Truck Rear End Gear Ratio Explained

By Kur_98Lillian 19 May, 2022 Post a Comment

This component is located at the rear end of a rear-wheel-drive truck and it links the back axle to the driveshaft turning a parallel rotation into a perpendicular one. A high numerical gear ratio is called a low gear or low rear end and vice versa.

Semi Truck Axle Ratio Overview Truckfreighter Com

Engine downspeeding is enabled through faster axle ratios that allow the engine to maintain a lower RPMthus saving fuelwhile still providing the necessary power to the axle.

. However to run in direct gear the rear gears must be either 264 247 221 and I think there is even a higher gear than the 221. The most popular rear-end ratio in trucks today is the 355 which sort of averages towing power and fuel economy. You divide the number of teeth on the ring gear by the number on the pinion.

Divide the number of the ring gears teeth by the number of the pinions teeth. Engine RPM Cruise Tire Revolutions Per Mile Rear-end Gear Ratio. I recommend 3731or 4101 ratios for those who regularly tow heavy trailersand as I said above 410s for anyone going to larger tires.

In medium-duty trucks gear ratios range from as low as 2691 to as high as 7171 depending on the. This chart applies to all Ford non-overdirve transmissions manual and automatic. Rear end gear ratio is boiled down to lower numerical values giving better acceleration torque top speeds and better fuel economy.

Much has changed over the past 5 years or so with axle ratios. For example if the ring gear has 41 teeth and the drive gear has 10 teeth the correct gear ratio would be 4101. The standard axle ratio found in a GMC truck or SUV has been carefully selected according to the vehicles specific body style and engine in order to provide the best all-around mix of performance towing strength and efficiency.

For example if the ring gear has 41 teeth and the drive gear has 10 teeth the correct gear ratio would be 4101. That said if you regularly tow heavy trailers. Low gears give fast acceleration high gears give better cruising.

Notice that if you make an uneducated purchase and decide to go with a 17 tooth clutch bell and a 62 tooth spur gear you end up with the same gear ratio 36 and 36 is stock. This will give you the axle ratio. The gear ratio most interesting to 4x4 truck owners is the ratio between the driveshaft and axles - the differential gear ratio or axle gear ratio.

The rearend gear ratio refers to the relationship between the driven gear ring and the drive gear pinion and is easily calculated by dividing the ring gear tooth count by the drive gear tooth count. The rearend gear ratio refers to the relationship between the driven gear ring and the drive gear pinion and is easily calculated by dividing the ring gear tooth count by the drive gear tooth count. Radio Control gear ratio basics and RC gear ratio chart.

A ratio of 456 means that as the axle turns one whole circle the driveshaft turns 456 circles. 1800 RPM 65693811 2731 x 130 3541. FIGURING REAREND GEAR RATIO Ring Pinion FORMULA.

Axle ratio is written as well a ratio such as 2161 in the case of Detroits fastest direct drive axle ratio offering. HPI Savage X 46 and Savage Flux revealed. So if you install a bigger more powerful engine you probably.

The gear ratio of the set is 4541. If you have a 342 rear end ratio and need more towing power you would switch to a 410 ratio. It is controlled by the number of teeth on the ring vs.

For instance the 3421 ratio included on many Canyon V-6 and Sierra 1500 models offers a good all-around blend. The best ratio is to have your engine run at the sweet spot RPM at the speed you will be running most of the time. The axle ratio also sometimes called the gear ratio is determined by the gears in your trucks differential.

Usually the Detroits like it around 1400-1550 or so is a good range. Axle Ratio RPM X Tire Size Speed MPH X 336 Example 488. Check out the image below.

The king is. If your looking for more power or performance you would switch to a lower ratio. Listed are the expected RPMs at 60 MPH with a given rear end ratio and tire height.

Method 1 requires that you take apart your differential but there many be an easier way. 2000 RPM 65693811 3041. Rear-Axle Ratio Spec Guidelines.

1800 RPM 65693811 2731. Power is transmitted from the transmission to rear end 11 in. Tekno Front.

EXAMPLE With Overdrive 30. RPM - Rear End Ratio Chart. 1 to 1 or direct gear is always the best gear for fuel mileage quietness cooler temperatures in the transmission and more pulling power.

This is a good ratio for the occasional towing or hauling individual. If you run the east coast mainly then 65 if you run out west allot the 70 or 75 in the sweet spot. First locate your current gear ratio and tire diameter and then find your approximate RPM at 65 MPH then reference your new tire diameter with your desired RPM to find the new gear ratio needed.

A more powerful engine can use a higher rear end to give relaxed cruising and a higher top speed. So when you buy your next new truck put a check mark next to the box that lists the optional axle ratio best suited for your driving needs and future upgrades. Its just backwards from the way we think if you have a 410 ratio and need better fuel mileage you would switch to a 342 or 373 gear ratio.

The chart below may be of some help in deciding what rear end ratio is right for you. Count the number of teeth on the ring gear and the pinion. The ring gear has 50 teeth and the pinion has 11.

A smaller engine will need a lower rear end to give adequate acceleration. The first time you wade into the gears universe you will encounter several terms such as gear ratio rear end gear systems or trains etc. The higher the number the lower the ratio becomes.

For a person who tows more often and heavier loads the 373 or 410 may be more appropriate. The average speed today is 70 miles per hour. In the image below we have 50 teeth on the ring gear and 11 on the pinion so the formula looks like this.

Knowing how to calculate the rear end gear ratio to choose the right one is not a must but.

What Is Axle Ratio How To Find Axle Ratio Heavy Truck Information