Truck Rear End Gear Ratios Explained

By Vi_Amina810 18 May, 2022 Post a Comment

Much has changed over the past 5 years or so with axle ratios. Unfortunately there is no one answer to this question.

Gear Ratio Tire Size Chart Http Www Jeep4x4center Com Jeep Tires Tire Gear Ratio Chart Htm Truck Tyres Jeep Mods Jeep Xj

1800 RPM 65693811 2731.

. 1800 RPM 65693811 2731 x 130 3541. 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. EXAMPLE With Overdrive 30.

So if you install a bigger more powerful engine you probably. 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 best gear ratio for a semi truck to haul a heavy load is 4111.

You have to take into consideration the engine and transmission installed then of course what. 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.

A higher ration number will give you more torque power at the rear wheels better acceleration more low end pulling power but lower top speed and less fuel mileage. However this gear ratio is not good for fuel economy. Many big companies in the US like to use a 10 speed direct transmission 11 in 10th gear with a relatively high rear end ratio of 2641.

This is a good ratio for the occasional towing or hauling individual. Rear end gear ratio is boiled down to lower numerical values giving better acceleration torque top speeds and better fuel economy. Rear-Axle Ratio Spec Guidelines.

The most popular rear-end ratio in trucks today is the 355 which sort of averages towing power and fuel economy. In medium-duty trucks gear ratios range from as low as 2691 to as high as 7171 depending on the. A gear ratio of 3251 is good for long-distance traveling without heavy hauling.

What it all comes down to is speccing the truck appropriately for the application. For a person who tows more often and heavier loads the 373 or 410 may be more appropriate. Answer 1 of 6.

The numbers 355 and 373 refer to Ford truck axle ratios. A higher number means a faster-spinning driveshaft or larger diameter wheels with less tire rotation needed for a given distance. With a 392 ratio the engine will be spinning at a higher rpm and making more torque with respect to a 355 ratio.

The ratio is simply the number of teeth on ring gear divided by the number of teeth on pinion. I recommend 3731or 4101 ratios for those who regularly tow heavy trailersand as I said above 410s for anyone going to larger tires. 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.

For example if the ring gear has 41 teeth and the drive gear has 10 teeth the correct gear ratio would be 4101. Rear end Ratio is the ratio of how many times the drive shaft turns to how many times the axle turns. The driveshaft connects the differential to the transmission and it turns at the same speed as the engine.

You divide the number of teeth on the ring gear by the number on the pinion. Knowing how to calculate the rear end gear ratio to choose the right one is not a must but. The axle ratio tells you the number of revolutions the drive shaft makes compared to the rear axle.

The rear end ratio tells you how many turns of the wheel are needed for one turn of the driveshaft. If we do the math in reverse and divide 87 the new tire size by our FDR number we get a new gear ratio of 574. The gear ratio of the set is 4541.

1941 2159 ratio. Axle Ratio RPM X Tire Size Speed MPH X 336 Example 488. For example a 216 ratio could have 41 teeth on the gear and 19 teeth on the pinion.

A gear ratio of 3551 is considered the best median level for. Source Mike Aguilar. 2000 RPM 65693811 3041.

There is a LOT of sciencetestingetc behind the best transmission gearingrear end gearing to get the best fuel economy. That is what our rear gear should be. The same is said for a 456 ratio.

Engine RPM Cruise Tire Revolutions Per Mile Rear-end Gear Ratio. If one truck has an axle ratio of 331 and another has a ratio of 355 the former will burn less fuel. This is because the first trucks engine has lower revolutions per minute than the second truck.

The axle ratio also sometimes called the gear ratio is determined by the gears in your trucks differential. A smaller engine will need a lower rear end to give adequate acceleration. A more powerful engine can use a higher rear end to give relaxed cruising and a higher top speed.

The ring gear has 50 teeth and the pinion has 11. Low gears give fast acceleration high gears give better cruising. 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.

This is set up by how many teeth are on rear ends ring and pinion gears. FIGURING REAREND GEAR RATIO Ring Pinion FORMULA. In the image below we have 50 teeth on the ring gear and 11 on the pinion so the formula looks like this.

Looking again at the ratios used above the higher 355 ratio indicates faster acceleration whether the trucks empty or loaded. For a 355 axle ratio the drive shaft will turn 355 times for every one revolution of the tire. What the gear ratio can do is modify where the engine rpm is with respect to any given speed.

Differential Gear Ratio Also Known As Final Gear