What ratio is my differential?
What ratio is my differential?
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.
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.
How do I know what gear ratio I have?
Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio. Note: you may need to round off the number.
How do you calculate rear gear ratio?
The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.
Does VIN number tell gear ratio?
The gear ratio is usually listed in the VIN code located on driver’s door, the glove box, or the ID plate on the dashboard. Count the times a rear wheel goes around for one driveshaft turn: if its 3 1/2 it’s a 3.50:1. Divide the number of teeth on the ring gear by the number of teeth on the pinion gear.
What is differential gear ratio?
Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel. Changing tire size affects the final drive ratio.
What are 3.55 gears good for?
With a 3.55 being a higher numerical number, Garrison says it will put more torque to the tire, allowing for faster acceleration and better performance on hill climbs.
What is the best gear ratio for torque?
A 4.30 ratio will give you better low end acceleration but also lower gas mileage. A 3.73 ratio will still provide decent acceleration but will also provide a tad better mileage plus give you a higher top end speed.
What gear ratio is a Dana 30?
The R&P ratio ranges supported by the carriers are 2.72-3.54 and 3.73-5.38 for the standard rotation and 2.73-3.54 and 3.73-4.56 for reverse rotation.
How do I determine my axle ratio?
Method 1: Count the number of teeth on the ring gear and the pinion. Divide the number of the ring gear’s teeth by the number of the pinion’s teeth. This will give you the axle ratio.
Can you get axle ratio from VIN number?
The Gear Ratio Could Be In Your VIN Code Or Identification Plate. Every number and letter within a VIN reveals information about the automobile, such as the make, model, year built and the engine size.
What was the STD DIFF for the BF Falcon?
Sitting here beside I have the original press kit for the BF Falcon. i reckon there would be a performance gain given the std diff ratio for the 4-speed auto was 3.23 while the 6-speed only got a 2.73. I reckon it would be a tyre fryer in low gears
Do you need to change the diff ratio on an inline 6?
PLEASE NOTE : Changing the Diff Ratio on Models fitted with the intergrated PCM for Automatic Transmission (I.E. EF/EL/AU Inline 6’s) will also need to change their respective EEC-V Module, as changing the Speedo Gear Sender will change the Auto Shift Points !
What happens when you change the diff ratio?
When changing Diff Ratios, it is important to remember that Increasing a Diff Ratio will improve vehicle Acceleration, but will decrease Top Speed, and in some instances fuel economy. This is due to the fact that the engine is reving higher for a given speed.
What’s the difference between diff ratio and Speedo?
By clicking on Calculate, we would notice that there is a 1.33% Difference in the tyres, meaning that there would be a -1.31% difference in speedo Error. When changing Diff Ratios, it is important to remember that Increasing a Diff Ratio will improve vehicle Acceleration, but will decrease Top Speed, and in some instances fuel economy.
