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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1682 (Automatic Transmission - 6L45/6L50/6L80/6L90 - Description And Operation) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Drive Range, First Gear Engine Braking >> Fluid Pressure is Directed to the 1-2-3-4 Clutch and the Low and Reverse Clutch to Provide Engine Braking >> #1 Ball Check Valve

#1 Ball Check Valve

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Drive B fluid seats the #1 ball check valve against drive 1-6 fluid to force drive B fluid into the CB26/C1234 feed passage. CB26/C1234 feed fluid is routed to the #6 ball check valve, through orifice #43 and, to the 2-6 clutch regulator valve. CB26/C1234 feed fluid passes through the 2-6 clutch regulator valve and enters the pressure switch 3 (PS3) fluid circuit. PS3 fluid is then routed to the normally closed pressure switch 3 and opens the switch.

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