- Solenoids (1)
- Manifold (2)
- Selector and pressure control valve (3)
- HI forward selector valve (4)
- Plate (5)
- Speed selector valve (6)
- HI forward directional spool and the speed selector spool (7)
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| Illustration 1 | g00485526 |
Transmission Hydraulic Control (Side View) (1) Solenoid (2) Manifold (3) Selector and pressure control valve (4) HI forward and first speed selector valve (5) Plate (6) Speed selector valve (7) HI forward directional spool and speed selector spool | |
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| Illustration 2 | g00485532 |
Transmission Hydraulic Control (End View) (8) No. 4 Clutch solenoid (9) No. 2 Clutch solenoid (10) No. 3 Clutch solenoid (11) No. 1 Clutch solenoid (12) No. 5 Clutch solenoid (13) No. 6 Clutch solenoid | |
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| Illustration 3 | g00485534 |
Transmission Hydraulic Control (Top View) (14) Inlet from the pump (15) LP plug (16) Outlet to the torque converter (17) P3 pressure tap | |
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| Illustration 4 | g00485535 |
Transmission Hydraulic Control (18) P1 pressure tap (19) P2 pressure tap | |
Oil for the hydraulic control enters through inlet (14). The oil then flows to the selector and pressure control valve.
Oil for the operation of the torque converter flows out of outlet (16) to the torque converter.
The clutch solenoids direct oil to the ends of the selector spools. The selector spools shift directing oil in order to engage the clutches.
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| Illustration 5 | g00485536 |
Transmission Hydraulic Control (Bottom View) (6) Selector valve (20) Passage to No. 3 Clutch (21) Passage to No. 2 Clutch (22) Passage to No. 1 Clutch (23) Passage to No. 6 Clutch (24) Passage to No. 5 Clutch (25) Passage to No. 4 Clutch | |
Oil to the clutches is sent through openings (20), (21), (22), (23), (24) and (25) in the speed selector valve. The speed selector valve is attached to the top of the planetary group.
Selector and Pressure Control Valve
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| Illustration 6 | g00979875 |
Selector and Pressure Control Valve (3) Selector control valve (26) Converter inlet ratio spool (27) Modulation relief spool (28) Direction selection spool (29) Speed selection spool for third speed, fourth speed, fifth speed, and sixth speed (30) Pressure differential valve (31) Load Piston (32) Directional selection spool (33) Speed selection spool for first speed and second speed (A) HI forward selection spool to No. 3 clutch solenoid (B) Directional selection spool to No. 2 clutch solenoid (C) Directional selection spool to No. 1 clutch solenoid (D) Speed selection spool to No. 5 solenoid (E) Converter inlet ratio valve to the torque converter (F) Pump to modulating relief valve (G) Speed selection spool to No. 4 clutch solenoid (H) Speed selection spool to No. 6 clutch solenoid | |
The selector and pressure control valve is under the top cover of the transmission.
Selector spools (29), (28), (32) and (33) are shifted when oil pressure is applied to one end of the spools. Each solenoid controls oil pressure to the end of one spool. If no pilot pressure oil is acting against the end of the spools, spring force will hold the spools against the stops. Switches in the transmission control lever direct electrical signals to the transmission electronic control module (ECM). The ECM activates the solenoids that control the speed and the direction of the transmission.
| Valve | Function |
| (26) Converter inlet ratio spool | This valve limits the maximum pressure to the torque converter. |
| (27) Modulating relief spool | This valve controls the maximum pressure in the system. |
| (28) Direction selection spool | This valve directs the oil to a direction clutch. |
| (29) Speed selection spool for third speed, fourth speed, fifth speed, and sixth speed | This valve directs the oil to the No. 4 or the No. 5 clutch. |
| (30) Pressure differential valve | This valve keeps a pressure differential between the speed and direction clutches. |
| (31) Load piston | This valve controls the rate of pressure increase in the clutches. |
| (32) Direction selection spool | This valve directs the oil to a direction clutch. |
| (33) Speed selection spool for first speed and second speed | This valve directs the oil to the No. 6 clutch. |