truck rear end ratios
If one truck has an axle ratio of 331 and another has a ratio of 355 the former will burn less fuel. If you are looking at a modern truck dated 2010 or later you will likely want an axle ratio of 355 to 373 for towing purposes.
Differential Gear Ratio Chart Tire Size To Gear Ratio Tyre Size Car Mechanic Automotive Mechanic
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. Count the times a rear wheel goes around for one driveshaft turn. The proper rear-end gear ratio can be selected using the following simple formulas whether using a direct-drive 1to1 or overdrive usually 30 transmission. Axle Positraction Limited Slip.
Our Tribe The Trucking Tribe is a group of people with a mission to do the hard work continue their education improve their health and well-being and achieve success in their. Find a Spicer parts distributor today or find where you can place your order now on Danas. When you multiply the two ratios it equals the final drive ratio.
When shopping for a truck with good fuel economy regard the axle ratio as the amount of fuel the truck burns while operating at highway speeds for any amount of time. Our Mission The driving force of our success is understanding the evolving needs of todays owner-operators and drivers. According to Slesinski Class 8 linehaul trucks that spend most of their time at highway cruising speeds usually fall into axle ratio ranges usually between 226 through 3361 based on duty-cycle speed and type of transmission.
Axle Ratio RPM X Tire Size Speed MPH. In any case the axle ratio matters. The axle ratio also sometimes called the gear ratio is determined by the gears in your trucks differential.
Our mission is to provide innovative solutions for the challenges they face. In either case it essentially means the drive shaft and pinion need to rotate 342 times in order to rotate the axle shafts once. These ratios are determined by the number of teeth on the pinions which impact the number of turns the axle makes.
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. If you have installed larger tires they rob performance and you would want to go to a lower ratio like a 456 or 488 depending upon your tire diameter. The gear ratio is usually listed in the VIN code located on drivers door the glove box or the ID plate on the dashboard.
This is especially true of a vehicle equipped with a V-6 or small V-8. Usually the Detroits like it around 1400-1550 or so is a good range. A truck equipped with a lower axle ratio will do just that.
What is a Rear End Gear 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. Most automobiles use gear ratios in the drive axle and the transmission to multiply power.
Here are three ways to find the gear ratio of your truck. A semi truck using a gear ratio of 226 would have good fuel economy and sufficient power for small tasks however it would lack a great deal of. If you have a 342 rear end ratio and need more towing power you would switch to a 410 ratio.
A driveshaft that rotates 2 34 times announces a 276 gear ratio. This is the ideal axle ratio range if you need acceleration and power from your V8 or diesel motor. 8 DETROIT LOCKER.
It also produces an effect on the torque and towing capacity result in better fuel economy. If the driveshaft turned 3 34 revolutions for two rotations of the tire you have a 373 gear. Mostly the gear ratio of pickup trucks of different year models is 410 420 331355 and 390.
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. Axle ratios for heavy-haul applications operating on-highway range from 308 to 4101. Most class 8 semi trucks have a gear ratio of between 226 and 3361.
Both combinations give roughly the same cruise rpms and final drive ratio and the best balance between efficiency and pulling power. Its for those very reasons I always buy a new truck with one of the optional axle ratios typically 373s or 392s when the primary boat being towed is less than 21-foot. Most fleets today opt for either a 355-58 rear end with a 73-74 OD top gear or 264 rear end with a direct drive top gear.
9 DETROIT LOCKER. Call to Order before 4PM PST and most Parts Ship Out TODAY. If its 3 12 its a 3501.
This proportion is known as an axle ratio. West Coast Differentials Tech Support Order Hotline. If you run the east coast mainly then 65 if you run out west allot the 70 or 75 in the sweet spot.
The gear ratio of a truck can either be 32 or 56 depending on the type of vehicle. Axle ratios may be expressed in notation as something along the lines of 3421 or a 342 rear axle. Transmission Ratio RPM Calculator.
8 TRACK LOC. FIGURING TIRE DIAMETER Height FORMULA. When you hear car drivers refer to numbers such as 3081 3731 or even 4101 they discuss the ring-and-pinion gears ratio within the rear axle.
Tire Size 254 x Aspect Ratio x 2 Wheel Diameter Tire Diameter in Inches Height. 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. These are not the only ratios however.
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