I need help!

[MR.Ty]

I just put 4.88's in my JKU. I'm on 35's running 2k rpm's at 70. I did hook up my tuner and change the shift points and tire size in the computer.

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I also agree that isn't right. I run around 2800 rpm with 35s and 4.88s.

 

[jeffj]

I just put 4.88's in my JKU. I'm on 35's running 2k rpm's at 70. I did hook up my tuner and change the shift points and tire size in the computer.

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That's because you have the old motor. The 3.6 is totally a different animal


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[the_debtenator]

That's because you have the old motor. The 3.6 is totally a different animal


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Even with the 3.8 that rpm isn't right.


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[notnalc68]

3.6L, 315/70 R17 that measured about 33.5". Calibration done with ProCal. 4.10 gears.




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[Frydaddy]

3.6L, 315/70 R17 that measured about 33.5". Calibration done with ProCal. 4.10 gears.
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Youve just scared me out of 4.56s. I do quite a few miles at 80mph and dont want to kill my mpg. who knows. Maybe i can find a Rubicon take-off set.

 

[notnalc68]

Youve just scared me out of 4.56s. I do quite a few miles at 80mph and dont want to kill my mpg. who knows. Maybe i can find a Rubicon take-off set.

To be honest, it didn't get any better mileage with stock tires, running around 2700. It was much more pleasant to drive, not down shifting as much, and I run 75-80 on the interstate. I'm going 4.88, when I regear, and it's a daily driver.


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[tanmanjk]

Youve just scared me out of 4.56s. I do quite a few miles at 80mph and dont want to kill my mpg. who knows. Maybe i can find a Rubicon take-off set.

I believe the ring gear is thicker and won't work. If I remember

 

[Frydaddy]

I believe the ring gear is thicker and won't work. If I remember

Yea theres a carrier change, and/or an over-under swap to deal with depending on where youre starting, but its all do-able.

 

[notnalc68]

Youve just scared me out of 4.56s. I do quite a few miles at 80mph and dont want to kill my mpg. who knows. Maybe i can find a Rubicon take-off set.

4.56 would put you about like a stock Rubicon with stock tires. You'll find the engine shifts less at Hwy speeds. I ran 80 mph on the way home, just to check for you. I was close to 2800. 75 mph was around 2600.


http://wayalife.com/showthread.php?38796-The-building-of-Anvil-II-The-Deuce

 

[Rocklobsta]

3.21s with 35s I was running 1600 @ 65 getting about 13.5 mpg average. 4.56s now running 2400 @ 65 getting 17 mpg average with Procal tire and gear correction. I do 60-70% hwy. 4.56s have much more pull on acceleration and passing than stock. You won't be disappointed with that gear ratio. I went back and forth too and couldn't be happier with the 4.56.

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[notnalc68]

3.21s with 35s I was running 1600 @ 65 getting about 13.5 mpg average. 4.56s now running 2400 @ 65 getting 17 mpg average with Procal tire and gear correction. I do 60-70% hwy. 4.56s have much more pull on acceleration and passing than stock. You won't be disappointed with that gear ratio. I went back and forth too and couldn't be happier with the 4.56.

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True. I think it burns more fuel, shifting more at highway speeds.