Originally Posted by Scott H
I have the 8 speed 3.55 and love it but 2014s only come in 3.21 or 3.92.
I tow a fishing boar in the summer but nothing heavy. I drive 90% city 10% highway with a 250 lb topper and about 300 lbs of gear daily.
The 3.55 seems like a perfect balance and I can't decide if the 3.21 will seem gutless by comparison or if the 3.92 will get lousy gas mileage.
If you had to face the same decision but with the six speed transmission what would you select? The eight speed with 3.21 has more off the line ability than the six speed with 3.92s.
As far as MPG I never had a change to figure that out but the math says this: At 1500 RPM, the 3.92s will move the truck along at about 56 MPH compared to almost 69 MPH with the 3.21 rear axle.
The weight you carry and tow is minimal but the type of driving you do really dictates your resulting MPG. In stop and go traffic, the rear axle ratio will have little impact on average MPG but will have a greater impact if your highway travels increase.
Since your travels are 90% city, go for the 3.92s, you will get a significant from dead stop launch will little impact on you average MPG. If you think your highway driving may change, go with the 3.21s.
I have the eight speed with 3.21s and tow up to 7700 pounds on occasion, it doesn't have an issue towing. Most of my driving is "non-stop and go" at speeds averaging 50 MPH and my average MPG is 21.7.