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transmission graphic
2008 GMC Yukon 2-mode Hybrid 2WD

From Christine & Scott Gable, About.com Guide

2008 GMC Yukon two-mode transmission cutaway

The transmission unit contains two 60 kW electric motors, three planet gear sets and four hydraulic wet clutches. The combination provides both continuously variable and fixed gear operation as well as electric propulsion all within the same housing.

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