Chevrolet 1358899 Seal,Automatic Transmission Case Extension

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The following oil seals can be replaced without removing the transmission from the car, the speedometer gear seal as well as the extension oil seal. In order to remove the seal of the speedometer gear, first, the car has to be lifted to get access to the link underneath and the car is to be fixed on stands firmly. Remove the cable from the speedometer, then unscrew the lockwasher, bolt and lockplate for the extension, then remove this lockplate. Loosen and then remove the fitting gear and shaft from the extension using a screwdriver then pop out the O-ring. For installation: reverse the information provided under removal procedure, do not forget to lubricate the new seal with transmission lubricant and, thereafter, the pouring of the assembly so that the slot in the fitting is in engages with the lockplate boss on the extension. For the extension oil seal first unbolt the drive shaft and any other items needed for extra space for the seal. Very gently remove the previous seal and ascertain the condition of the counter bore before washing it. Before assembling the new seal to the shaft the spaces between the lips of the new seal should be pre-coated with the transmission lubricants while the outer diameter should be coated with an appropriate sealant. To install the seal, place the lips towards the center and remain in this position until the flange comes into contact with the surface, in the process a tubular spacer can be used. Last but not the least, replace every other component that you might have removed from the vehicle such as the drive shaft.

The extension housing oil seal unlike other parts can be done without the transmission being removed from the car. It is advisable to start the operation by lifting the car up to a comfortable working level using the jack and supporting it by means of readily available jack-stands. Empty the transmission of lubricant as required. Next, remove the driveshaft. Using seal removal tool or simple large screwdriver remove the old worn out seal and clean the counter bore to assess the extent of the damage. On the outer diameter, you have to put some sealant and in the region between two lips of the new seal, there should be an application of transmission oil. It is best to push the seal on the flange with the lip turned in until the flange grabs the seal, it can be forced with a seal driver, a large pipe wrench or a socket wrench or with a section of pipe of the proper outside diameter. Following installation ensure that the driveshaft is reinstalled, then you make sure that you fill the transmission with the appropriate lubricant.

Drive the new bushing in from the rear, lubricating the inside of the bushing and seal.

Place the vehicle over a pit or jack it up to gain access to the transmission, ensuring it is supported with jack stands.

To remove the oil seal and bushing, remove the driveshaft and carefully tap the dust shield (if equipped) to the rear and remove it from the transmission. On cast iron case (heavy duty) five-speed manual transmissions, remove the nut and U-joint flange. Using a screwdriver or seal removal tool, carefully pry the oil seal and bushing (if equipped) out of the rear of the transmission, being careful not to damage the splines on the transmission output shaft.

Yes, this operation can be carried out without removing the transmission from the vehicle.

Finally, reinstall the driveshaft and check the fluid level in the transmission unit.

Disconnect the speedometer cable, remove the lockplate to extension bolt and lockwasher, and then take off the lockplate.

Use a screwdriver to pry the fitting gear and shaft from the extension, and then pry out the O-ring.

Lubricate the splines of the transmission output shaft and the outside of the driveshaft yoke with lightweight grease before reinstalling the driveshaft, being cautious not to damage the lip of the new seal.

Lubricate the splines of the transmission output shaft and the outside of the driveshaft sleeve yoke with lightweight grease before installing the driveshaft, being careful not to damage the lip of the new seal.

Lubricate the splines of the transmission output shaft and the outside of the driveshaft sleeve yoke with lightweight grease before installing the driveshaft, being careful not to damage the lip of the new seal.

Oil leaks in a transmission frequently occur due to wear of the extension housing oil seal and bushing (if equipped), or the speedometer drive gear oil seal and o-ring.