How to Replace Your Transmission Gear

The transmission of your car has gears that shift your engine's RPM to make it go faster. You go from gear to gear so that your car becomes more energy efficient as it goes faster and faster.

Once your transmission begins slipping your car won't start. Therefore, it's quite easy to know when your gear might require replacing. Usually it's when its dog teeth are worn to the point of compromised shifting.

If you wish to replace your transmission by yourself, here are the steps you should follow. It mostly involves inspecting everything and checking which parts or gears require replacement. If this procedure is too advanced for your auto repair skills, let your mechanic handle everything instead.

Transmission Gear: How to Replace It

  • Tool Requirements and Preparation: You will need a 17-millimeter hex key, a 30-millimeter deep socket, 2 muffler gaskets, and a transmission gear replacement. As for transmission replacement, you need to first use lift ramps to raise your car's rear to keep your wheels from turning as you work. Wheel turning can't be prevented by the parking brake alone when loosening the expansion nut. The engine and transmission should be supported by disconnecting the rear transmission mounts and placing the jack stand under the transmission case.
  • Empty the Oil and Remove the Transmission: Empty the oil out of the transmission. Use a 17-millimeter hex wrench to loosen the plug and have an oil trail on standby to catch the lube. Remove the drain plug and filler for cleaning. Take off the speedometer cable connected to the rear transmission cover. Detach the shift linkage for good measure. Gain access to the transmission gear by removing the muffler. Disconnect the ground strap and remove the 2 rear transmission nuts holding up the transmission.
  • Remove the Rear Cover and Shift Fork: Remove the nuts and washers connecting the transmission rear cover to the housing. Don't let the intermediate plate slide off. Don't let the bearings and gears fall out after removing the rear cover. Replace at least 2 of the nuts with spacers on the rear studs. Loosen the shift fork's 13-millimeter bolt and then slide the slider off the driver shaft. Inspect the inner teeth for any wear and tear.
  • Remove the First Gear and Reinstall Everything: Remove the first transmission gear with a 300-millimeter deep socket on the expansion bolt. Slide the whole first gear assembly off of the driveshaft and replace it if it ahs worn-out dog teeth. After first gear reassembly, reinstall everything you've uninstalled in reverse order of removal. Take note of the correct torque specifications via your car manual. Don't forget to fill your transmission with transmission fluid for good measure. Afterwards, test-drive your car to see if it's working properly.

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