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In the differential of auto/truck.
No, they are a matched machined set.
To change the pinion gear in a differential you must first open the differential, drain the gear oil and inspect the gears and bearings. Pinion gears and ring gears are usually done as a matched set so you should plan on replacing both. Remove the axle shafts and then mark the carrier bearing caps so they can be replaced in exactly the same location and direction that they came off. remove the caps and then pull the carrier out. Measure the pinion to axle centerline distance so that you can get the new pinion in the same spot. Remove the yoke retainer nut and the driveshaft yoke and then remove the pinion from the differential housing. You should be using new bearings and races so remove the old races from the differential housing and the old bearing from the Pinion gear. The shims from the old gear should be a good starting place to set up your new pinion depth. Test fit the new pinion to see if the pinion depth is right. Install pinion bearing races, bearings and new seal. Install new ring gear and set the gear lash You may have to shim the carrier or change the pinion depth to get the right gear lash. This process usually requires expert knowledge and specialized tools and you may want to consult a qualified mechanic to do the job. There are many more detailed descriptions on the net.
Broken gears. The differential or ring gear or pinion gears are broken.
An axle ratio is a comparison of the number of ring gear teeth to the number of pinion gear teeth in a differential. For instance, a 3.55 gear ratio means that there are 3.55 ring gear teeth to every 1 pinion tooth.
That's the drive gear assembly in your rear differential ( the center part that is bigger )
a gear found in the differential that meshes with the crown wheel to deliver drive threw a 90 degree angle to the road wheel
When working on the differential it's important to understand that it's far more than just replacing the part. If the pinion gear is not matched and properly adjusted to the ring gear, the differential will howl and fail prematurely. The process is not something that can be easily described, you really do need to have someone show you how.
The best way is to count the teeth on the ring gear and divide by the number of teeth on the pinion gear. Or you can count the number of turns of the pinion it takes to get one full turn of the ring gear. For example, if we divide a ring gear with 41 teeth by a pinion gear with 10 teeth we find that the gear ratio is 4.10:1 (41/10 = 4.10).
There are adjusrers on the sides of the ring gear housing for side clearance and the pinion gear depth is achieved by removing pinion gear and adding or removing shims to correct depth. should be done by an experienced technisian.v After the pinion depth is set(with shims). The backlash is set with shims under the side bearings.
count your teeth on your ring gear <big gear> and on you pinion <little gear> and the divide the ring gear teeth by the pinion
41 teeth on the ring gear, 10 on the pinion gear.