- Security first! Place heavy duty jack stands on either side of the rear axle housing, elevate the back of the car using a hydraulic floor jack, and chock the front tires to prevent the car from slipping off the jack stands. Onto the jack stands, lower the automobile.
- To take up the slack in the drivetrain, rotate the driver-side tire a quarter turn in the opposite direction.
- Make a mark on the tire and a 6″ line along the driveshaft that can be seen clearly from the side of the car with a piece of chalk or masking tape. It’s best to set this mark in an area that is simple to align, such as the border of the wheel well or the hour mark.
- Count the rotations of the driveshaft as you rotate the tire counterclockwise until it has turned one full revolution. If you can’t spin the tire and see the driveshaft at the same time, you might need a helper. Be as precise as you can.
- You can choose your rear axle ratio using the amount of driveshaft revolutions. For instance, if it rotated three and a half times, the ratio would be 3.50:1. It would be a 4.25:1 ratio if it rotated four and a quarter times.
- Before lowering your car back to the ground, remove the tape/marks from the driveshaft and tire, lift the rear tires once more, and take the jack stands off. The front tires’ chocks should be taken off.
In This Article...
How to Measure Gear Ratio Without Removing Cover
Even though you may believe you are familiar with your Jeep’s gear ratios based on its year and/or differential type, if you bought the car used, it’s possible that someone has already changed them. So, checking the tag fastened to the differential cover by the cover bolts will quickly reveal your real gear ratio. Any figure like 3.54 or 3.73, which may be found on the tag, will tell you what the stock axle ratio is. You can jack up the back axle and support it using jack stands to confirm or check to see if that ratio has changed. Rotate the back driveshaft manually with the transmission in neutral. Calculate how many rotations of the driveshaft it takes for one tire rotation.
The driveshaft has a 3.54 ratio, for example, if it revolves around 3-1/2 times. While performing this test, it can be useful to mark a reference point on the tire and driveshaft with chalk or a grease pencil.
Are gear ratios searchable by Vin?
To choose the transmission gear set that is ideal for your truck, it is essential to know your gear ratio. For your speedometer to read effectively, it’s crucial to know the ratio and tire size in addition to the gear you need.
Here are three methods for determining your truck’s gear ratio:
- The VIN code, which can be found on the driver’s door, in the glove box, or on the ID plate on the dashboard, typically contains the gear ratio.
- Determine the number of times a rear wheel rotates in one driveshaft turn. If it is 3 1/2, the ratio is 3.50:1.
- Subtract the ring gear’s tooth count from the pinion gear’s tooth count.
Are you curious about the gear ratio on your truck? Let’s take a closer look at how to find out and the significance of it.
How is the gear ratio determined?
Calculating the gear ratio involves either dividing the output speed by the input speed (i= Ws/ We) or the driving gear’s number of teeth by the driven gear’s number of teeth (i= Ze/ Zs).
What is my axle ratio in Vin RAM?
You can always check the differential’s tag. The ratio is written on it. You can also obtain your build sheet, which is unique to your vehicle and contains a list of all the parts that went into its construction. Just enter your VIN into that link.
Differential gear ratio: what is it?
The number of rotations the drive shaft (or pinion) will undergo for each wheel turn is determined by the differential gear ratio (or ring gear). A drive shaft turns 3.73 times for every wheel rotation if your gear ratio is 3.73:1.
The final drive ratio changes as tire size changes. The final drive ratio is altered by approximately 17% when going from a 30″ tire to a 35″ tire. This could cause the engine to operate outside of its “power band,” resulting in subpar efficiency and performance. You must adjust the gear ratio to account for the change in tire size in order to restore performance. If your original gear ratio was 3.07, you’ll need a ratio that’s roughly 17% lower, like 3.55. A 4.10 or lower ratio would be preferable if you wish to improve off-road performance.
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With several gears, how do you compute the gear ratio?
If you comprehend the idea of a circle’s perimeter, understanding the idea of a gear ratio is simple. You should be aware that a circle’s circumference is equal to its diameter times Pi (Pi is equal to 3.14159…). As a result, if you have a circle or gear with a 1 inch diameter, its circumference is 3.14159 inches.
Consider rolling a circle with a diameter of 0.635 inches (1.27 inches / 2) in the same manner as shown in the illustration. You’ll observe that it takes two full rotations to cover the same 4-inch line because its diameter is half that of the circle in the illustration. This explains why a 2:1 gear ratio exists between two gears, each of which is half as massive as the other. To go the same distance as the larger gear traveling once, the smaller gear must spin twice.
The majority of real-world gears contain teeth. Three benefits of teeth include:
- They keep the gears from slipping. As a result, gear-connected axles are always perfectly synced with one another.
- They allow for the precise determination of gear ratios. Simply divide by the total number of teeth in the two gears. As a result, when two gears are coupled together, the gear ratio is 3:1 if one gear has 60 teeth and the other 20.
- They allow minor flaws in the actual diameter and circumference of two gears to be ignored. Even if the diameters are slightly incorrect, the number of teeth determines the gear ratio.
What is a gear ratio of 5 to 1?
As an illustration, if a motor drives a 12T gear to a 60T gear that is driven on an arm, the 12T driving gear must turn five times in order for the 60T driven gear to turn just once. It’s called a 5:1 ratio. Although the speed output is just one-fifth as much as the torque production,
What happens if the gearing ratio is adverse?
- A type of financial leverage known as “negative gearing” is frequently used in real estate investing.
- An asset that currently does not generate enough income to pay its cost is said to be negatively geared.
- An investor that engages in negative gearing anticipates short-term tax benefits and ultimate sale of the asset at a higher price to offset initial losses.
- Negative gearing is only a worthwhile endeavor after the property has been sold.
How does speed depend on the gear ratio?
The key to finding the proper gearing is to “compromise.” Higher (shorter) gear ratios offer faster acceleration whereas lower (taller) gear ratios offer higher top speeds. In addition to the gears in the transmission, the rear differential also has a gear. The final drive, differential gear, Crown Wheel Pinion (CWP), or ring and pinion are all names for this component.
The top speed in each gear for various final drive ratios is shown in the table below. Click to learn more about the vehicle’s specifications, including its top speed and gear ratios.
You can observe the difference between the acceleration torque’s increase (28,7%) and the peak speed’s decrease (from 203 km/h to 158 km/h). As previously said, compromises are key. Either you give up torque to get more top speed, or top speed to get more torque.
What is an axle ratio of 4.10?
Let’s begin by going over some of the language terms that gear heads frequently use.
- The ratio of the ring and pinion gears in the rear axle is known as the gear ratio. In other words, for every 4.10 spins of the driveshaft, the rear wheel will rotate once if you have a 4.10:1 (occasionally 4.10) rear axle, as the pinion will revolve 4.10 times for every single turn of the ring gear. Here, we’ll go through how to figure out your current gear ratio.
- Short Gear Sets: The shorter the gears, the higher the number (4.30, 4.11, 4.56, etc.). Short ratios are more efficient and accelerate more quickly, but they aren’t very suitable for highway driving because the engine needs to run at a relatively high RPM to maintain the higher speeds. For rapid acceleration and short drag strips, small gears are ideal.
- Tall Gear Sets: The taller the gears, the lower the number (3.25, 3.00, 2.90, etc.). These gears work well at highway speeds but not well when starting from a complete stop. For longer drag strips and achieving high speeds, tall gears are designed.
- The diameter of the tire is shown by tire height. A tire that is 21″ tall has a circumference of roughly 66″. (21″ x p). This implies that the vehicle travels around 66 miles for each revolution of the tire. For a given drivetrain rotation, taller tires cover longer distances.
- The driveshaft receives the engine’s rotation through the transmission. The first gear on the TKO 500 has a 3.27 ratio. This indicates that the driveshaft is rotated once by the transmission and 3.27 times by the engine. Your car’s engine may be turning at 3000 RPM in first gear, but due to the loss of rotation, the speed is only about 13.98 MPH. The overdrive gear on the TKO, however, is.68. When the engine is running at 3000 RPM and the transmission is engaged, the vehicle will reach a speed of 67.23 MPH. In these equations, a 4.10 axle and a 21″ tire are assumed. The RPM load the engine must supply to the rear axle can be reduced with an overdrive transmission, allowing you to run a shorter rear axle without reducing your top speed.
Is 5.2:1 a decent gear ratio?
For fishing hard-pulling baits like deep crankbaits, large swimbaits, and deep water spinnerbaits, low gear ratios like 5.2:1 and 5.3:1 are ideal. When fishing moving baits in deep water, the low gear ratio enables you to reel the bait slower and keep it longer in the strike zone. These reels offer the most torque, which lets you focus more of your efforts on finding the fish and less on retrieving the bait.
A mid-range gear ratio works well for many different presentations and styles. They are a wise decision all around. While maintaining good performance, you can utilize any fishing approach with a variety of bait, including shallow spinnerbaits, shallow castable umbrella rigs, shallow spinnerbaits, and squarebill crankbaits.
For approaches where picking up slack and returning a bait to the boat are essential, high gear ratios are preferable. A high-speed reel should be used with topwaters, jerkbaits, jigs, plastics, and even lipless crankbaits. These methods leave a lot of line slack, and if you are bit 25 yards from the boat, a high gear ratio helps you achieve a good hookset.