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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Automatic Transmission - 6L50/6L80/6L90 - Service, Diagnosis & Troubleshooting) >> No Fourth, Fifth, and Sixth Gear

No Fourth, Fifth, and Sixth Gear

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Cadillac Escalade EXT, 2007 Cadillac Escalade ESV, and 2007 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
No Fourth, Fifth, and Sixth Gear

Checks Causes
4-5-6 (with Turbine Shaft) Clutch Assembly (56)
  • Inspect for damaged or worn clutch plates (433-435).
  • Inspect for damaged piston (439), piston dam (437), dam retaining ring (436), and clutch spring (438).
  • Inspect for improper selective 4-5-6 clutch backing plate retaining ring (431).
  • Inspect for cut, worn, or damaged turbine shaft fluid seal rings (442).
  • Inspect for damaged or distorted turbine shaft.
Control Valve Upper Body Assembly (304) Inspect the 1/Reverse band and 4-5-6 clutch regulator valve (327) and spring (326) for wear or damage.
4-5-6 Clutch (with Output Carrier Shaft and Dampener) Hub Assembly (58) Inspect the hub assembly (475), dampener (476), and apply plate (477) for wear or damage.
Output Carrier Assembly (68) Inspect for damaged or stripped internal splines on the output carrier assembly.
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