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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1159 (Manual Transmission - AISIN AY6) >> Description and Operation >> Transmission System Description and Operation >> 2nd Gear Power Flow >> 2nd Gear

2nd Gear

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Moving the 1st/2nd shift fork (210) rearward moves the 1st/2nd synchronizer sleeve (170). The synchronizer sleeve (170) slides on the synchronizer hub. The inner teeth on the synchronizer sleeve push against the synchronizer ring teeth, causing the synchronizer rings to contact, and the 2nd gear (120) and the countershaft to match speeds. The synchronizer sleeve (170) then engages the selector teeth on 2nd gear (120). The synchronizer hub is pressed on the countershaft (400). Power flow is now from the input shaft (100) to the 2nd gear (120), through the synchronizer to the countershaft (400) and to the output shaft (150).

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