As vehicle speed increases and operating conditions become appropriate, the TCM energizes the 3-4, 4-5 shift solenoid valve assembly (S4) to shift the transmission into Third gear. The manual valve remains in the DRIVE (D) position and line (2) pressure continues to feed the drive (19) fluid circuit.

3-4, 4-5 Shift Solenoid (SS) Valve Assembly (S4)

The 3-4, 4-5 SS valve assembly is energized, causing fluid pressure to build-up in the S4 signal (17) fluid circuit.

U2 Shift Valve

S4 signal (17) fluid is routed through the U2 shift valve into the 345 enable (50) fluid circuit.

U1 Shift Valve

345 enable (50) fluid is routed to the U1 shift valve and applies the valve against spring force, allowing PN12345 (47) fluid to pass through the valve into the servo feed (44) fluid circuit.

U2 Shift Valve

Servo feed (44) fluid is routed through the U2 shift valve into the servo apply (45) fluid circuit.

#9 Reverse Shift Restrict Ball Check Valve

Servo apply (45) fluid seats the reverse shift restrict ball check valve against the servo release (43) fluid passage and enters the 3rd gear band apply (46) fluid passage.

3rd Gear Band (B4) Servo Piston Assembly

3rd gear band apply (46) fluid is routed to the 3rd gear band servo piston assembly which applies the 3rd gear band assembly to hold the 4-5 clutch drum assembly.

Solenoid Relay Valve

3rd gear band apply (46) fluid also passes through orifice #30 and, together with spring force, overcomes solenoid modulator (9) fluid pressure and moves the solenoid relay valve to the released position. This allows 1-2 reverse clutch (39) fluid to exhaust through the B5 control 2 (38) fluid circuit.

1-2 Reverse Clutch (B5) Assembly

1-2 reverse clutch (39) fluid exhausts from the 1-2 reverse clutch assembly allowing the 1-2 reverse clutch to release.

Lock Up Relay Valve

1-2 reverse clutch (39) fluid also exhausts from the lock up relay valve in preparation for a possible torque converter clutch apply.

Solenoid Relay Valve

With the solenoid relay valve in the released position, lock up control (12) fluid is allowed to enter the TCC signal (13) fluid circuit.

Lock Up Control Valve

TCC signal (13) fluid is routed through the lock up relay valve and on to the lock up control valve in preparation for a possible torque converter clutch apply.

1-2, 2-3, Reverse Shift Solenoid (SS) Valve Assembly (S3):

Drive (19) fluid passes through orifice #24 into the S3 signal (16) fluid circuit in preparation for a shift. The normally closed 1-2, 2-3, reverse SS valve assembly is energized (ON), allowing any fluid pressure in the S3 signal (16) fluid circuit to exhaust through the solenoid.

Important: Power flow for Drive and M Range - Third Gear is exactly the same as Drive Range - Third Gear.

1. SUCTION
2. LINE
3. CONVERTER FEED
4. RELEASE
5. APPLY
6. EXHAUST ENABLE
7. COOLER
8. LUBE
9. SOLENOID MODULATOR
10. THROTTLE SIGNAL (SLT)
11. SHIFT CONTROL (SLS)
12. LOCK UP CONTROL (SLU)
13. TCC SIGNAL
14. S1 SIGNAL
15. S2 SIGNAL
16. S3 SIGNAL
17. S4 SIGNAL
18. S5 SIGNAL
19. DRIVE
20. DRIVE OR REVERSE
21. REGULATED DRIVE OR REVERSE
22. REVERSE
23. REVERSE CLUTCH
24. LOW AND REVERSE CLUTCH
25. REVERSE CONTROL
26. FORWARD CLUTCH
27. DIRECT CLUTCH FEED 1
28. DIRECT CLUTCH FEED 2
29. DIRECT CLUTCH
30. B2 CONTROL 1
31. B2 CONTROL 2
32. SECOND CLUTCH
33. B1 CONTROL 1
34. B1 CONTROL 2
35. B1 CONTROL 3
36. SECOND COAST CLUTCH
37. B5 CONTROL 1
38. B5 CONTROL 2
39. 1-2 REVERSE (B5) CLUTCH
40. 4-5 CLUTCH
41. B4 CONTROL
42. B4 RELEASE
43. SERVO RELEASE
44. SERVO FEED
45. SERVO APPLY
46. 3RD GEAR BAND APPLY
47. PN12345
48. PRN15
49. 234NCON
50. 345 ENABLE
51. 45 ENABLE
52. REVERSE INHIBIT
53. VENT
54. EXHAUST
55. SUMP
56. VOID
57. TORQUE CONVERTER SEAL DRAINBACK