I have a 2011 Jeep Wrangler with the 3.8 ltr 6 speed manual. I have posted my gear issue before and am so confused with what to do. This is my DD. I use my Jeep on the interstate for work and travel. I will be getting my 4.88's installed this week while I am offshore at work. My problem is that I don't wanna over do my build. I plan on minor rock crawling, meaning, I won't be putting my Jeep in a shuttle launch position on a rock. I have Yukon 4.88's ready to be installed with Yukon Zip lockers, & Nitro axel sleeves. I live in South Louisiana and don't really have many places to wheel around here. Plans are to trail ride and minor rock crawling in Hot Springs Ark. Some muddin will be in there somewhere also. My issue is this, I have a bunch of conflicting replies to previous post, and I read other threads of simular issues. I have the D30 front, and D44 rear. I am concerned with fuel mileage with the 4.88's. Some say they get 17 to 18 mpg, but they have autos, I have a 6 speed manual, so it will be different. I want my Jeep right, but undecided on what set-up to go with. The guys at Cajun Offroad said they would swap me my 4.88's to either 4.11's, or 4.56's. I know if I go 4.88's, 35" tires and at least a 2.5" lift will have to be done. I need help on the right decision guys. Like I said, no bigtime rock crawling cause I have to drive my Jeep back to Louisiana. What the hell do I do guys? The longer my gears sit at my house, the more I read threads and replies and I get to wondering if I am making the right choice.

 

The good thing about the 4.88's is that you will still be able to use 6th gear and have power. I personally would rather have the extra torque, but the 4.56's may give slightly better gas mileage.

 

What size tire you want to run?

 

It may have been in one of your old posts, but in this thread, it sounds like you are putting the cart before the horse. Why would you regear 'before' you even decide on what tire size and lift height you are going with?

Decide on a tire size. Get the tires/lift/flats/whatever. Drive it. And THEN decide on a ratio...

 

He said 35's...

 

You will be happy with 4.88s, with an '11 6 speed and 35s up to about 70 mph as a flatlander.

If you spend almost all your time at 70-75 mph, 4.56s may be preferable if you have a lighter rig and are a flatlander.

(If you lived in the Rocky Mountains, the better choice might be 5.13s over 4.88s.)

If you frequently drive long distances over 75 mph, your fuel economy will be poor regardless of 4.56s vs 4.88s. So, the performance gains of the 4.88s would likely outweigh the relatively small rpm difference.

4.10s would be a complete waste of money because the performance would be so poor that you would end up paying to regear twice.


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Best bet is to trade for a new 3.6L!

 

I ran 4.88's in my 07 2dr 6spd on 35's km2's with a super charger. My opinion was that it was too much gear for the jeep. Was great offroad but high on the rpm at hwy speed in 6th gear. I would say 4.56 and that still puts you at 26-2700 rpms at 70. I was rocking 2900rpms and getting less than 15 on the highway. Just remember when checking out the gear ratio charts that your 35's won't actually measure that, more like 34 or 33 and some change.

 

I agree with this i'd be doing the 4.56

 

Actually, the way it reads to me is that he is undecided, and planning to get a tire size to correspond to whichever gears the shop installs.


'If' he goes with 4.88's, he knows he will want 35's and a 2.5" lift. But what 'if' he gets 4.56? Or 4.10? Cart before the horse. He should decide on the future tire size, or get the tires and drive on them, before dropping money on the gears.