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Old 10-09-2013, 09:20 PM   #1
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3.6 auto 5 speed gears question

In my 2012 I have the 3.73 gear option. I noticed when driving on the highway about 60 mph I'm assuming the jeep finds 5th gear and it's cruising at about 1900 rpms. What gears would I need to put me about where I was when the jeep was stock? I'm not sure if I need 4.56 or 4.88 ? I doubt I would need 5.13 but I'm not sure. Thanks guys.

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Old 10-09-2013, 10:15 PM   #2
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Did you maybe leave out the part about your new tires?

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Old 10-09-2013, 10:17 PM   #3
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60 mph on 32 inch tires with 3.73's and the WA580 auto tranny would be 1950 RPM's. Your set up should be closer to 1820 rpm's at 60.

Regardless, 4.10's would actually put you past stock.
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Old 10-09-2013, 10:27 PM   #4
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Quote:
Originally Posted by dgsholar View Post
Did you maybe leave out the part about your new tires?
Whoops sorry 2.5 inch lift and 35s. Thank
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Old 10-09-2013, 10:29 PM   #5
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60 mph on 32 inch tires with 3.73's and the WA580 auto tranny would be 1950 RPM's. Your set up should be closer to 1820 rpm's at 60.

Regardless, 4.10's would actually put you past stock.
Got it but I'd hate to spend all that money just to go from 3.73 to 4.10 so do you think 4.56 would be fine for my set up?
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Old 10-10-2013, 01:11 AM   #6
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4.56 at 1900 would get you 49 MPH. That is gonna cost you. That is what I have and it dropped the mileage. 80 mph is now at 3000 rpm and 16 mpg. 2500 is about 63 mph.
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Old 10-10-2013, 07:31 AM   #7
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Got it but I'd hate to spend all that money just to go from 3.73 to 4.10 so do you think 4.56 would be fine for my set up?
I plugged in your tire size last night, I think they were around 34.6 or something like that.

4.56's would be fine...but it really depends on what you want to do with the vehicle, how heavy your wheels are, your elevation, ect....

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