gear ratio change
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gear ratio change
hey yall i got a 2009 stx with a 4.6 2v i currently got a 3.55 ratio open diff.
I just put some 33" bf goodrich all terrains on and i would like to change the gear ratio to 4.10. what all do i need to get, what size, and what brand of gears do i need to get? and can i get this done at the dealership?
I just put some 33" bf goodrich all terrains on and i would like to change the gear ratio to 4.10. what all do i need to get, what size, and what brand of gears do i need to get? and can i get this done at the dealership?
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Joined: Nov 2009
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From: NC
Since you're pricing the mod, you'll also need a flasher to reprogram the GR and TS. You can either get a tuner (I recommend you contact Mike Butler at 5Star Tuning) or Hypertech makes a device that allows you to correct the GR and TS, but doesn't allow you to adjust performance.
I also assume you understand that your dealer will probably deny any claims on your drivetrain warranty. If the warranty is important to you, you may to check with the dealer.
I also assume you understand that your dealer will probably deny any claims on your drivetrain warranty. If the warranty is important to you, you may to check with the dealer.
Posting Guru
Joined: Jan 2006
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From: Arizona/Texas
With the correct gear ratio to compensate for the bigger tires, you may not need to calibrate for the bigger tires. If you do, the dealer can do it for you.
And I would bet that if you pay the dealer to do it with factory Ford parts, it won't affect your warranty.
Even if you pay someone else to do it, only the parts changed or directly effected by the change would be out of warranty.
If you have a good company do the work, they will warrant the work and the parts. I had mine done by 4wheelparts. Never had a problem.
And I would bet that if you pay the dealer to do it with factory Ford parts, it won't affect your warranty.
Even if you pay someone else to do it, only the parts changed or directly effected by the change would be out of warranty.
If you have a good company do the work, they will warrant the work and the parts. I had mine done by 4wheelparts. Never had a problem.
Posting Guru
Joined: Nov 2009
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From: NC
msg - you are correct, but you'd have to calculate the effective GR with the new gears and larger tires (accounting for the squish).
As far as the dealer re-programming the PCM - maybe. The Ford software is somewhat limited in the options for TS (not sure if this is true for the GR too).
Lastly, I understand what the Magnuson Moss Warranty Act says, but how it's implemented/enforced depends on the dealer (and their warranty repair record with Ford). It wouldn't be much of a stretch for the 'wrong' dealer to reject a transmission claim based on the gears and tires. It's then up to the owner to prove the modifications didn't cause the failure.
As far as the dealer re-programming the PCM - maybe. The Ford software is somewhat limited in the options for TS (not sure if this is true for the GR too).
Lastly, I understand what the Magnuson Moss Warranty Act says, but how it's implemented/enforced depends on the dealer (and their warranty repair record with Ford). It wouldn't be much of a stretch for the 'wrong' dealer to reject a transmission claim based on the gears and tires. It's then up to the owner to prove the modifications didn't cause the failure.
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Joined: Nov 2009
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From: Ft Wayne, IN
msg - you are correct, but you'd have to calculate the effective GR with the new gears and larger tires (accounting for the squish).
As far as the dealer re-programming the PCM - maybe. The Ford software is somewhat limited in the options for TS (not sure if this is true for the GR too).
Lastly, I understand what the Magnuson Moss Warranty Act says, but how it's implemented/enforced depends on the dealer (and their warranty repair record with Ford). It wouldn't be much of a stretch for the 'wrong' dealer to reject a transmission claim based on the gears and tires. It's then up to the owner to prove the modifications didn't cause the failure.
As far as the dealer re-programming the PCM - maybe. The Ford software is somewhat limited in the options for TS (not sure if this is true for the GR too).
Lastly, I understand what the Magnuson Moss Warranty Act says, but how it's implemented/enforced depends on the dealer (and their warranty repair record with Ford). It wouldn't be much of a stretch for the 'wrong' dealer to reject a transmission claim based on the gears and tires. It's then up to the owner to prove the modifications didn't cause the failure.
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Posting Guru
Joined: Jan 2006
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From: Arizona/Texas
If you look around there are many Ford Dealerships that actually install lift kits, posi kit upgrades, gear ratio changes, and a whole bucket full of performance stuff. We have several in Arizona that specialize in Ford Performance upgrades. SVT certified I guess they are called.
And yes the technician at a Ford dealership, with a mere key stroke and adjust for tire size and gear ratio changes. Although it has to be within the allowable perimeters.
Just a quick google search and you can see what this Ford Dealer will do. If you have a Dealer that will not work with you, get another dealer.
Berge Ford: Lifted Truck Headquarters
And yes the technician at a Ford dealership, with a mere key stroke and adjust for tire size and gear ratio changes. Although it has to be within the allowable perimeters.
Just a quick google search and you can see what this Ford Dealer will do. If you have a Dealer that will not work with you, get another dealer.
Berge Ford: Lifted Truck Headquarters
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Posting Guru
Joined: Jan 2006
Posts: 1,490
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From: Arizona/Texas
hey yall i got a 2009 stx with a 4.6 2v i currently got a 3.55 ratio open diff.
I just put some 33" bf goodrich all terrains on and i would like to change the gear ratio to 4.10. what all do i need to get, what size, and what brand of gears do i need to get? and can i get this done at the dealership?
I just put some 33" bf goodrich all terrains on and i would like to change the gear ratio to 4.10. what all do i need to get, what size, and what brand of gears do i need to get? and can i get this done at the dealership?
gear ratio calculator
Gear Ratio Calc
Posting Guru
Joined: Jan 2006
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From: Arizona/Texas
These people are serious about 4 wheeling.
4x4 related Calculators, Crawl Ratio, Gears Tires Sizes, etc..
4x4 related Calculators, Crawl Ratio, Gears Tires Sizes, etc..
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