Topic: auto gearing

[drunkencityworker]

I am going to start getting stuff for regearing. i run 305/70. somewhere between 33-35. i know most would go 4.88. but i have an auto. should i run 4.56? its a dd and maybe once a month wheeler

[jcsanders79]

I have an auto with 4.88's and 33's.  I don't think that the 4.56 would be worth the trouble.

[drunkencityworker]

How is it at hwy speeds?

[Jesse-James]

I run 4.56 with 35's in my auto. The 8.8 was already geared or I would have done 4.88's but it does good on the highway. Not perfect but good.

[jcsanders79]

I can keep up, except for long upgrades.  That said, as soon as I can afford new lockers I'll be putting a D-44 upfront so I can go lower.

[TahoeYJ]

I can keep up, except for long upgrades.  That said, as soon as I can afford new lockers I'll be putting a D-44 upfront so I can go lower.

x2 I'm running 4.88's with 35's and a manual and on long, steep grades I still have a bit of trouble but overall it's fine. I have no issue running 75+ on the highway most of the time

[jagular7]

I'm running on 35's with an auto. I went with 4.88s as that is the tallest tire I will run and it is the deepest set available at the time for the front D30 for a TJ. at 67 mph (GPS as speedo shows 72), I'm hitting 3200rpms or so.

[Bounty Hunter]

Go with the 4.88 gears, you will be much happier.

That being said, I run 35" tires, 5spd, and 5.38 gears and it's perfect.

[FourbangerYJ]

That being said, I run 35" tires, 5spd, and 5.38 gears and it's perfect.

If I can't find a set of 37's for 15 inch wheels I like, I'll go back to 35's. I was wondering what that set up would be like. I had a feeling it would be just fine.
Good to hear.

[Bounty Hunter]

I run 35" radials on the road and 36" bias TSL's to the trail, and both do just fine with 5.38, rocking down the interstate comfortably at 70+.

[TahoeYJ]

If I can't find a set of 37's for 15 inch wheels I like, I'll go back to 35's. I was wondering what that set up would be like. I had a feeling it would be just fine.
Good to hear.

I'm surprised you're willing to sacrifice that little bit of ground clearance with those beefy leafs you run 

[FourbangerYJ]

I'm surprised you're willing to sacrifice that little bit of ground clearance with those beefy leafs you run 

I ran 35's for years with the same setup. The biggest problem was hitting the frame mounted spring hanger on the rear, after moving the axle back 4 inches. Trimming the mount and going to a larger tire got me within a 1/2 inch of my buddy running 35's and the stock wheel base.
My problem with tires is I don't drive much so they pretty much don't wear out as far as tread life is concerned. I have not bought a new set of tires in atleast 12 years. I have had great luck finding used stuff for pretty good deals. Another problem is few company's now make a 37 on a 15 inch wheel. Mostly what is left is made by Interco. No one I run with runs Interco tires so it's hard to get a feel about how they do. Mostly I hear horror stories about how they don't balance well or run fairly smooth on the HWY. The M16's and the Truxus MT both look like a pretty good tire.
 

I run 35" radials on the road and 36" bias TSL's to the trail, and both do just fine with 5.38, rocking down the interstate comfortably at 70+.

I can run 70+ on the flat with no problem. It could use a couple hundred more RPM but overall it's not to bad. I can take most of the hills around here in 4th. Climbing the Grapevine on the I-5 there is a few spots where I need 3rd I was more worried about being overgeared and running in the upper 3K's doing 70. I guess I should look at a RPM calc.