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Replace the front differential side retainer oil seal.
1. Remove the oil seal by using flat tip screwdriver etc.
2. Using the ST, install the oil seal by lightly tapping with a plastic hammer.
  NOTE:
  - Use a new oil seal.
  - Check the identification marks (L, R) during installation not to mix up the oil seal RH and LH.
  - Apply gear oil to the oil seal lips.
  - Be sure to replace the differential side retainer oil seal whenever the front drive shaft is removed from the transmission.
  ST 18675AA000 DIFFERENTIAL SIDE OIL SEAL INSTALLER
  
  Fig 1: Installing Oil Seal Using Differential Side Oil Seal Installer
  Courtesy of SUBARU OF AMERICA, INC.
Attach the ST to converter case.
ST 498277200 STOPPER SET

Fig 2: Attaching ST To Converter Case
Courtesy of SUBARU OF AMERICA, INC.
Install the cushion rubber on the transmission.
Tightening torque:

40 N.m (4.1 kgf-m, 29.5 ft-lb)
Tap the transmission hanger in the rear side of transmission with a rubber hammer to bend it until it is in close contact with the transmission case.
CAUTION: Do not apply excessive load or impact to the transmission case.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Automatic Transmission Assembly: Installation