well i bought a set of 4.10s from rons machine on ebay and they whine like a 747 taking off and the guy that setup my rearend is going to get me a brand new set and was wondering how much of a differance is there from 4.56s over 4.10s as far as on the highway and as far as tire size

 

BlackGMC put a shift point calculator in the Drivetrain section that lets you put in your tire size and gear size ind and it tells you what RPM and speed you are at in each gear.

Since I just bumped from 4.11 to 4.30 i have to say you'll love it. Buy Motive gears.

I also switched to a taller tire so I didn't really gain hardly any rpm at 65

 

thanks didn't know that ill def check that out

 

go with 4.56s...i've had 3.23s, 3.42s, 3.73s, 4.10s and now 4.56s and they're by far my favorite...still getting near 20mpg...i look to achieve that goal with a taller tire and more work on the VE table

 

yeah i think im going to go with 4.56s plus it will help out with my no power down low POS 4.8

 

4.56!!!!!!!!!!!!!!!!!!!!!! u will love it

 

HA even the 5.3's are no power pos'.

 

4:56's dont look back!

 

What does his gear selection have to do with the engines CI?

It's a truck. with 4.56 he'll be able to get off the line better and have more towing abilities and will also allow room for a larger cam with a stall to match.

 

sooo I guess next year 5.13s are going to be the norm? IMO more power less gear.