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Diff ratios

 
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Old 02-14-2019, 10:59 PM
Mupham
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Diff ratios

new to the site and finding my way around . I have a 2000 f150 Lariet 4.6 litre . I have put 35 inch wheels on it which has obviously messed with the gearing . Wander if someone can sudjest what gearing I need . Truck is used primarily on the road , nothing too aggressive . Appreciate some help. Bogs down on Inclines
 
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Old 02-14-2019, 11:21 PM
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Welcome to FTE.

4.10s sound about right. What's in it now? 4x4 or 4x2?
 
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Old 02-15-2019, 12:16 AM
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Not sure what is in it , I would presume standard , what ever that is . It's 4x4 . Thanks for the reply
 
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Old 02-15-2019, 08:42 PM
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Never mind what is in there now. Who knows what previous owners did. Check the door sticker. Then you will know what the stock gear ratio is suppose to be.

Now you can decide if you want to return the vehicle to stock specs, by installing the OEM size gears, and OEM size tires. Or stay with the 35" tires, regear accordingly, reprogram your transmissions shift points to operate correctly, and reprogram you car's computer to read correctly at the speedometer and odometer.
https://tiresize.com/gear-ratio-calculator/
.
 
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Old 02-16-2019, 10:51 AM
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The 4.6 is already underpowered to begin with, I would get at least 4.56 gears with 35s.
 
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Old 02-19-2019, 05:51 PM
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Your right about the 4.6 being underpowered , don't know why they ever used them, getting bit confused some say the 4:56 too aggressive for road use , I am in the Philippines , difficult to get much advice here
 
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Old 07-12-2019, 09:32 AM
David Karpinski II
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Dear Mupham,
What size tires are you running now? What's the current gear ratio you have in it know? What speeds do you normally travel at? Highway speed/ city speeds? All will help you in finding out what gear ratio to pick.
 
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Old 07-14-2019, 07:31 PM
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Hi David , thanks for your reply. Tyres I have on it are 35 x 12.5. 17 inch rims . Little highway running 100kms /hr but mainly around town. I would imagine the diff ratio at the moment would be standard , what ever that is , not all that up on this stuff, No real off-road work , don't need anything too aggressive .
Thanks
 
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Old 07-14-2019, 11:56 PM
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Old 07-15-2019, 03:06 AM
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Mupham,

refer to the door jamb sticker for your factory gear ratio. Look at the door sticker.
 

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