3.21 vs 3.73 Axle Ratio..what's the difference? - Jeep Wrangler Forum
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Old 09-10-2010, 05:48 PM   #1
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3.21 vs 3.73 Axle Ratio..what's the difference?

I see you can upgrade from the 3.21 to the 3.73 axle ratio. Do you guys out there think it is worth it? What does it do..or what is the difference?

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Old 09-10-2010, 05:56 PM   #2
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What are your plans for tire size? I mean in the end when the Jeep is finished.

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Old 09-10-2010, 05:57 PM   #3
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I assume you're talking about a manual trans ... pretty sure the auto comes with 3.73 by default.

That number represents the gear ratio in the differentials. A higher number means more torque to the wheels, but it also means your engine runs at higher RPM's when cruising on the freeway.

If you ever plan on towing or running 32" tires you want it. If you're going bigger than 32" you may want to look into after market options which are(EDIT LOWER . ;-)

Someone else can probably give you a better answer, but my short answer is YES.
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Old 09-10-2010, 06:00 PM   #4
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Quote:
Originally Posted by Croakus View Post
I assume you're talking about a manual trans ... pretty sure the auto comes with 3.73 by default.

That number represents the gear ratio in the differentials. A higher number means more torque to the wheels, but it also means your engine runs at higher RPM's when cruising on the freeway.

If you ever plan on towing or running 32" tires you want it. If you're going bigger than 32" you may want to look into after market options which are higher.
EDIT: He means "lower" The higher the number, the lower the gear ratio.

Someone else can probably give you a better answer, but my short answer is YES.

See above: Red text is me. Bold text is OP that I'm referring to.
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Old 09-10-2010, 06:05 PM   #5
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Originally Posted by Ageless Stranger View Post
See above: Red text is me. Bold text is OP that I'm referring to.
Had time to edit! Good catch ... I meant to say the number is higher, but you're right - the correct term is lower gear.
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Old 09-10-2010, 06:29 PM   #6
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"Lower gearing" is numerically higher.

3.73's will be better for you with larger tires, but most say still are not enough and skip right to 5.13" when they get 35" tires or larger with the JK's. Still even then, the 3.73's will be better for the highway and give you more "seat of your pants" power.
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Old 09-11-2010, 02:39 AM   #7
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Thanks Guys

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