thinking about re-gearing?
Captain
Joined: Jun 2013
Posts: 728
Likes: 1
From: New Port Richey, Florida
4.56 and 35's puts you right in the neighborhood of stock RPM/Speed.
Our trucks seem to start out right around 16-1700 RPM, and it pretty good up to around 4K or so. (but, you don't wanna cruise at 4K) I am thinkin' if you keep your RPM right around 2000 at your typical cruising speed, that would probably be right where ya wanna be.
At 55, I am right around 1500 RPM in O/D, and that is just too low so far as I am concerned.... I am looking at doing 4.56, and 33" tires.... which will bump RPM about 200 or so at my typical cruising speeds. I don't do a lot of freeway driving, so, that aspect doesn't really bother me. (currently, at 70 MPH, I am right about 2200 RPM. I think.)
I have 265/75/16s and 3.55s at the moment.
Our trucks seem to start out right around 16-1700 RPM, and it pretty good up to around 4K or so. (but, you don't wanna cruise at 4K) I am thinkin' if you keep your RPM right around 2000 at your typical cruising speed, that would probably be right where ya wanna be.
At 55, I am right around 1500 RPM in O/D, and that is just too low so far as I am concerned.... I am looking at doing 4.56, and 33" tires.... which will bump RPM about 200 or so at my typical cruising speeds. I don't do a lot of freeway driving, so, that aspect doesn't really bother me. (currently, at 70 MPH, I am right about 2200 RPM. I think.)
I have 265/75/16s and 3.55s at the moment.
Administrator
Joined: Apr 2010
Posts: 87,397
Likes: 4,213
From: Clayton MI
Your gas mileage drops off that bad with speed though? Last major road trip in my truck, (mixture of city/hwy/stopandgo....) I averaged 15MPG for the trip. Bigger tires, and higher rpm probably explains it.... (and seems perfectly reasonable on reflection.
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