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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 11-29-2009, 12:39 AM
greatdays2gether greatdays2gether is offline
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MIXING GEAR RATIOS IN 4X4 TRUCKS?

iI HAVE AN 97 F150 4X4 3.55 GEARS IN THE REAR DOES IT MATTER IF I CHANGE THE GEAR RATIO IN THE REAR TO A 4.10 4.11 WILL IT AFFECT THE FOUR WHEEL DRIVE?
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Old 11-29-2009, 01:08 AM
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Yes, your gears have to be the same ratio in the rear as in the front. Otherwise the drivtrain will bind severly and deffinatly break something
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Old 11-29-2009, 05:02 AM
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Yes, your gears have to be the same ratio in the rear as in the front. Otherwise the drivtrain will bind severly and deffinatly break something
Exactly...Both axles must be of the same gear ratio, just like all 4 tires must be the same diameter. Binding and breaking of gears will result...
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Old 11-29-2009, 07:05 AM
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Well not exact. Your truck has 3:55 in the rear and 3:54 in the front. \If you went to 4:10 in the rear you would need 4:09 in the front. The fronts for what ever reason are geared lower, i think to pull better
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Old 11-29-2009, 07:49 AM
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I have seen vehicles with lower gears in the rear for bigger paddle tires running at the dunes. Stock gearing up front, depending on front tire size of course.
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Old 11-29-2009, 01:49 PM
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I my wood hauler I have 3.73s in the rear and 3.55 up front. On gravel its fine. Gets me thru the mudholes just fine. just make sure I pull it out of 4x4 before I hit the highway
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Old 11-29-2009, 11:21 PM
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I my wood hauler I have 3.73s in the rear and 3.55 up front. On gravel its fine. Gets me thru the mudholes just fine. just make sure I pull it out of 4x4 before I hit the highway
Only a matter of time before something breaks there.
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Old 11-30-2009, 01:56 AM
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If you're running the same size tires front and rear you should have the same ratio in the front and rear axles.

I can see it working with a different ratio if you ran larger tires on the rear. (Such as the paddle tires mentioned.)
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Old 11-30-2009, 01:56 AM
 
 
 
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