Operation CHARM
: Car repair manuals for everyone.
Home
>>
GMC Truck
>>
1988
>>
S15/T15 4WD Jimmy V6-173 2.8L
>>
Repair and Diagnosis
>>
Transmission and Drivetrain
>>
Automatic Transmission/Transaxle
>>
Testing and Inspection
>>
Symptom Related Diagnostic Procedures
>>
3L30 (180/180C) Automatic Transmission
>>
Harsh 2-3 Detent Downshift at High Vehicle Speeds
Harsh 2-3 Detent Downshift at High Vehicle Speeds
1. High speed downshift valve stuck open.
2. Improper
band
adjustment.