4.56 gear advice
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Junior User
Joined: Mar 2005
Posts: 78
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From: southern california
4.56 gear advice
Thanks to all who gave me the advice on changing my 3.73 gears to 4.56 . I just made the change . With my 315/75/16 tires this really brought back life to my truck . I did a lift and the taller tires when my 2002 was weeks old so i didn't realize how much power my bigger tires ate up . I'm still taking it easy with the new gear break in, but i can really tell a difference just taking off from a stop.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Originally Posted by JKBrad
Don't surprised if your fuel milage actually increases.
My '96 t-bird 4.6L had a 3.27 rear in it stock. I put in a 3.73 - it went from 10-11MPG stop and go to 15, and on the highway went from 24 to 26.
New User
Joined: Sep 2005
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How is the mileage with your new gears. I have 315s on my truck and I'm seriously thinking about going with 4.56s. Is it worth the money? If it hurts my gas mileage more than .5 mpg I don't think I could stand the dent in my pocket book.
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Cargo Master
Joined: Oct 2004
Posts: 2,148
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From: Seneca, SC
well the mileage might be the same at the motor standpoint, but with a lift, you're increasing the profile of your truck in aerodynamics. Therefore any lift will hurt you in the highway mileage.
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Junior User
Joined: May 2005
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From: Seal Beach, CA
Originally Posted by jcissell
you guys with 4.56s what mileage do you get?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
6overZilla, except for the bigger aerodynamic profile of the tires, you shouldn't see any different MPG than us "little" guys running stock tires.
As long as your RPM vs speed doesn't change, the overall gearing (and resulting MPG) doesn't change.
I wonder how much the under-carriage air flow affects things... Anyone making an air-dam for my Dana 50 front-end?
As long as your RPM vs speed doesn't change, the overall gearing (and resulting MPG) doesn't change.
I wonder how much the under-carriage air flow affects things... Anyone making an air-dam for my Dana 50 front-end?
Logistics Pro
Joined: Jan 2002
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I want 4.88:1s twisting 29" tall by 18" wide and a top rpm to 8000... OH well, guess I will stick to drag racing my Kawa 900 KZ1 (soon getting my hands back on a H2 750 tripple)
Think when I build up the 2v V10 T-Bucket I will go with the 4.88:1 just for the occasional fire breathing wheel stand! (yes virginia, I know I will need a BEEFY front end)
Think when I build up the 2v V10 T-Bucket I will go with the 4.88:1 just for the occasional fire breathing wheel stand! (yes virginia, I know I will need a BEEFY front end)