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Yeahright
04-22-2012, 06:29 AM
Is anybody running 315x70x17 or even a 35 of some type with 4.88 or 5.13 gears on a petrol auto, and what is you RPM at 70 mph.
I know there is a graph which will tell me this , but I want to know (before I buy gears) is what the actual RPMs are at 70mph.

Gump
04-22-2012, 01:48 PM
You can calculate all of that with this:

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

wayoflife
04-22-2012, 04:53 PM
Is anybody running 315x70x17 or even a 35 of some type with 4.88 or 5.13 gears on a petrol auto, and what is you RPM at 70 mph.
I know there is a graph which will tell me this , but I want to know (before I buy gears) is what the actual RPMs are at 70mph.

i've run 35's with 5.13's and at about 70 mph, my rpm's were running at around 3200 rpm. if you want more of a stock performance, 4.88 is the way to go. if you have a 2012, you would be fine running 4.10's.

Yeahright
04-22-2012, 11:54 PM
No worries thanks fellas, I am swaying more towards 4.88s as wayoflife said so I can get back to as close to stock as possible because over here in Australia we do a lot of long distance with little changes in elevation.