Test Procedure

All pressure readings should be taken with the transmission fluid level full, transmission oil at the normal operating temperature, and the engine at 1500 RPM. Check the transmission for proper operation in each gear position that is in question or if a specific element is in question, check the pressure readings in at least two gear positions that employ that element. Refer to SCHEMATICS AND DIAGRAMS  to determine the correct pressures for each element in a given gear position.

Some common pressures that can be measured to evaluate pump and clutch performance are the upshift/downshift pressures, garage shift pressures, and TCC pressure. The upshift/downshift pressure for all shifts are shown in UPSHIFT PRESSURES  table and DOWNSHIFT PRESSURES  table. In-gear maximum pressure for each gear position is shown in IN-GEAR PRESSURES  table. The garage shift pressure when performing a N-R shift is 220 psi for 4.7L equipped vehicles and 250 psi for 5.7L equipped vehicles. The garage shift pressure for the R-N shift is 120 psi. The garage shift pressure for the N-1 shift is 135 psi for 4.7L equipped vehicles and 165 psi for 5.7L equipped vehicles. Torque converter lock-up pressure is 120 psi for 4.7L equipped vehicles and 125 psi for 5.7L equipped vehicles.