No Power
No Power
Senior User
Joined: Jun 2005
Posts: 267
Likes: 0
From: La Mesa Ca
my truck has good power- 2002 extra cab lifted 6" with 295/75/16's (33's) and 3.73's but i plan on gong to 4.30's when i get the chance.
also towed my mustang with it without an major problems.
only mods i have done are the exhaust and k&n intake.
i have the 2v not the 3v...
also towed my mustang with it without an major problems.
only mods i have done are the exhaust and k&n intake.
i have the 2v not the 3v...
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New User
Joined: Jun 2005
Posts: 9
Likes: 0
i have 39.5's and an 8"lift i know thats my problem but an exaust system and intake is a bunch of money and from what i understand it wont help that much i need to change to 4.somthing instead of 3.73's but have to do one thing at a time $$$$$$$
Freshman User
Joined: Feb 2005
Posts: 47
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From: Washington MO
5.4 liter V8 was not meant to turn 40 inch tires. Thats pretty much all there is to it, those add-ons wont make a noticable difference. 5.4s kind of a dog on steep grades unloaded, i cant even imagine how your trucks shifts are with 40s and 3.73s Its a beaut for show, dont get me wrong, but you arent going to find a magical power cure
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New User
Joined: Jun 2005
Posts: 9
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thats what i hear but i just drive it on the road and only on weekends i'm just looking to help it out in the best way possible without going broke thanks for the help . i think i should have got 6.0 but i dont like other aspects of that
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Posting Guru
Joined: Nov 2003
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From: Allen, Tx
I now have 33" tires and 4.30 ratio, which made a huge difference in power and just a small dent in fuel economy. I used to have 33's and 3.73 and it was unsufferable, I can only imagine what 40's and 3.73 did to your truck!!! 3.73 and the stock 31.6" tires is passable, but barely. You need 4.10's and stock tires with the 5.4L to get good performance. With 40" tires, you'll need 5.13's at the least, but 5.38's to be good again, meaning at the same overall ratio as the stock tires and 4.10's. Luckily, you can get both of the 5.13 and 5.38 ratios for the Dana 60 front and the Ford/Visteon 10.5" rear. You'd probably do good to get rid of the 2-pinion rear carrier too while you're at it and get an aftermarket locker or limited slip with a stronger 4-pinion carrier design. Of course with all the rotating mass of 40's and its bigger wheels, your mileage will still suck but power will be much improved.
Last edited by n578md; Oct 5, 2005 at 10:19 PM.
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Postmaster
Joined: Jan 2005
Posts: 2,753
Likes: 3
From: Phenix City, AL
I'm not gonna get into another one of my gear posts, as I hav about 20 that explains exactly where you need to go with this.
40" tires, you NEED between 4.88 and 5.38 gears to be even remotely in the correct power range.
Right now you are running a 2.94 effective gear ratio, in a 7000lb+ truck that is as aerodynamic as a brick.
Do a search for gear ratio calculator's and you'll see where this comes from.
Edit: Okay, I changed my sig and put a link to my little calculator. Feel free to use as needed or share as you like.
40" tires, you NEED between 4.88 and 5.38 gears to be even remotely in the correct power range.
Right now you are running a 2.94 effective gear ratio, in a 7000lb+ truck that is as aerodynamic as a brick.
Do a search for gear ratio calculator's and you'll see where this comes from.
Edit: Okay, I changed my sig and put a link to my little calculator. Feel free to use as needed or share as you like.
Last edited by BFR250SD; Oct 5, 2005 at 10:46 PM.
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