Does regearing regain overdrive use on the 3.8L
07-29-2013, 05:29 AM
#11
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What range of rpm can I expect to fall in when in overdrive @ 70mph with 5.13's
According to that gearing chart in the FAQ it should be around 2500 rpm @ 70mph but I'm assuming that's not in overdrive, am I correct?
If so I should be looking at around 1800rpm in overdrive, right?
According to that gearing chart in the FAQ it should be around 2500 rpm @ 70mph but I'm assuming that's not in overdrive, am I correct?
If so I should be looking at around 1800rpm in overdrive, right?
07-29-2013, 05:44 AM
#12
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07-29-2013, 05:54 AM
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07-29-2013, 06:01 AM
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What range of rpm can I expect to fall in when in overdrive @ 70mph with 5.13's
According to that gearing chart in the FAQ it should be around 2500 rpm @ 70mph but I'm assuming that's not in overdrive, am I correct?
If so I should be looking at around 1800rpm in overdrive, right?
According to that gearing chart in the FAQ it should be around 2500 rpm @ 70mph but I'm assuming that's not in overdrive, am I correct?
If so I should be looking at around 1800rpm in overdrive, right?
And you can correct for shift points with the ProCal. it allows you to compensate for tire size and gearing. That's what I use because there wasn't anything with a tuning option available when I did my lift and tires. Will be upgrading to a Superchips shortly, though.
07-29-2013, 07:21 AM
#15
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35's + 5.13's here. I pulled a small trailer to Moab with this setup, and it worked well. Depending on wind or terrain I saw anywhere from 13's to 16's MPG.
Without the trailer I get around low 14's in town, and have seen upper 18s on the highway.
I wouldn't go 4.88s as I love the 5.13's.
You will still see some downshifts, but it is greatly improved.
Without the trailer I get around low 14's in town, and have seen upper 18s on the highway.
I wouldn't go 4.88s as I love the 5.13's.
You will still see some downshifts, but it is greatly improved.
07-29-2013, 11:17 AM
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07-29-2013, 11:29 AM
#19
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What range of rpm can I expect to fall in when in overdrive @ 70mph with 5.13's
According to that gearing chart in the FAQ it should be around 2500 rpm @ 70mph but I'm assuming that's not in overdrive, am I correct?
If so I should be looking at around 1800rpm in overdrive, right?
According to that gearing chart in the FAQ it should be around 2500 rpm @ 70mph but I'm assuming that's not in overdrive, am I correct?
If so I should be looking at around 1800rpm in overdrive, right?
(OD for the 3.8's is .69, so to get OD/Off, divide the rpm by .69)
2500 / .69 = 3623 rpm with OD Off
This is useful for people running taller tires who have not regeared.
auto, 35's, 3.73 = 1730 rpm @ 70 (OD On)
1730 / .69 = 2507 rpm @ 70 (OD Off)
auto, 35's, 5.38 = 2495 rpm @ 70
So at 70 mph ... 35's with 3.73's and OD Off = 35's with 5.38's and OD On
07-29-2013, 01:27 PM
#20
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'08JKUR1)--5.38/lockers
2)--auto--42rle
3)-- aux coolers (2)
4)--33.6" hankooks
5)--70 mph--2600 rpm (OD)
6)--17.2 mpg/towing 14.9mpg
7) throttle response--LIGHTNING
8)--JKUR weight 5150lbs--UNLOADED
She will even stay in OD when towing my 1000lb trailer, but
I don't adviseit, because it raises the auto tranny op temps-
JIMBO