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4.56 gear ratio?

3K views 20 replies 12 participants last post by  05' Ditry Duramax 
#1 ·
Ive been seeing a couple guys puttin in some weird gear ratios like 4.56 or somethin. What does this do and doesnt it hurt your gas mileage with a ratio like that?
 
#2 ·
Not when your running 40" tires, it helps you fuel miliage
 
#3 ·
Oh so if your runnin 37's would switchin the ratio to 4.56 help?
 
#5 ·
The consent seems for 35"to 37"Tires go with 4:10 or 4:11
40" you could go 4:56 or 4:63 or 4:88 depending if you tow or not.
 
#6 ·
i did 4.56 with 37's and i am right about were i was for stock
 
#7 ·
The consent seems for 35"to 37"Tires go with 4:10 or 4:11
40" you could go 4:56
Theses tire/ratio combos seem to work well with the duramax, with a truck with less power and higher rev's you could increase the ratio, I seen 1/2 ton gassers with 37"tires running 4:88 ratio gears
 
#9 ·
On my 01 Z71 with 37s I ran 4.88s and it was about perfect but that is also a 1/2 ton.
 
#11 ·
Usually different for gassers and 1/2 tons too, since they have less power and higher RPM
 
#12 ·
How do you change the ratio without spending alot of money?
 
#14 ·
#15 ·
im running 37's with the stock 3.73's. On the freeway doing 60 im at 1500 rpm. Where would 4.56's put me?
 
#16 ·
runnin 37's with 4.56, and it is GREAT!!!
 
#17 · (Edited)
at 70 i am running right at 2100 but my tires measure out to only 35.25 on the truck wish i would of had the money to get some real 37's like my coopers i will not go with BFG again i gave them another chance and this will be the last set i ever buy. the RPMs that i am running are great for towing i can get up to speed easy
 
#18 ·
Who do you all recommend to buy a set of gears from.
 
#21 ·
When you change you ratio to lower like 4:56's, the motor doesn't have to work near as hard to turn bigger tires and you don't need to bury your foot in it to get on the highway. So, to truly get the fuel milage back you have lost with a bigger tire, you must put gears in the truck. It cost a lot of $$$ but worth every penny.
 
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