steel City 06]

4.88, or maybe 5.13 if you don’t do 70+ mph much

 

[Jerry Bransford]

X3 on 4.88 for 35's, 4.0, and 5-speed. I ran that combination for years and loved it on both the highway and offroad.

 

[TJ_2000]

Now go find you a cheap HP30 to put 4.88’s into.

 

[jjvw]

No less than 4.88. I would argue for 5.13.

 

[Chris]

https://wranglertjforum.com/threads...angler-tj-lj-and-other-re-gearing-faqs.17063/

 

[Jerry Bransford]

No less than 4.88. I would argue for 5.13.

I would argue for 5.13 too if I lived in a high altitude state like Colorado as you do. But for a low altitude state like the OP's Rhode Island I'd stick with 4.88.

 

[jjvw]

I would argue for 5.13 too if I lived in a high altitude state like Colorado as you do. But for a low altitude state like the OP's Rhode Island I'd stick with 4.88.

Most in Colorado follow the Rhode Island advice, if they regear at all.

NV3550/34”/4.88=2640rpm @ 75mph
NV3550/34”/5.13=2966rpm @ 75mph

 

[AndyG]

From 3:73 , you will love the regear . You have our approval , with 30 days to get the work done , 60 if you do your own.

 

[RiJeeper]

I would argue for 5.13 too if I lived in a high altitude state like Colorado as you do. But for a low altitude state like the OP's Rhode Island I'd stick with 4.88.

What does altitude have anything to do with that?

 

[RiJeeper]

From 3:73 , you will love the regear . You have our approval , with 30 days to get the work done , 60 if you do your own.

What do you mean 30 days?

 

[jjvw]

What does altitude have anything to do with that?

3% loss of HP per 1000ft of elevation. Mine is about 16% less powerful in Denver than if it lived in Rhode Island.

Whether or not that plays a role in gear selection is something I'm not entirely sure of since the power band is still the same, just less.

 

[jjvw]

What do you mean 30 days?

There is a committee. The clock is ticking.

 

[AndyG]

What do you mean 30 days?

We have a lot of rules , I make them constantly.

 

[RiJeeper]

We have a lot of rules , I make them constantly.

I’m so confused

 

[TJ_2000]

I live at 5,000 feet (NM) and have driven my Jeep to 13,000 feet (CO). I noticed zero difference in power.

 

[jjvw]

I’m so confused

It's a bit of a running joke. Choosing the most appropriate axle ratio is unnecessarily complicated, as are most committees. And the same group is unusually involved in the recommendations.

 

[AndyG]

I’m so confused

Just messing with you buddy.

 

[DrDmoney]

No less than 4.88. I would argue for 5.13.

X2 on the 5.13’s