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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Automatic Transmission - ALLISON - Introduction (2 Of 2)) >> Repair Instructions >> Seal Replacement - Rear Propshaft >> Installation Procedure

Installation Procedure

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    IMPORTANT: Be sure the new seal has blue sealant coating the OD (4). This identifies the seal for use in the 1000 Series transmissions. The blue sealant identification is important because the 1000 Series transmissions have an overdrive ratio in fifth range and there is a potential for high output shaft speeds and resultant high seal temperature.
    Fig 1: Aligning Rear Propshaft Seal Lip Outward Onto J 43782
    GM659323Courtesy of GENERAL MOTORS CORP.
  1. Align the seal so the seal lip (2) is outward and the face of the steel case (1) will be against the driving face (3) of the tool. Install the new seal onto J 43782  . See Special Tools .
  2. Slide J 43782  over the output shaft until the seal enters the seal bore. See Special Tools . Strike J 43782  with a mallet (1) to drive the seal into the seal bore. See Special Tools . The seal is installed correctly when the shoulder of J 43782  squarely contacts the outer surface of the rear cover. See Special Tools .
    Fig 2: Installing Rear Propshaft Seal
    GM659330Courtesy of GENERAL MOTORS CORP.
  3. Install the yoke assembly onto the transmission. Refer to Output Flange/Yoke Replacement .
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