What do you need to know about axle ratio?
What do you need to know about axle ratio?
If you’re shopping around for a new pickup truck, axle ratio is a critical component to consider before making a purchase. What Is Axle Ratio? Axle ratio is the number of revolutions the output shaft or driveshaft needs to make in order to spin the axle one complete turn.
How to determine the rear axle ratio of a Posi car?
Determining a Rear Axle Ratio of a Non-Posi Rear Jack one wheel off the ground, put the transmission in neutral and take the parking break off. Mark the wheel and the drive shaft with chalk or masking tape. Turn the wheel TWO revolutions and count the number of driveshaft turns.
What is the axle ratio of a JL Wrangler Rubicon?
For instance, the JL Wrangler Rubicon has 4.10 axle ratios in the front and rear, which is different than the 3.45 axle ratios found in the less expensive Sahara and Sport editions. Many off-road enthusiasts choose to upgrade their axle ratios for performance benefits. However, there are some downsides to going larger when it comes to axle ratio.
Where do I find my rear end ratio?
The table below will help you determine what rear end ratio you have by using your RPO code, answering the question: What rear end ratio was in my Chevrolet or GMC vehicle when it left the factory. You can typically find your RPO code on driver side door panel or glove box.
Why is it important to know rear axle ratio?
The rear axle ratio of your car is instrumental in determining which transmission gear set is best suited for your car. It is also important to know the ratio as well as tire size to determine which speedometer gear you need so your speedometer reads accurately. By following these directions, you can determine what the axle ratio is in your car.
Which is better 3.73 or 3.21 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.
What is the RPO code for a rear axle?
GM RPO Axle Code List (H) RPO Axle Type Ratio H01 Rear Axle 3.07 H04 Rear Axle 4.11 H05 Rear Axle 3.73 H12 Rear Axle (Eaton 21065S) —
Determining a Rear Axle Ratio of a Non-Posi Rear Jack one wheel off the ground, put the transmission in neutral and take the parking break off. Mark the wheel and the drive shaft with chalk or masking tape. Turn the wheel TWO revolutions and count the number of driveshaft turns.
