Extension Housing Assembly Installation

WARNING: This page is about a different variant/trim than selected.

Fig 1: Applying Sealant To Extension Housing To Transmission Case Mating Surface

Courtesy of GENERAL MOTORS CORP.

Apply sealant GM P/N 12345739, (Canadian P/N 10953472) or equivalent to the extension housing to the transmission case mating surface.

Fig 2: Applying Thread Sealer To Bolt Threads

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Apply thread sealer GM P/N 12346004, (Canadian P/N 10953480) or equivalent to the top 2 extension housing bolts.

Fig 3: Rear Extension Housing, Bolts, & Retainers

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NOTE: Align the 5th/6th shift shaft to the extension housing bore in order to install the extension housing.

Fig 4: Propshaft Transmission Yoke O-Ring

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Fig 5: Propshaft Transmission Yoke, Nut & Washer

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Install the propshaft transmission yoke (3).
Install the propshaft washer (2) and nut (1).
Use the J 45012: holder with the mounting bolts to hold the propshaft transmission yoke (3). Tighten the nut (1) to 136 N.m (100 lb ft).

Fig 6: Shift Control Cover & Bolts

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Install the shift control shaft cover (2).
Install the shift control shaft cover bolts (1) and tighten to 20 N.m (15 lb ft).

Fig 7: Transmission Holding Fixture Components

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Remove the DT 47678: flange (2) and DT 47678-10: adapter.
Remove the DT 47678: flange and DT 47678-10: adapter from J 3289-20: fixture (1).