Ranger 2WD V6-245 4.0L (1990)
pressure in reverse.
16. The throttle downshift valve (16) reroutes line pressure to override the normal automatic upshift schedule and provide forced downshifts.
17. The manual control valve (17) moves with shift selector and directs control pressure to various passages to provide automatic function.
18. The 2-Low range coasting boost valve (18) boosts pressure in selector positions 1 and 2 at closed or nearly closed throttle.
19. The 1-2 shift valve (19) controls upshift from 1st to second and downshift from 2nd to 1st.
20. The D2 shift valve (20) is used in combination with the 1-2 shift valve to provide a 2nd gear start in 2 range.
21. The 2-3 shift valve (21) controls upshift from 2nd to high and downshift from high to 2nd.
22. The 2-3 throttle pressure modulator valve (22) provides a modulated pressure to the 2-3 shift valve at higher TV pressures. This modulated
pressure helps to delay 2-3 shifts at higher TV pressures.
23. The 4-3 torque demand valve (23) routes high clutch oil to the 3-4 shift valve at lower vacuums. This provides for a higher road speed 4-3 torque
demands at lower vacuum.
24. The converter clutch shift valve (24), along with the converter clutch shuttle valve and solenoid, controls converter clutch engagements and
disengagements.
25. The converter clutch throttle pressure modulator valve (25) sends a modulated pressure to the converter clutch shift valve at higher TV pressures.
This modulated pressure helps to delay converter clutch upshifts at higher TV pressures.
26. The 3-4 shift valve (26) controls the scheduling for 3-4 upshifts and 4-3 downshifts.
27. The 3-4 throttle pressure modulator valve (27) provides a modulated pressure on the 3-4 shift valve at high TV pressures. This modulated pressure
helps to delay 3-4 upshifts at higher TV pressures.
28. The converter clutch shuttle valve (28), when bottomed against the plug, directs flow so the converter clutch will be disengaged. When the valve
compresses the spring, flow is directed so the converter clutch engages. The solenoid also controls the position of this valve.
