RPM at 70

[Vasbinder]

What is the normal stock RPM for a 03 Duramax at 70? My truck has 305 on it and it reads 2000 RPM. Just wondering if it has stock gear ratio

 

[03 D-max]

that sounds about right to me

 

[LT1BRD]

mines about 1900...just a hair under 2000

285's

 

[Redbowties88]

yea thats right on the money...i ran 305's for a while

 

[paint94979]

mine is at 2200 don't make the mistake of going with short tires

 

[jonathancasey19]

305/55/20's i see 1900

 

[Brian1]

Yep around 2000 like mentioned. Check this post to see what each gear and tire sizes.
http://www.grimmjeeper.com/gears.html

Brian

 

[wikdlmm]

mines 1800 but i have a 6 speed

 

[Vasbinder]

So what is the stock gear ratio

 

[LT1BRD]

3.73

 

[JMDuramaxLB7]

My truck with 305/65/17s is 2050 at 75. and about 1900 at 70.

 

[TheBac]

About 2200 with the 245's, 2000 with the 285's