rpm difference between gearing

[brokesilverado]

Just wondering what the rpm difference is at 70mph. My 3.42 ratio at 70mph is around 1750rpm. How about those with 3.08 or 3.73?

[CAtaylor]

Mine is 2250 with 4:56.

[thetruck454]

http://www.grimmjeeper.com/gears.html

 

Here is what I always use for trying to figure out gearing

[bboyce536]

Usually it's about a 200 rpm difference between the ratios. My 2011 with 3.73 was just under 2k at 70 and my 14 with 3.42 is like you said just under 1800.

[Fasthotrod]

brokesilverado, on 09 Oct 2014 - 3:51 PM, said:

 

Just wondering what the rpm difference is at 70mph. My 3.42 ratio at 70mph is around 1750rpm. How about those with 3.08 or 3.73?

1750 / 3.42 = 511.7

 

511.7 * 3.08 = 1576 rpm.

 

511.7 * 3.73 = 1909 rpm.

 

(Assuming the same size tires and transmission gear you're running down the highway.)

[brokesilverado]

1750 / 3.42 = 511.7

 

511.7 * 3.08 = 1576 rpm.

 

511.7 * 3.73 = 1909 rpm.

 

(Assuming the same size tires and transmission gear you're running down the highway.)

Never thought of that great math skills thanks!