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2006
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Sierra 1500 HD, 4WD
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Section 236 (Automatic Transmission - 4L60-E/4L65-E (Service & Replacement))
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No Fourth Gear, or Slips in Fourth Gear
No Fourth Gear, or Slips in Fourth Gear
WARNING:
This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
No Fourth Gear, Or Slips In Fourth Gear
Checks
Causes
Check Ball
Wrong location or extra check ball
Orificed Cup Plug
Not fully pressed in