04 4.6 Need More Power
Senior Member
Joined: May 2006
Posts: 1,177
Likes: 0
From: Baton Rouge, LA
Originally Posted by Jordan not Mike
Depends on where you start.
Assuming everything stays the same but you just change gears:
- take the smaller ratio, divide it by the larger ratio
- multiply by 100.
- subtract this from 100
This will give yo the change as a percentage.
Im my case:
Started with 3.31
Went to 4.10
Doing the calcuation, I get 19.3. That is the percent change in gear reduction. And that is also the percentage incrase in RPM at any given speed.
I even verified the calculations with my new gears in my truck. It was spot-on.
So if I was turning 2000 rpm at 70mph before, I'd turn 2386 rpm after the change.
Assuming everything stays the same but you just change gears:
- take the smaller ratio, divide it by the larger ratio
- multiply by 100.
- subtract this from 100
This will give yo the change as a percentage.
Im my case:
Started with 3.31
Went to 4.10
Doing the calcuation, I get 19.3. That is the percent change in gear reduction. And that is also the percentage incrase in RPM at any given speed.
I even verified the calculations with my new gears in my truck. It was spot-on.
So if I was turning 2000 rpm at 70mph before, I'd turn 2386 rpm after the change.
Last edited by GerRod; Jun 9, 2006 at 08:04 PM.
Former Sponsor
Joined: Mar 1998
Posts: 13,385
Likes: 4
From: Virginia
Hi Bones Auto,
First - buying tuning of of EBay is never going to get you what we deliver - the guys selling on EBay do that primary to try to compete on price, and do not one of them has anywhere near the amount of R&D that we have into this vehicle platform. The members that have been here for some time know that our tuning provides the highest safe & sustainable power gains that can be made via tuning, as we have specialized in tuning the F-series platform longer than anyone else on the planet, literally - almost 15 years now. That is why you cannot get from EBay what you can get from us, there's no comparison - as people have seen here many times during our public Dyno Days, where we show them the difference, and as many have discovered on the street, at the track, when towing, etc.
Now with regard to doing a gear ratio change, you will still need tuning to correct the speedometer & odometer, and if the truck is an automatic, the shift points as well. And no, doing a gear ratio change will NOT reduce your top speed with proper tuning done, as these vehicles are geared so "tall: from the factory that dropping in a set of say, 4.10 gears with stock tires will not reduce top speed - again, that is with the tuning done also, which will be required with gears installed on any 1999 or newer F-series. Doing a gear change is also more expensive than our custom tuning by the way, and while the gear ratio change will get you increased torque multiplication, it will not cause the engine to actually make any more power - and increased engine power is really the place to start.
We advise people to do their modifications in the actual order of bang-for-the-buck - and the single best bang for the buck is doing our Troyer Performance custom tuning, as nothing else for the same or less cost will improve the power, torque, driveability & performance of the vehicle as much.
Doing gear ratio changes is fine, but we generally advise doing that for those who have already done at least the first few bang for the buck mods, and/or those who are building vehicles devoted primarily to drag racing, or vehicles that will spend almost all of the time towing extremely heavy loads.
So I wouldn't rush into anything, but instead, take some time to get more familiar with what is actually going to be more appropriate for your vehicle and how you actually operate it, and what the actual effects & results are, as well as costs, etc.
Please feel free to give us a call if you'd like to go over any of this in more detail, we'll be happy to help advise yo on this - if your situation calls for doing a gear ratio change first, we'll be more than happy to tell you that, but it's best to get proper advice from an F-series performance specialist who really knows these vehicles before making those kinds of decisions - this is just FYI, for whatever it may (or may not) be worth to you, and I hope this brief info helps a bit.
Best of luck whatever you decide!
First - buying tuning of of EBay is never going to get you what we deliver - the guys selling on EBay do that primary to try to compete on price, and do not one of them has anywhere near the amount of R&D that we have into this vehicle platform. The members that have been here for some time know that our tuning provides the highest safe & sustainable power gains that can be made via tuning, as we have specialized in tuning the F-series platform longer than anyone else on the planet, literally - almost 15 years now. That is why you cannot get from EBay what you can get from us, there's no comparison - as people have seen here many times during our public Dyno Days, where we show them the difference, and as many have discovered on the street, at the track, when towing, etc.
Now with regard to doing a gear ratio change, you will still need tuning to correct the speedometer & odometer, and if the truck is an automatic, the shift points as well. And no, doing a gear ratio change will NOT reduce your top speed with proper tuning done, as these vehicles are geared so "tall: from the factory that dropping in a set of say, 4.10 gears with stock tires will not reduce top speed - again, that is with the tuning done also, which will be required with gears installed on any 1999 or newer F-series. Doing a gear change is also more expensive than our custom tuning by the way, and while the gear ratio change will get you increased torque multiplication, it will not cause the engine to actually make any more power - and increased engine power is really the place to start.
We advise people to do their modifications in the actual order of bang-for-the-buck - and the single best bang for the buck is doing our Troyer Performance custom tuning, as nothing else for the same or less cost will improve the power, torque, driveability & performance of the vehicle as much.
Doing gear ratio changes is fine, but we generally advise doing that for those who have already done at least the first few bang for the buck mods, and/or those who are building vehicles devoted primarily to drag racing, or vehicles that will spend almost all of the time towing extremely heavy loads.
So I wouldn't rush into anything, but instead, take some time to get more familiar with what is actually going to be more appropriate for your vehicle and how you actually operate it, and what the actual effects & results are, as well as costs, etc.
Please feel free to give us a call if you'd like to go over any of this in more detail, we'll be happy to help advise yo on this - if your situation calls for doing a gear ratio change first, we'll be more than happy to tell you that, but it's best to get proper advice from an F-series performance specialist who really knows these vehicles before making those kinds of decisions - this is just FYI, for whatever it may (or may not) be worth to you, and I hope this brief info helps a bit.
Best of luck whatever you decide!
