Regearing question
03-07-2017, 12:23 PM
#1
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Regearing question
Okay so I have a 2007 f150 XL with the 4.2. I recently put on a 6 inch lift and put on 36 inch tires. I'm on stock gears. I get around 9 mpg and am looking to get better mileage. I also tow a 16 foot enclose from time to time so I'm also looking to get some more power. My question is what would be my best option for regearing?
03-07-2017, 12:32 PM
#2
Mark
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4:56 / 4:11
03-07-2017, 01:51 PM
#3
Senior Member
Do some research on what would bring you back to stockish numbers, then go 1 lower IMO.
I agree with above but would toss in 4.88s or 5.13s as a consideration depending on how much extra low-end umph you want.
I agree with above but would toss in 4.88s or 5.13s as a consideration depending on how much extra low-end umph you want.
03-07-2017, 07:43 PM
#4
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03-08-2017, 05:35 AM
#5
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36" tires and that motor, I'd go 5.13s for sure. Those tires are very heavy, diffidently go lower than what puts you back to the stock ratio. If I remember correctly the 2007 only has one overdrive gear, not sure what rpm you'll be turning at highway speeds. I run 4.56s with a 2014 5.0, 325/60r20s and I'm at 2200 rpm at 70 mph but 5th and 6th gear are both overdrive.
Re-gearing increased my MPG form 14 to 16 average city /highway.
Current rpm x new gear ratio / by old gear ratio will give you the rpm you'll be running.
Mine was 1700x4.56/3.73= 2078rpm. My speedometer is off a little bit, reason for the 2200rpm @ 70mph I get.
Re-gearing increased my MPG form 14 to 16 average city /highway.
Current rpm x new gear ratio / by old gear ratio will give you the rpm you'll be running.
Mine was 1700x4.56/3.73= 2078rpm. My speedometer is off a little bit, reason for the 2200rpm @ 70mph I get.
Last edited by sohc5.4; 03-08-2017 at 02:27 PM. Reason: More info:
