Sierra 1500 4WD V8-6.0L VIN U (2006)
5. Install the convolute retainer tool over the inboard joint seal, being sure to capture the following convolutions:
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2-5 for the 1500 model (except 1500 HD)
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2-4 for the 1500 HD, 2500, 3500, and Hummer H2 models.
Important:
Assemble the tripot joint with the convolute retainer in the correct position, as illustrated.