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Super Moderator
Joined: Aug 2003
Posts: 25,479
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From: Isanti, MN
Welcome to FTE!
You don't give us much to go on, so let me ask. What are you trying to accomplish? Better performance? Your avatar shows a lifted truck on larger wheels, what else has been done to it?
You don't give us much to go on, so let me ask. What are you trying to accomplish? Better performance? Your avatar shows a lifted truck on larger wheels, what else has been done to it?
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Logistics Pro
Joined: Apr 2011
Posts: 4,744
Likes: 5
From: Earth
Hi welcome to FTE, first off if your wanting HP your looking into slightly bigger injectors, 4” exhaust and as for that K&N please bin the POS all it will do is let more dirt and finer particles into the turbo and shorten its life, go with an S&B or the 6637 set up.
Anyways I’m hoping off my soapboxe now, if your wanting HP your going to be needing more fuel and air and the only way to move more of each is to upgrade the supporting areas (exhaust, intake and fuel delivery)
Anyways I’m hoping off my soapboxe now, if your wanting HP your going to be needing more fuel and air and the only way to move more of each is to upgrade the supporting areas (exhaust, intake and fuel delivery)
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Posting Guru
Joined: Jul 2017
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Someone needs to check my numbers, I'm eyeballing this.
I think your tires are about 2" taller than stock (about 31.5 vs 33.5 diameter).
Assuming you have 3.73 gears now, you are at about 3.5 effective gearing compared to stock tire size.
4.11 would get you about 10% from where you are now (about 1/2 undoing the tire increase, and half an increase over stock. 4.30 would be about 20% more from where you are now. Assuming you are starting from 3.73...
Any chance a previous owner did gears? Is your speedometer accurate or does it read about 6% low? If it does read low, I would think the truck has stock gears combined with the bigger tires. Still need to check for axle codes to know what you have assuming they are stock.
I think your tires are about 2" taller than stock (about 31.5 vs 33.5 diameter).
Assuming you have 3.73 gears now, you are at about 3.5 effective gearing compared to stock tire size.
4.11 would get you about 10% from where you are now (about 1/2 undoing the tire increase, and half an increase over stock. 4.30 would be about 20% more from where you are now. Assuming you are starting from 3.73...
Any chance a previous owner did gears? Is your speedometer accurate or does it read about 6% low? If it does read low, I would think the truck has stock gears combined with the bigger tires. Still need to check for axle codes to know what you have assuming they are stock.
Fleet Mechanic
Joined: Jan 2012
Posts: 1,841
Likes: 6
The gear ratio does not affect the speedometer only tire size will. You also ain’t getting gears in your truck for $800 if you want to stick with that same size tire now is the time to decide if you want to do gears, if you want to stay with the 315’s I’d go 4.56’s this is also the time to upgrade to better limited slip or locker if you want to do that more money but a good upgrade. If that money is just burning a hole in your pocket and you gotta spend some of it I would get the spd y pipe and put that in instead of the necked down crap ford went with if you haven’t done anything to the exhaust. But the only thing that’s going to give you what want in your truck with a 5.4 for a reasonable amount of money is gears.
Fleet Mechanic
Joined: Jan 2012
Posts: 1,841
Likes: 6
Hi welcome to FTE, first off if your wanting HP your looking into slightly bigger injectors, 4” exhaust and as for that K&N please bin the POS all it will do is let more dirt and finer particles into the turbo and shorten its life, go with an S&B or the 6637 set up.
Anyways I’m hoping off my soapboxe now, if your wanting HP your going to be needing more fuel and air and the only way to move more of each is to upgrade the supporting areas (exhaust, intake and fuel delivery)
Anyways I’m hoping off my soapboxe now, if your wanting HP your going to be needing more fuel and air and the only way to move more of each is to upgrade the supporting areas (exhaust, intake and fuel delivery)
Logistics Pro
Joined: Apr 2011
Posts: 4,744
Likes: 5
From: Earth
again sorry i was on my phone and thought it was a diesel, my bad about that part I do stand corrected on that (posting on my PC now with larger screen)
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