Use calipers to measure both ring andpinion diameters to a tenth of an inch. Count the teeth on boththe ring gear and pinion. To determine theratio between the gears, divide the number of teeth on thepinion by the number of teeth on thering..
Similarly, you may ask, how do I know my ring gear size?
The ring gear diameter is measured across theface of the gear. To obtain the ring gear diameter,simply place a tape measurer across the gear. This can betricky if the ring gear & carrier are still in thehousing. In some cases, a differential can be identified by thenumber of cover bolts is has.
Furthermore, how does a ring and pinion work? Ring and pinion gears are the automotive hardwarethat rotates the wheels of a car backwards and forwards. A ringand pinion gear set is made up of a ring with groovesthat are connected to the axles of the rear wheels and of a groovedpinion that is connected to the front wheel.
Likewise, people ask, how do I find my ring and pinion ratio?
Count the number of teeth on the pinion gear andcount the number of teeth on the ring gear. Divide thering gear teeth number by the number of teeth on thepinion. The result is your gear ratio. Note: you mayneed to round off the number.
Can you tell gear ratio from Vin?
How to Find Out the Gear Ratio With the VINNumber
- Find the VIN of your vehicle. It can be found on the sticker onthe inside of the driver's side door or on a stamped metal plateembedded in the dashboard above the steering wheel.
- Identify the VDS section, the fourth through eighth digits ofthe VIN.
Related Question Answers
What is a 9 rear end?
The center section of the 9 inch rear endis removable allowing you to swap gears or differentials on abench. Nine inch Ford rear ends came in many widths andconfigurations. Depending on the application, the rear endmay be heavier duty, be made of high performance materials or havea locking differential.What do the numbers on a ring gear mean?
The number is expressed in a ratio, whichrepresents the number of teeth on the ring geardivided by the number of teeth on the pinion. For example, atruck with a 3.73:1 gear ratio means that the driveshaft will turn 3.73 times for each complete wheelspin.How do I know what size rear end I have?
Measure the diameter of the ring gear. This measurementequals the size of your rear end. Count how manybolts are on the inspection cover. If you have 10 bolts,then your Ford has a 7.5-inch or an 8.8-inch rearend.What RPO code is gear ratio?
GM RPO Codes – Factory Identification Labels andInterpretation
| RPO Code | Description | Ratio |
| GU3 | Axle Rear | 2.93 |
| GU4 | Axle Rear | 3.08 |
| GU5 | Axle Rear | 3.23 |
| GU6 | Axle Rear | 3.42 |
What is ring and pinion gear ratio?
The calculation uses the number of teeth in the ringgear and divides it by the number of teeth in the piniongear, to provide you with a result to 1 ratio. Forexample, if the pinion gear has 41 teeth, and the ringgear has 11 teeth, the ratio would be calculated as41/11 which = 3.73 so 3.73:1.What is a pinion gear?
Definition of Pinion Gear Generally, when meshing pair of gears, thesmaller gear is called a pinion gear. Also, it refersto the cylindrical gear that meshes with a rack in arack-and-pinion mechanism which transforms rotational motionto linear motion.How do you identify a differential?
Identify by Differential CoverShape Without an ID tag, differentials are identifiedby the number of cover bolts, the distinctive shape of the cover,the number of ring gear bolts, and ring gear diameter. They canalso be identified by whether the center section is an integral ordropout design.How do I know what gear ratio I have?
If you want to be accurate, then count the teeth. If youhave the rearend opened up where you can see the gears,count the teeth on the ring and pinion. Divide the ring teethnumber by the pinion teeth number. Example: 41 teeth on the ringand 10 teeth on the pinion = 4.10 gear ratioHow do you know what gear ratio you have?
To calculate speed ratio, otherwise knownas gear ratio, you divide the number of teeth of the inputgear by the number of teeth of the outputgear.What does changing your gear ratio do?
Having the correct gear ratio foryour truck and its tires will give you the best fueleconomy, improve acceleration, throttle response, and yourability to maintain highway speeds. When changing gears fortaller tires, you are heading to a numerically highergear ratio.How do I know what gear ratio My rear end is?
Turn the wheel TWO revolutions and count the number ofdriveshaft turns. The number of driveshaft rotations will help youdetermine your rear axle ratio. For example, if itturned 3 and a half times, it's a 3.50:1 ratio. If it turned4 and a quarter times, it's a 4.25:1 ratio.What does a higher gear ratio mean?
Gear ratios can be boiled down to a singlestatement: Higher ratios (with a lower numerical value) givebetter torque/acceleration and lower ratios allow forhigher top speeds and better fuel economy. Higher ratiosmean the engine has to run faster to achieve a givenspeed.How do you calculate gear ratio speed?
To calculate speed ratio, otherwise known asgear ratio, you divide the number of teeth of the inputgear by the number of teeth of the outputgear.What is a ring gear in a differential?
In rear-wheel drive automobiles the central drive shaft(or prop shaft) engages the differential through a hypoidgear (ring and pinion). The ring gear ismounted on the carrier of the planetary chain that forms thedifferential. This hypoid gear is a bevel gearthat changes the direction of the drive rotation.What's the difference between 3.73 and 4.10 gears?
What is the difference between a 3.73 gearratio and 4.10? The ratio is the number of teeth on thedriven gear (ring) divided by the number of teeth on thedrive gear (pinion). So, if the ring gear has 37teeth and the pinion has 9 teeth, the ratio is 4.11:1.What does 4.10 gear ratio mean?
When you hear people refer to numbers like 3.08, 3.73,or 4.10, they're talking about the ratio of thering-and-pinion gears in the rear axle—hence, thenumbers are more accurately 3.08:1, 3.73:1, or 4.10:1. Thatalso means that for every one turn of the ring gear,the pinion will turn 4.11 times.Does gear ratio affect horsepower?
Motor HP does not change when you change gearratios. A dynamometer measures torque and RPM, and from thosetwo values calculates horsepower. When you change gearratios both RPM and torque will change but horsepowerwill not.What gear ratio is best for towing?
The most popular rear end ratio in trucks todayis the 3:55, which sort of averages towing power and fueleconomy. This is a good ratio for the occasionaltowing or hauling individual. For a person who tows moreoften, and heavier loads, the 3:73 or 4:10 may be moreappropriate.Is it better to have a higher or lower gear ratio?
The lower the number, the faster the car will gowith the same number of engine revolutions. The higher thenumber the better the car will accelerate, but at theexpense of high speed cruising. Now for the confusing partof the story. A high numerical gear ratio is called alow gear or low rear end, and viceversa. 
