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Gear Ratio?????

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Old 07-22-2009, 07:55 PM   #1
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Default Gear Ratio?????

i have a 2004 ford F150 XLT 4x4 with the 4.6. I had the stock 255/70R17 tires on it but decided to go with a larger tire Lt295/75/R17 (Nitto Terra Grapplers) with the help of a 2.5in leveling kit.It is all stock except for true dual exahust, cold air intake, and hypertech max energy. With the new tires on it feels sluggish taking off and pulling a trailer. Should i change the gear ratio. What ratio should i use and what axles do i have front and rear. THANKS
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Old 07-22-2009, 08:08 PM   #2
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i have a 2004 ford F150 XLT 4x4 with the 4.6. I had the stock 255/70R17 tires on it but decided to go with a larger tire Lt295/75/R17 (Nitto Terra Grapplers) with the help of a 2.5in leveling kit.It is all stock except for true dual exahust, cold air intake, and hypertech max energy. With the new tires on it feels sluggish taking off and pulling a trailer. Should i change the gear ratio. What ratio should i use and what axles do i have front and rear. THANKS

Don't waste your money..
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Old 07-22-2009, 08:09 PM   #3
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thx
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Old 07-22-2009, 08:20 PM   #4
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Originally Posted by steven13sweet View Post
i have a 2004 ford F150 XLT 4x4 with the 4.6. I had the stock 255/70R17 tires on it but decided to go with a larger tire Lt295/75/R17 (Nitto Terra Grapplers) with the help of a 2.5in leveling kit.It is all stock except for true dual exahust, cold air intake, and hypertech max energy. With the new tires on it feels sluggish taking off and pulling a trailer. Should i change the gear ratio. What ratio should i use and what axles do i have front and rear. THANKS
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thx
No problem.
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Old 07-22-2009, 08:35 PM   #5
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Being that it is the 4.6 and having the 4r70 trans, i would regear to a 4.10 ratio. i know guys who ripped out their trannies in less than 30k miles with only 33's.
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Old 07-22-2009, 08:39 PM   #6
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Being that it is the 4.6 and having the 4r70 trans, i would regear to a 4.10 ratio. i know guys who ripped out their trannies in less than 30k miles with only 33's.

I'm not sure it'd be worth 1500 bucks.
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Old 07-22-2009, 08:46 PM   #7
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I'm not sure it'd be worth 1500 bucks.
you can do it for around 800-1000 bucks if you drop the front diff yourself.

you can get gears for under 600, plus labor, alignment, fluid, etc. i got a quote of 300 bucks labor to take my truck into the dealer, they will do the rear and i will bring in the front diff

Last edited by ATOM; 07-22-2009 at 08:48 PM.
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Old 07-22-2009, 08:51 PM   #8
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you can do it for around 800-1000 bucks if you drop the front diff yourself.

you can get gears for under 600, plus labor, alignment, fluid, etc. i got a quote of 300 bucks labor to take my truck into the dealer, they will do the rear and i will bring in the front diff

Let's be honest.. I don't know or claim to know the mechanical knowledge of the OP, but most people are not willing to drop their own front diff.
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Old 07-22-2009, 09:06 PM   #9
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Default Different, But Not That Different:

Your change will have your speedo reading about 10% slow....60mph shown will be 66.5mph true.

If you take that into consideration, I don't see why you would want to spend the bucks and the time to "re-gear" your differentials. Just use the lower gears more often.

Last edited by Kattumaram; 07-22-2009 at 09:11 PM.
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Old 07-22-2009, 11:10 PM   #10
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Let's be honest.. I don't know or claim to know the mechanical knowledge of the OP, but most people are not willing to drop their own front diff.
I am just throwing it out there, i have no idea how mechanically inclined the OP is either, i am just saying that it can be done for alot cheaper than most think, if they are willing to get there hands dirty
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