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Home >> Chevrolet >> 2001 >> C3500 HD 8.1 G, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Automatic Transmission Diagnosis - 4L80-E (Diesel)) >> Performance Tests >> Road Test >> Part Throttle Detent Downshift

Part Throttle Detent Downshift

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the gearshift lever in the Overdrive position.
  2. Accelerate the vehicle to 40-55 MPH in 4th gear.
  3. Quickly increase throttle angle to greater than 50 percent.
  4. Verify the TCC releases and transmission downshifts immediately to 3rd gear.
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