How do I work out what diff ratio I need?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

How do you calculate transmission gear ratio?

The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).

How do you calculate final drive ratio?

By simply dividing the ring gear tooth count by the pinion gear tooth count, the ratio is determined. For example, if we divide a ring gear with 41 teeth by a pinion gear with 10 teeth we find that the gear ratio is 4.10:1 (41/10 = 4.10). Tire diameter will also have an effect on a vehicle’s final drive ratio.

How do you calculate speed with rpm and gear ratio?

Engine RPM divided by total gear ratio, multiplied by the tire diameter and converted for units of measurement, gives vehicle’s speed of travel.

What is a good gear ratio for highway driving?

For on-highway linehaul, the range tightens to a fuel friendly 2.26 through 3.42 for the most common ratios. “For on-highway, direct drive, it starts all the way down at 2.26 and up to 3.08 or larger,” Garrison says. “Getting into the mid- and upper-threes is starting to get more unusual these days.”

How do I know what gear ratio my front differential is?

Divide the number of driveshaft turns you counted by 10 (same for both LSD/Locker and open). That’s your gear ratio.

What’s the difference between 4.10 and 3.73 gears?

4.10s are going to accelerate faster and decelerate faster on lift. However the trade off is greater fuel consumption per mile driven and higher engine speed per given road speed. In basic terms the 4.10s will feel quicker and 3.73 will feel faster.

Are 3.73 gears good for highway?

Well, if you plan on doing a lot of freeway driving, you don’t want to choose a gear that’s too low for your car because you’ll be going down the freeway at too high of an RPM. Shorter gears (higher numbers) are much better suited for accelerating, such as 3.55, 3.73, 3.91’s, 4.11’s etc.

Does higher gear ratio mean faster?

A lower (taller) gear ratio provides a higher top speed, and a higher (shorter) gear ratio provides faster acceleration. . Besides the gears in the transmission, there is also a gear in the rear differential. This is known as the final drive, differential gear, Crown Wheel Pinion (CWP) or ring and pinion.

What gear ratio is best for speed?

In the real world, typical street machines with aspirations for good dragstrip performance generally run quickest with 4.10:1 gears. Lower gears are required if the car is very heavy, or if the engine makes its power at the upper end of the rpm scale.

What is the formula for calculating rpm?

How to Calculate Motor RPM. To calculate RPM for an AC induction motor, you multiply the frequency in Hertz (Hz) by 60 — for the number of seconds in a minute — by two for the negative and positive pulses in a cycle. You then divide by the number of poles the motor has: (Hz x 60 x 2) / number of poles = no-load RPM.

Are 3.73 or 4.10 gears better?

Is there a calculator that calculates the transmission ratio?

This calculator will provide the speed of the vehicle based on transmission gear ratio, engine RPM, tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. This calculator assumes you know the vehicle’s transmission ratio.

What do you need to know about 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 the differential and transmission angle the same?

Please note that the transmission and the differential are parallel, the rules of geometry guarantee that the two operating angles will also be equal + or – 1 degree.

Is there a gear ratio calculator on Tremec?

As an added bonus, the Gear Ratio Calculator doubles as a Vehicle Speed Calculator. The estimated speed you will be traveling based on the parameters you established and the transmission you selected. TREMEC ASPECT RATIO CALCULATOR: Find your tire height using this calculator.