3.73 Gears to 3.54... Worth the effort?? - Ford Powerstroke Diesel Forum
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Old 03-26-2011, 09:00 PM
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3.73 Gears to 3.54... Worth the effort??

I have an 01 F250 PS 4x4 with the stock 3.73 axle gears. Tires are also stock 265/75R16 and the truck has no mods at this time. I would like to go to taller gears, 3.54 perhaps. Pull a little with it, not much and very rarely over 10,000 lb gross on trailer. Is this a viable option to pursue or am i just ? Does anyone else have any better ideas to lower engine rpms besides using taller tires? Really do not want to go to the 285/75R16 tires. Any and all input is welcomed.
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Old 03-27-2011, 06:46 AM
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The simplest and least expensive way is to slow down.

If you're just after economy, regearing two axles would cost more than the minute amount of fuel you would save over the next 100,000 miles.
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Old 03-27-2011, 06:58 AM
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its really not that hard to re-gear..but honestly you usually only do it when you lift and huge *** tires.. take your foot outta the skinny..mpg goes up.. or get some tow tunes..
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Old 03-27-2011, 07:01 AM
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When going with taller gears or tires you put more strain on the engine and drive train!
*transmission*!!
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Old 03-27-2011, 07:10 AM
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Quote:
Originally Posted by POWERSTROKEN1/25 View Post
When going with taller gears or tires you put more strain on the engine and drive train!
*transmission*!!
and so does a tuner, or larger tires..or burnouts..anything you do will...im pretty sure you can get 3.55 from factory can you not?
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Old 03-27-2011, 07:34 AM
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Not worth the effort/time/money, IMHO.
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Old 03-27-2011, 07:43 AM
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Quote:
Originally Posted by JSchuricht View Post
The simplest and least expensive way is to slow down.

If you're just after economy, regearing two axles would cost more than the minute amount of fuel you would save over the next 100,000 miles.
Doesn't slowing down take all the fun out of driving?...

The first thing I would do instead of regearing, would be a good intake and exhaust, these help with the overall efficiency of the motor, and I've seen an upwards of 3 mpg better on average.
Not to mention you'll notice how it doesn't feel like you're pushing your truck down the road with the gas pedal, unlike a stock truck where your foot is always buried in the floor board.

Next thing would probably be some good tunes, my dad drives his CCLB at 65mph, with intake and exhaust, and gets around 24-25mpg on a good day, I have friend that drives his CCLB with topper(stock otherwise) @ 70-72mph with a canned superchips tow tune and he's getting 24mpg... so a good tune does wonders.

If after that you're still feeling the pump bite you in the but, and knowing that the average F150 only gets 15mpg for something half the size of your own, the next step would be a 2 speed overdrive from GV, which adds a second overdrive gear of .60, over the standard .72, but keeping the lower ratio's for towing...
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Old 03-27-2011, 07:54 AM
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Originally Posted by 03_Turbo7.3 View Post
and so does a tuner, or larger tires..or burnouts..anything you do will...im pretty sure you can get 3.55 from factory can you not?
In the new 6.7's, 3.55's are standard, and 3.73's are in duallies...
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Old 03-27-2011, 08:00 AM
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i love how you still have my quote..made me laugh..stupid F650 conversion..idiot
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Old 03-27-2011, 08:33 AM
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I read that thread and was like WT* ... You totally made my week!

Haven't found another that's come close to replace it.
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