How do I choose a diff ratio?

How do I choose a diff ratio?

To find the ideal selection, multiply the final drive ratio by the redline speed in fourth gear (152 mph) and divide that by the top track speed (140 mph). This would yield a theoretical 3.33—which is close enough to the nearest available final drive ratio of 3.36:1.

What is the difference between a 3.21 and 3.73 axle ratio?

A numerically higher axle ratio provides a mechanical advantage to send more of the engine’s available torque to the rear tires (and front tires, in a four-wheel drive vehicle), but you pay the price at the fuel pump. So, a truck with optional 3.73 gears will tow a heavier trailer than one with 3.55 or 3.21.

Is a 3.73 axle ratio good for towing?

A 3.73 ratio is suitable for regular light towing. If you plan on towing a fifth-wheel trailer or anything heavier than 5,000 pounds, you should consider a 4.1 axle ratio.

Is a 3.21 gear ratio good for towing?

5) Speed range that 3.21 is better at towing: 31-38 MPH, 48-57 MPH. 6) Speed range that 3.92 is better at towing: 0-30 MPH, 39-47MPH, 58-70 MPH. 2) 3.21 has “an extra” overdrive gear: The 8th gear in 3.92 is the 7th gear in 3.21, thus effectively mean the 8th gear in the 3.21 is an extra gear to the 3.92.

How do I choose the best differential gear ratio?

In order to select the ideal differential gear ratio, the first thing you will need to know is your actual tire diameter. The simplest method is to measure the height of the tire from the ground to the top of the tire.

Is there still hope for a high differential ratio?

Still, there is always hope. The ideal production differential ratio—those gears found at the car’s drive wheels—for the street is as high as possible for fuel economy, with an increasing number of transmission ratios to get good acceleration from a dead stop.

How do you calculate axle ratio?

Another way to calculate the axle ratio is to count the number of teeth on the ring gear and divide that by the number of teeth on the pinion gear. The resulting number is the ratio. The ring gear is the large circular gear inside the differential case, and the pinion gear is the smaller gear that connects to the driveshaft.

How many possible gear ratio combinations are there in a transmission?

It has eight possible gear ratio combinations. [Richmond Gear] (http://www.richmondgear.com/) also bought the rights to the old Doug Nash five- and six-speed transmissions, which have at least eight ratio possibilities in every gear for an almost unlimited number of combinations.