diggerbuzz

Would u go with 410s or 456s with the 5 speed auto tranny and 35s ? Ive read a few post and mostly everyone is running 6 speed manuals.

Invest2m4

Assume you have 3.73? Hard to drop a lot of coin on 4.10 when it's a $200 option from the factory....

4.10 really isn't enough of a change. Maybe it works if you don't add any weight to your Jeep and usually don't have passenger or gear, and drive in a mostly flat area. If that's not you, then 4.56. Don't fear the gear. The 3.6 engine likes to run higher revs. You'll likely get better mpg running higher rpm and the trans not shifting on the highway. Basically, there's no downside to 4.56. Moderate potential for downside to 4.10.

DadsCJ

I went with the 4.56's when I ran 35's and didn't like the rpm on the interstate and 75-80.

But, what a gear off road and around town.

Huge pickup and acceleration, fun ride.

Now have 37's with 4.56 and still fun.

If I did it again with 35's I would do 4.10's if you are NEVER going to 37's.

I said that also......, LOL

Mbogan

I recently haven't from 3.21 to. 4.56 w/ 34-35" Duratracs. I was considering 4.10,but VERY glad I went with 4.56. Don't even think about it anymore, go to 4.56.

Hoopskier

I went 4.11 I am happy with it. 2500 rpm @ 70. 315/70r17 tires. Harder to justify cost when it was a factory option for Rubicon. I also DIY the gears so helps the cost as well.

I don't see why everyone says 4.10 are significantly more, because Alloy USA has 4.10 priced competitively with other gear sets.

Invest2m4

Hmmm.... Running 2500 rpm at 70 on a 3.6L with 4.10s means you have the equivalent of a 32" tire.

Invest2m4

Define "didn't like"? That's incredibly subjective. The engine probably loved it. It doesn't buzz or sound louder at higher rpm. What's not to like?

AnvilX14

I have a 2014 JKURX with auto and 4.10s. I have a 3" lift with 35" Federal Couragia tires (measured with a tape at 33.5"). I do run around 2600 rpm at 70 mph. On hills on the interstate I am downshifting and run around 3000 rpm until it flattens out. In the sand dunes it's a bit doggy if I don't have enough momentum, not sure if 4.56 would help that. If I bought my Jeep as a flat land pavement pounder I would have ordered it with 3.73 because I think that would give the best mpg. I knew I would be off-roading and didn't want to operate on it by putting aftermarket gears in it, so I ordered it with 4.10. All in all, I'm satisfied until it gets paid off and I go to 37s, then I'll probably do 4.56 or 4.88.

Hoopskier

I guess I should have been more clear or specific, 2450 @ 70.

My tires measure out to 33" with the weight of the jeep, manufacture spec, 34.4. When I used my Flashcal, it gave the the OEM spec of 30.75" for the OEM 32" tires.

With the 4.11 gears/34" tires, drives like the 3.73 gears/32" tires. Effective gear ratio calculators support this.

It works fine for me in my area. It is mostly a daily driver, and I don't plan on going with larger tires. Deciding to change gear ratio was hard enough, picking out which one was even harder. So many opinions, and combinations.

DadsCJ

You are correct, it is subjective. That is why it is my opinion.

If I don't like driving at 2900 rpm at speeds, why would you give me grief about my opinion?