GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
1999
🢒
GMC C Pickup - 2WD
🢒
Transmission/Transaxle
🢒
Automatic Transmission - 4L80-E
🢒 Harsh Shift D4 to D3, D2, or D1
Harsh Shifts -- Fourth to Third, Second, or First
Checks
Cause
Spring Assembly (506)
Not functioning
Checkball
Plugged
Snap Ring (511)
Not seated
