Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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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))TROUBLESHOOTINGSLIPPING OR HARSH 1-2 SHIFT

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Slipping or Harsh 1-2 Shift

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Slipping or Harsh 1-2 Shift

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.

Slipping or Rough 1-2 Shift

Checks	Causes
Valve Body Assembly (60)	Mislocated valve body to spacer plate checkball or checkballs. 1-2 Shift valve train stuck due to sediment Gaskets or spacer plate incorrect, mispositioned or damaged 1-2 Accumulator valve stuck or damaged Face not flat 4-3 sequence valve stuck or damaged #1 or #8 checkball missing or mis-located 1-2 accumulator valve bushing rotated 180°
2-4 Servo Assembly (13-28)	Apply pin too long or too short 2nd servo apply piston seal missing, cut or damaged Restricted or missing oil passages Servo bore in case damaged
2nd Accumulator (55-57, 104)	Porosity in 1-2 accumulator cover or piston Piston seal or groove damaged Nicks or burrs in 1-2 accumulator housing Missing or restricted oil passage 1-2 accumulator piston spring not seated Rough finish in 1-2 accumulator bore in case A cracked 1-2 accumulator piston - allowing fluid to leak by
2-4 Band (602)	Worn or mispositioned
Oil Pump Assembly (4) or Case (103)	Faces not flat

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.