4.56 are amazing, great for hwy with 35s.

 

Ive got a 2011 JKU auto, and once I put on the 35's I will be looking at re-gearing. I too have looked at the charts and talked to "experts" about either going with 4.88 or 5.13's. I also tend to think that there is a widespread predisposition to overgearing as well. My gut tells me I should be going with 4.88's, but I get a lot of "Nahhh, you really want to go 5.13's with that." Great thread.

 

Gearing Up for Taller Tires! · Superlift · www.superlift.com maybe this chart will help maybe it wont I found it the other day

 

It seems as if gearing is a matter of preference and opinion. Some may like the "added performance" of regearing to 4.88 or lower, while others might hate it. I think I am going to go 4.88, as my long term goal is to run 37's.

 

So the charts that I've seen show that 4.56 and 4.88 are good DD gears for a manual but that 4.88 and 5.13 is a good DD for auto. Is what i'm reading here saying that all regearing seems to tend toward "overgearing" or just for manuals? Is 5.13 really not right for 34 - 35 inch tires on a auto JKU?

 

Is there a big difference between 4:56 and 4:88? I have an 11' 6spd and was thinking about which gears to get. 4:88's seem a bit cheaper but i dont wanna be revin too high all the time. I'm glad to have saw this thread.

 

I'm happy with my 4.88's. You really think 6% difference in gear ratio will make a difference? 2000 RPM with 4.56 would be 2120 RPM for 4.88.

 

I made poor descisions for gear ratios before... When talking correct gear ratios there are a lot of factors like: manual 3.8, auto 3.8, pentastar auto, etc. One gear ratio results in different RPM's on each combination. (There are many other threads with the charts.)


Wgrin- you could always get 37's to go with your 4.88's.

 

Already thinking that but just literally got 35s

 

Honestly with an Auto your 5.13 is like my 4.88 and it comes down to what you plan on doing with your rig. If you are a daily driver then I'd do the 4.88s for you. Honestly to best sum it up my 4.88s on manual are now like the engine is doing more work for the same result. Someone earlier posted that its a 6% percent difference. Well when we are tuning our jeeps to get 10 horsepower here, 10 extra torque there, every 1% equals something I'd like to hold on to. I guess it's hard to say when I haven't driven a manual 4.56 only 3.21 and 4.88. I honestly feel like I lost some low end power I know it's supposed to help accelerate faster but it just doesn't seem like it is all that much, as if the engine is in high RPM for real reason. I had to pull out this evening and my tach went to 5k RPM just so I could get up to 40 mph in 3rd gear. People like to plan for the future and the what if's, what if i get bigger tires, what if i start going hardcore off road. I like to do that what am i doing right now. 4.88s are ok, I think 4.56s for me would have been wiser.