Test Six - Transmission In Overdrive Fourth Gear

NOTE: This test checks line pressure at the overdrive clutch in fourth gear range. Use 300 psi Test Gauge C-3292, or equivalent for this test. The test should be performed on the road or on a chassis dyno.

1. Remove tachometer; it is not needed for this test.
2. Move 300 psi Gauge to overdrive clutch pressure test port. Then remove other gauge and reinstall test port plug.
3. Lower vehicle.
4. Turn OD switch on.
5. Secure test gauge so it can be viewed from drivers seat.
6. Start engine and shift into D range.
7. Increase vehicle speed gradually until 3-4 shift occurs and note gauge pressure.
8. Pressure should be 469 - 496 kPa (68 - 72 psi) with closed throttle and increase to 620 - 827 kPa (90 - 120 psi) at 1/2 to 3/4 throttle. Note that pressure can increase to around 896 kPa (130 psi) at full throttle.
9. Return to shop or move vehicle off chassis dyno.