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

4th 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 3rd/4th shift fork (230) forward moves the 3rd/4th synchronizer sleeve (234). The synchronizer sleeve (234) slides on the synchronizer hub. The inner teeth on the synchronizer sleeve push against the synchronizer ring teeth, causing the synchronizer ring to contact, and the 4th gear (140) and the input shaft to match speeds. The synchronizer sleeve (234) then engages the selector teeth on 4th gear (140). The synchronizer hub is pressed on the input shaft (100). Power flow is now from the input shaft (100) through the synchronizer, to the 4th gear (140) to the countershaft (400) and to the output shaft (150).

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