If I don't have my window sticker how would I tell what gear ratio my truck has? 2011 Crew Sport 4x4.

Thanks

 

Depends on how many rpms you are running going down the road. With 3.55 gears you will be running just under 1500 rpms at 60 mph and about 1750 rpms at 70 mph. If you have 3.92 gears then at 60 mph you will be running around 1650 rpms and at 70 mph you will be running around 1950 rpms. And if you are much lower than 1450 rpms at 60 mph and 1750 rpms at 70 mph then you have the 3.21 ratio

 

The easiest way is to call your dealer with your vin# at hand and ask them. Or you can check yourself by jacking up your truck and rotating the tires a precise 360 degrees (one revolution and mark the spot). At the same time, watch your driveshaft from the side and count the precise number of it's revolutions (mark the spot if you have too). A 3.23 will turn the ds 3 and 1/4 of a turn. A 3.55 will turn the ds 3 and a 1/2 turns. A 3.92 will turn it a 1/10 shy of 4 complete turns, a 4.10 will turn 4 a 1/10 turns...kapeech? EDIT: Sorry jayman, you are correct as well and pretty accurate at that. Your post wasn't there as I was typing this and I would say yours is the simplest way.

 

Actually, one of the simplest ways is to ask the dealer for a build sheet for your truck. It will print out everything that went in to making your truck including the gears.

 

You can check the rear axle on the passenger side for a sticker. Here is a pic of mine showing 3.92 gears.

 

Easiest way is just look under the truck. As mentioned, rear axle has a sticker on passenger side as well as the front diff cover on a 4x4. Mine has both.

 

Stopped at dealer this AM and they gave me a print out, turned out to be 3.55

Thanks,

SP

 

I was looking at a 2011 at the dealer the other day and the window sticker did not say the ratio on it. All it it just showed the anti-spin option. It was a single cab shortbed. Ram Express I think.