Lower Gearing vs. MPG
08-25-2009, 03:53 PM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0
Lower Gearing vs. MPG
Ive heard the putting lower gears in kills your gas MPG. Can someone explain this to me.
Here is my general understanding:
Say for example, that you have 3.55's now (most of us do stock) and was changed to 4.56's. On the stock setup the rear wheel should do roughly 3.55 rotations for every 1 rotation of the drive-shaft and with the 4.56 gears the rear wheel should do roughly 4.56 rotations for every 1 rotation of the drive-shaft.
Am i wrong in my thinking? Shouldn't it take less effort to get up to speed with the lower gears, ultimately using less gas under throttle?
Here is my general understanding:
Say for example, that you have 3.55's now (most of us do stock) and was changed to 4.56's. On the stock setup the rear wheel should do roughly 3.55 rotations for every 1 rotation of the drive-shaft and with the 4.56 gears the rear wheel should do roughly 4.56 rotations for every 1 rotation of the drive-shaft.
Am i wrong in my thinking? Shouldn't it take less effort to get up to speed with the lower gears, ultimately using less gas under throttle?
08-25-2009, 05:12 PM
#4
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Year: 1998
Model: Cherokee
Engine: 4.0L w/ AFE stage 2, bored TB
Lowering the gearing helps put the engine back in the power band and helps pull the added weight of larger wheels/tires and bumpers and all.
08-25-2009, 05:26 PM
#5
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Year: 1998
Model: Cherokee
Engine: 4.0
The more gear the less the engine has to work.............but unless you match it with the proper tire size...the extra RPM could cost you MPG.
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