clutch1

2250 at 64, now that i think about it its not that bad. cant complain about this setup when im haulin

jazz_kt

I run 2100 @70mph with an auto and 4:10's. That is a nice sweet spot for some quick acceleration if needed. At least to play with some duramax's or powerstrokes

clutch1

must be nice, yeah a stomp from 2100 is quick

Box5

I run like 2250 at 70 with my auto and 4.10's

BigBlue

I run 1750 at 70mph in my auto with 3.54's.

03qclb5spd

That may explain it then.

natew05

i run 2 grand at 60 and a little over 2500 at 75 with 4.10s and a 5 spd

Ph4tty

Check that calculator linked above. Tire size is a factor too.

03qclb5spd

My tires are not that much bigger than stock, just 285's....not a whole lot of difference.

Ph4tty

Then you get a bigger tire to drop rpms if you want low revs like that 3rd gen. Double overdrive sounds like a good idea for an auto.

TheBigNasty

Clutch, I don't remember if you have the gsk yet but if you don't, get it. It will help you a lot since you are already turning alot of rpms. Do that first, then see if you want 3.73 or 3.55. I know my 3.55's don't have a problem turning 40's pulling a ski boat at 70.

clutch1

i think im skipping the 3.73s and going with the 3.55s, guess that means a new carrier and all.

Floorman

not sure about the double over drive but it does cruise at alot lower rpm. talked to a guy was claiming 22 mpg towing 11000,lbs . although i have a hard time swallowing 27 with 4:10s i have them and the best i have ever seen is about 20 going 55 . but isnt 30 gallons divided by 400 miles 26mpg?

Box5

yea 27 seems very hard to reach, i'd love to see that milage... best i've got was 22, average 19.

clutch1

27 to 30 in town no mater how i drive, on the highway i get a real bad milage 21,