re-gearing
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Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Engine RPM = (Speed * Transmission Gear Ratio * Final Drive * 336) / Tire Diameter
The E4OD's gears are:
1st: 2.71
2nd: 1.54
3rd: 1.00
OD: 0.71
Use that to find out what RPMs your engine will be at for a given speed and see which gearing you'd be most comfortable with.
For example, if you want to go 65 in overdrive:
4.88
RPM = (65 * 0.71 * 4.88 * 336) / 35
RPM = 2160
4.56
RPM = (65 * .71 * 4.56 * 336) / 35
RPM = 2020
etc.
Play around with it for 1st / 2nd gear getting up to speed. Going 35 in town, etc.
If you're looking for more power, remember that, simply, the more aggressive your gearing, the more power you'll have. So there are more factors than just "more power". Some 5.14s, or even 5.71s are going to net you even more power yet.
You need to decide what you want to do with the vehicle, where you want the power, and where you want to draw the line. Is it a rock crawler? Do you want to use it on the freeway? Etc.
The E4OD's gears are:
1st: 2.71
2nd: 1.54
3rd: 1.00
OD: 0.71
Use that to find out what RPMs your engine will be at for a given speed and see which gearing you'd be most comfortable with.
For example, if you want to go 65 in overdrive:
4.88
RPM = (65 * 0.71 * 4.88 * 336) / 35
RPM = 2160
4.56
RPM = (65 * .71 * 4.56 * 336) / 35
RPM = 2020
etc.
Play around with it for 1st / 2nd gear getting up to speed. Going 35 in town, etc.
If you're looking for more power, remember that, simply, the more aggressive your gearing, the more power you'll have. So there are more factors than just "more power". Some 5.14s, or even 5.71s are going to net you even more power yet.
You need to decide what you want to do with the vehicle, where you want the power, and where you want to draw the line. Is it a rock crawler? Do you want to use it on the freeway? Etc.
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