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Old November 3rd, 2011, 09:57 AM   #1
Mulely
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Default Toss up between gears

Time for tons on my CJ. Right now I have a 383/AX-15/stock D300 and ~38" tires.
I don't know if I want 5.13's or 5.38's. I DD this beast but mostly in town and to school with the occasional trip north. What do you guys suggest from experience. I'll have the 38's for few more years and might go up to a 39-40 but I might not.

Shanks,
Dave
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Old November 3rd, 2011, 03:01 PM   #2
Fullsize4life
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You really wont even notice the difference in the two. For myself i would get the 5.13s due to the extra tooth on the pinion gear.
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Old November 3rd, 2011, 03:09 PM   #3
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what do you think about a nv4500/whatever t-case? what is your current case?

what are your motor specs and current driveline parts? there's a lot you can do to get your ideal output gearing.
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Old November 3rd, 2011, 04:13 PM   #4
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I don't think you'd notice a difference between the two.

How is the 383 cammed?

With the 5.13s, you are probably going to be 2200-2300 rpm @ 60mph. Kinda depends on how tall your tires actually are. (My numbers show 2188 rpm, actually)

With the 5.38s, that goes to 2295, so its only 107 rpm difference between the two....
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Old November 3rd, 2011, 04:33 PM   #5
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Here is a Gear Ratio Calculator that helped me decide:

http://www.grimmjeeper.com/gears.html
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Old November 3rd, 2011, 04:35 PM   #6
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5.13
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Old November 3rd, 2011, 05:19 PM   #7
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Eventually I'd love to have an NV4500 but it's gotta be a screamin deal type of thing or the AX15 has to explode. Which ever comes first.
The 383 is cammed pretty hot. I think the cam # is like 12-250-3 or something like that. real down low power just isn't there but after 2k its pretty rowdy.

So it seems like what ever gear set I find at the best price will do me just fine. The 4.56's I currently have just leaves a bit to be desired with the tires I have.
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Old November 3rd, 2011, 05:40 PM   #8
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Do you have room for a doubler? If you build your own drive shafts, you can do it for the same price or less of a gear swap. Then no worries about the 5.13s pinion size and you have all sorts of ranges to play with.
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Old November 4th, 2011, 08:20 AM   #9
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Man, it's in a CJ7. There's barely room for mud under the body of that thing lol.
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Old November 4th, 2011, 08:25 AM   #10
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5.38
Just do.
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Old November 7th, 2011, 09:23 PM   #11
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Why not just go with a tera low 4 to 1 ratio in the transfer case? You will still have the daily driver ability while having the lower ratio for off road. Good chance you will need to move up to larger axles to handle the larger tires your talking about; making any ratios in the older axles useless. By changing the ratio in the case you can switch the ratio in the axles(when you upgrade the axles) to a more street friendly ratio(3.73 or 4.11) saving you gas mileage/motor wear while still having a great off road ratio.
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Old November 7th, 2011, 09:33 PM   #12
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Quote:
Originally Posted by cerial View Post
Why not just go with a tera low 4 to 1 ratio in the transfer case?
this.



but if you stick to doing axle gears = 5.13s
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