dirt track racer 81

iTrader: (45)

i run 6.00 gear in my race car and top speed at 7k rpm is 90mph.. so with 4.56s its going to be a lot higher speed

jakebdb56

iTrader: (24)

just my 2 cents:
for a daily driven truck that you want some noticable gain in I would recommend 4.10's

for a full out race truck I would still probably run 4.10's, but a LOT depends on what you're wanting to do and what kind of power you're dealing with

my truck: I went from 3.73's to 4.10's over 6 months ago and I noticed a small loss in gas mileage which is mostly due to me having a 3k stall now. Overall, it was money well spent although I had to spend it since my G80 blew up. When I gotta buy a new diff why not buy gears too huh?

budhayes3

iTrader: (19)

Some guys say that you won't notice a difference going from 3.73's to 4.10's, but I've driven vehicles that have done that exact swap and can tell the difference for sure. I currently have 3.73's and a 31" tall tire and would love to go to 4.10's if I had the funds. You can still cruise the highway and take your truck on long trips without the engine screaming and still retain some fuel economy with the converter locked in overdrive, yet have that extra gearing to get you moving off the line. It's a nice all around gear for a truck with "taller" (29+ inches) tires. Just my .02.

02silverado5.3

well i mean i still go on long trips and things so i dont want it screamin the whole way but im 20 and in school, once i get the stuff put in im stuck with it haha cuz ill be broke and another thing is i topped out the other day at like almost 140 i dont need that haha so what about inbetween 4:10's and 4:56's? i want a 13 second truck thats why i want the big ones haha but thanks guys

dirt track racer 81

iTrader: (45)

dozerdan has a 3k stall, 4.56, and pretty good size cam and still gets 20mpg. ive still got more tweeking i can do it the tune to get another mpg or 2

jakebdb56

iTrader: (24)

yeah that's in a rcsb... we have the fatter big brother ECSB's lol

budhayes3

iTrader: (19)

4:30's are in between...

dirt track racer 81

iTrader: (45)

yep. i was just stating the lose of gas mileage is not much i think he only turns 2300-50 rpm at 70. i turned 2200 with my 4.10s

jakebdb56

iTrader: (24)

Yeah I turn about 2200'ish now with the 4.10's, and with a tail wind I get 20mpg
Otherwise, it's more in the 17-18 range

BlackGMC

iTrader: (31)

I would not worry about MPG loss until you get a different Torque Converter, then watch your MPG drop BIG TIME! my truck 10-12 city/ 20 highway.....