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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 755 (AUTOMATIC TRANSMISSION, 4L60-E/4L65-E (TROUBLESHOOTING))TROUBLESHOOTINGSLIPS IN FIRST GEAR
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Slips in First Gear

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Slips in First Gear
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Slips in 1st Gear

Checks Causes
Forward Clutch Assembly (646-651)
  • Clutch plates worn
  • Porosity or damage in forward clutch piston
  • Forward clutch piston inner and outer seals missing, cut or damaged
  • Damaged forward clutch housing
  • Forward clutch housing retainer and ball assembly not sealing or damaged
Forward Clutch Accumulator (353-358)
  • Piston seal missing, cut or damaged
  • Piston out of its bore
  • Porosity in the piston or valve body
  • Stuck abuse valve
Input Housing and Shaft Assembly (621) Turbine shaft seals missing, cut or damaged
Valve Body (60)
  • 1-2 Accumulator valve stuck
  • Face not flat, damaged lands or interconnected passages
  • Spacer plate or gaskets incorrect, mispositioned or damaged
Low Roller Clutch (678)
  • Damage to lugs to inner ramps
  • Rollers not free moving
  • Inadequate spring tension
  • Damage to inner splines
  • Lube passage plugged
Torque Converter (1) Stator roller clutch not holding
1-2 Accumulator Assembly (55-57, 104)
  • Porosity in piston or 1-2 Accumulator cover and pin assembly
  • Damaged ring grooves on piston
  • Piston seal missing, cut or damaged
  • Valve body to spacer plate gasket at 1-2 Accumulator cover, missing or damaged
  • Leak between piston and pin
  • Broken 1-2 Accumulator spring
Line Pressure Refer to Oil Pressure High or Low .
2-4 Servo Assembly (13-28) 4th Servo piston in backward
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.