The axle guys will ring in soon, but if you do the math, there's not alot of difference there

 

When I was calling around getting quotes for mine, every place I talked to said to skip the 4.88's and go with the 5.13's...

 

With an auto it seems most people go lower, so either 5.13 or 5.38, but since you have the 3.6 motor I don't know.

I'm actually debating the same thing, but since I have a 6 speed and the 3.6, 4.88's would be more tolerable for me than you. I have a 20 mile round trip highway commute mon-fri so lower highway rpm's are better for me so I'm leaning towards 4.88's

 

Ya. I just feel like the 5's are risky for me. I would prefer lower rpm's I know the improvement to either will be huge from my 3.73's

 

go 4:88s if you are never going larger than possibly 38s

 

Danny's right, 4.88 is a good compromise. If you go above 37 on tires your daily driver is going to be pretty questionable just on basis of that. The difference in gearing is less than five per cent. The reliability factor easily offsets that.

 

Danny's right, 4.88 is a good compromise. If you go above 37 on tires your daily driver is going to be pretty questionable just on basis of that. The difference in gearing is less than five per cent. The reliability factor easily offsets that.

Thanks Ed. That's what I figured but wanted to make sure.

 

go 4:88s if you are never going larger than possibly 38s

Thanks Dan. I think its the safest bet and best all around. Have you regeared?

 

Nope, need to.. Just lazy and procrastinating

 

Nope, need to.. Just lazy and procrastinating

Haha. Ya... just kinda wanted to get someone's review on how much of an improvement 4.88 with the new engine is

 

Well mine is drivable with heavy 37s and a stickshift on 4:10s. So 4:88s and an auto should do good. Besides, your main concern is street so it is a better choice for you

 

Well mine is drivable with heavy 37s and a stickshift on 4:10s. So 4:88s and an auto should do good. Besides, your main concern is street so it is a better choice for you

Ya. Mine is driveable as is. But she's a dog and fuel economy is crap.

 

I'm thinking about regearing. I have 325/60 tires which measure 35" mounted. I'm leaning toward 5.13. Does anyone have 5.13's on a 3.6 pentastar?

 

5.13's with 35's is an overkill. To put it in perspective, I geared my crawler on 40's and one ton axles to 5.13 to get a good blend between road and hardcore trail use.

Max gear ratio for 35's should be 4.88 (4.56 is comfortable for both highway and trail). On stock axles, to include the dana 44, high ratios can overstress the ring/pinion/and diff housing.

 

I currently have 4:56 with 35's and I'm not happy with it, I'm planning on upgrading to 5:13 and may move to 37's.

 

You running 44's front and rear Terry?

 

I've got a 2012 auto JKUR running 35's with the stock 4.10's and of course the 3.6L Jesus Engine. I'm constantly using the "auto-stick" to upshift when driving on pavement anywhere above 45MPH. It'll just sit at the upper end of the RPM range (not quite in the redline zone) unless I manually hit the auto-stick to upshift. I had everything professionally calibrated using a ProCal so I think all the shift-points should be optimized for my current set-up. That being said it looks like I'm just going to need to regear however like a lot of people here I'm struggling to figure out which gearing would be the best for my set-up (4.88, 5.13, 5.38).

Any recommendations on the best gearing for my set-up? Also, excuse my ignorance on this topic but can someone here explain how I should expect the performance of my Jeep to change when I regrear. I'm perfectly happy with the trail performance of my Jeep at this point (no complaints at all), my only complaint is pavement performance. So when I regrear how will that effect:

1. Performance when accelerating from a full stop, should I expect it to be more "jerky" or will that not be an issue?
2. Shifting from gear to gear, should I expect it to be more "jerky" or will it shift just as smoothly as the stock 4.10's.
3. Higher speeds (45MPH+) should I expect the regearing to resolve the issue with needing to manually upshift in order to keep the tach out of higher RPM range?
4. Finally, from an overall perspective what should I expect to see change from regearing. What are the overall pros/cons of rehearing?

Sorry for the novel here but I'd really like to get some useful information from those of you who have a much better understanding of gearing than I do. Thanks! :thumb:

 

^x2

Someone please answer this.

 

I've been kicking with 4.88 for about 2 months now, Love em, but I have a 6 speed.

 

Any regret(want 5.13)?