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Section 895 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Troubleshooting)
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Harsh Shift D4 to D3, D2, or D1
Harsh Shift D4 to D3, D2, or D1
WARNING:
This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Harsh Shift D4 to D3, D2, or D1
Checks
Cause
Spring Assembly (506)
Not functioning
Checkball Orifice
Plugged
Snap Ring (511)
Not seated
Scan Tool Shift Adapts
Maximum shift adapts