What gears ratio for a 2012 on 37's?
02-02-2012, 06:51 AM
#12
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Actually I'm really curious about how it drives on the 4.10s myself. We went ahead and did the gear change while everything was apart for the lift and sleeves, new axle shafts, etc.
02-02-2012, 08:22 AM
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I have a 12 auto with 37s and 4.88 and seems like its about perfect except at highway speed of around 70 the rpm's are around 3000. So I like to travel around 60 and get a little better mpg.
02-02-2012, 08:31 AM
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02-02-2012, 08:45 AM
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Originally Posted by wayoflife
hmmm, that's really good info right there. i was afraid that might be the case and was wondering if 4.56's might be the better way to go. i've ridden in a 2012 with 35's and stock gears and thanks to the 3.6L, i couldn't even tell if there was a loss in power. being that i have 4.10s, i'm hoping the loss will be insignificant at best and, if so, i may leave well enough alone.
02-02-2012, 08:55 AM
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Interesting info; this topic got me wondering if the Auto is geared lower in OD then the Manual. Found this doc:
h t t p://www.media.chrysler.com/dcxms/assets/specs/2012_JP_Wrangler_Unltd_Specs.pdf
Apparently the Automatic is geared lower in OD. Per that pdf from Chrysler, for the Manual top gear is 0.797 and for the Automatic top gear is 0.83.
Snapshot in case url doesn't work:
TRANSMISSION: NSG 370—MANUAL, SIX-SPEED OVERDRIVE
Availability Standard on all models
Description Synchronized in all forward gears and Reverse, multi-rail shift system with
top-mounted shift lever
Clutch Hydraulic actuation
Gear Ratios
1st 4.46
2nd 2.61
3rd 1.72
4th 1.25
5th 1
6th 0.797
Reverse 4.06
TRANSMISSION: W5A580 AUTOMATIC, FIVE-SPEED OVERDRIVE
Availability Optional
Description Adaptive electronic control or Electronic Range Select (ERS)
driver-interactive manual control and electronically modulated torque
converter clutch
Gear Ratios
1st 3.59
2nd 2.19
3rd 1.41
4th 1
5th 0.83
Reverse 3.16
h t t p://www.media.chrysler.com/dcxms/assets/specs/2012_JP_Wrangler_Unltd_Specs.pdf
Apparently the Automatic is geared lower in OD. Per that pdf from Chrysler, for the Manual top gear is 0.797 and for the Automatic top gear is 0.83.
Snapshot in case url doesn't work:
TRANSMISSION: NSG 370—MANUAL, SIX-SPEED OVERDRIVE
Availability Standard on all models
Description Synchronized in all forward gears and Reverse, multi-rail shift system with
top-mounted shift lever
Clutch Hydraulic actuation
Gear Ratios
1st 4.46
2nd 2.61
3rd 1.72
4th 1.25
5th 1
6th 0.797
Reverse 4.06
TRANSMISSION: W5A580 AUTOMATIC, FIVE-SPEED OVERDRIVE
Availability Optional
Description Adaptive electronic control or Electronic Range Select (ERS)
driver-interactive manual control and electronically modulated torque
converter clutch
Gear Ratios
1st 3.59
2nd 2.19
3rd 1.41
4th 1
5th 0.83
Reverse 3.16
02-02-2012, 08:55 AM
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Originally Posted by wayoflife
ah, that's right. 4.10s are an option now.