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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 622 (Automatic Transaxle, 4T65-E Diagnostics (Troubleshooting)) >> Troubleshooting >> Slipping or No First Gear

Slipping or No First Gear

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Slipping or No First Gear

Checks Cause
DEFINITION: A large engine RPM increase is noted in first gear, Drive range, with little or no vehicle forward speed increase. Second, third, and fourth gear operation are normal. Shifts into first gear are soft or do not occur. First gear ratio is 2.921:1.
Automatic Transmission Fluid Level Low fluid level
Transmission Main Line Pressure Low transmission main line pressure
Oil Filter Assembly
  • The oil filter assembly (100) is missing, plugged, or damaged.
  • The oil filter seal assembly (101) is missing or is damaged.
Accumulator and Manual 2-1 Band Servo Assembly
  • A loose or damaged forward band servo oil pipe (124)
  • Loose manual 2-1 band servo cover of accumulator cover bolts (103, 131)
  • A missing or a damaged manual 2-1 servo cover gasket (105)
  • A damaged accumulator cover spacer plate assembly (134)
Forward Band Servo Assembly
  • The servo piston oil seal ring (18) is missing or damaged.
  • The servo piston (16) is damaged or stuck in the servo cover (13).
  • The servo piston cushion spring (19) or the retainer (20) is missing or damaged.
  • The servo piston pin (21) is not engaged to the forward band assembly (688).
  • The forward band assembly (688) is worn or burned.
  • The forward band assembly (688) is disengaged from the anchor pin (117A).
  • The band anchor pin (117A) is loose or missing.
Control Valve Body Assembly
  • The 1-2 shift valve (318) is stuck or binding.
  • The #3 ball check valve (372) is missing.
Input Clutch Assembly
  • The input clutch sprag assembly (722) is damaged or misassembled.
  • The input clutch housing oil seal rings (628) are missing or damaged.
  • The input clutch housing ball check valve assembly (633) is missing or damaged.
  • The input clutch piston inner/outer seals (634/635) are missing or damaged.
  • The input clutch piston (636) is damaged.
  • The input clutch plates (645-658) are worn.
1-2 Clutch Roller Assembly The 1-2 clutch roller assembly (683) is damaged.
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