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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1880 (Automatic Transaxle - 4T45-E - Service, Diagnosis & Troubleshooting) >> No First Gear, Slips in First Gear

No First Gear, Slips in First Gear

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
No First Gear, Slips in First Gear

Checks Causes
Forward Clutch No apply or slipping
Piston and Seal Assembly (607) Binding, cracked, or leaking
Inner Seal (608) Plugged orifice
Clutch Plates (601-604) Worn friction, or broken splines
Snap Ring (600, 605) Out of position
Housing (609) Cracked, or plugged feed holes
Housing Retainer and Ball Assembly Missing or out of position
Springs (606) Binding
Input Sprag (515) Damaged or not holding
Lo Roller Clutch (652) Damaged or not holding
Forward Clutch Fluid Routing Fluid leak or restriction
Oil Feed Tubes (83)
  • Bent, broken, or plugged
  • Leaking seal rings
Forward Clutch Support (114)
  • Porosity
  • Leaking or damaged seal rings
  • Plugged feed holes
Channel Plate (27) and Gasket (28)
  • Porosity
  • Misalignment
  • Fluid leaking across the channels
  • Restriction
PSA (13) Leaking drive switch O-ring
1-2 Shift Solenoid Valve (305)
  • Failed OFF
  • Leaking
1-2 Shift Valve (302) Stuck in upshifted position
2-3 Shift Solenoid Valve (305)
  • Failed ON
  • Plugged exhaust
  • Manual Valve (800)
  • Shift Linkage
Misalignment
Torque Converter (55) Stator roller clutch is not holding
Line Pressure Low Pressure
Refer to High or Low Line Pressure .