Road Test
- Operate vehicle in Overdrive. Accelerate using steady throttle pressure. Note shift points for 2nd, 3rd, Overdrive and TCC application. TCC application should occur in 3rd or Overdrive.
- Torque converter clutch will not engage until engine coolant has reached a temperature of 130°F (54°C). Compare shift points to shift speed charts. See Fig 1. If TCC application is not obtained, see appropriate AUTO TRANS DIAGNOSIS - 4L60/4L80 article in AUTOMATIC TRANSMISSIONS.
- Operate vehicle in Overdrive normally at 40-55 MPH with throttle in half-open position. Ensure TCC releases, and note 3rd gear downshift point. Repeat procedure with wide open throttle. Ensure TCC releases, and note 2nd gear downshift point.
- Operate vehicle in Overdrive normally at 40-55 MPH. Release accelerator while manually shifting transmission to 3rd gear. Ensure TCC releases and engine braking is felt, and note 3rd gear downshift point.
- Operate vehicle in Overdrive normally at 40-45 MPH. Release accelerator while manually shifting transmission into 2nd gear. Ensure TCC releases and engine braking is felt, and note 2nd gear downshift point.
- With transmission in Overdrive, accelerate normally to 25 MPH, allowing vehicle to upshift normally. Release accelerator while manually shifting transmission into 1st gear. Ensure TCC releases and engine braking is felt, and note 1st gear downshift point.
- With transmission in Overdrive, accelerate to 4th gear with TCC applied. Release accelerator. Lightly apply brakes, and ensure TCC releases and note speed at which downshifts occur. Compare shift points noted to shift speed charts. See Fig 1.
- Place transmission in 3rd gear with vehicle stopped. Accelerate, and note 1st-2nd and 2nd-3rd shift points. Repeat procedure with transmission in 2nd gear. Note 1st-2nd shift point. Accelerate to 25 MPH. Ensure 2nd-3rd gear upshift does not occur and TCC does not engage.
- Place transmission in 1st gear with vehicle stopped. Accelerate to 15 MPH. Ensure upshifts do not occur and TCC does not engage. With vehicle stopped, place transmission in Reverse and slowly accelerate to observe reverse gear operation.
- Compare all shift points to shift speed charts. See Fig 1. If shift points are not within approximate speed listed, see TROUBLE SHOOTING . Control pressure can also be checked. See CONTROL PRESSURE TEST.
CLUTCH & BAND APPLICATION CHART (4L60-E)
| Selector Lever Position | Shift Solenoid Position | Elements In Use | |
|---|---|---|---|
| "D" (Overdrive) | |||
| First Gear | 1-2 ON/2-3 ON | Forward Clutch, Forward Sprag & Low Roller Clutch | |
| Second Gear | 1-2 OFF/2-3 ON | Forward Clutch, Forward Sprag & 2-4 Band | |
| Third Gear | 1-2 OFF/2-3 OFF | Forward Clutch, Forward Sprag & 3-4 Clutch | |
| Overdrive | 1-2 ON/2-3 OFF | Forward Clutch 2-4 Band & 3-4 Clutch | |
| "D" (Drive) | |||
| First Gear | 1-2 ON/2-3 ON | Forward Clutch, Forward Sprag, Low Roller Clutch & Overrun Clutch | |
| Second Gear | 1-2 OFF/2-3 ON | Forward Clutch, Forward Sprag, Overrun Clutch & 2-4 Band, | |
| Third Gear | 1-2 OFF/2-3 OFF | Forward Clutch, Forward Sprag, Overrun Clutch & 3-4 Clutch | |
| "2" (Intermediate) | |||
| First Gear | 1-2 ON/2-3 ON | Forward Clutch, Forward Sprag, Low Roller Clutch & Overrun Clutch | |
| Second Gear | 1-2 OFF/2-3 ON | Forward Clutch, Forward Sprag, Overrun Clutch & 2-4 Band | |
| "1" (Low) | |||
| First Gear | 1-2 ON/2-3 ON | Forward Clutch, Forward Sprag, Low Reverse Clutch, Low Roller Clutch & Overrun Clutch | |
| "R" (Reverse) | 1-2 ON/2-3 ON | Low Reverse Clutch & Reverse Input Clutch | |
| "N"/"P" (Neutral or Park) | 1-2 ON/2-3 ON | All Clutches & Bands Released or Ineffective | |