When the gear selector lever is moved to the REVERSE (R) position (from the PARK position) the following changes occur in the transmission's hydraulic and electrical systems.

Manual Valve

With the manual valve in the REVERSE position, line (2) pressure is directed into the reverse (22) fluid circuit.

Primary Pressure Regulator Valve

Reverse (22) fluid pressure, at the primary regulator valve plunger, boosts line (2) pressure for the additional torque requirements in REVERSE. Throttle signal (10) fluid pressure from the line pressure control solenoid valve (SLT) acting on the primary regulator valve plunger also helps determine line (2) pressure in REVERSE depending on throttle position and other TCM input signals.

#7 Accumulator Check Valve Assembly

Reverse (22) fluid pressure is routed to the #7 accumulator check valve assembly where it passes into the reverse clutch (23) circuit. Reverse (22) fluid pressure moves the check valve against spring force in order to cushion the apply of the low and reverse clutch.

M1 Shift Valve

Reverse clutch (23) fluid passes through the M1 shift valve into the low and reverse clutch (24) fluid circuit.

Low and Reverse Clutch (B3) Assembly

Low and reverse clutch (24) fluid is routed to the low and reverse clutch piston to apply the low and reverse clutch plates.

Reverse Shift Solenoid (SS) Valve Assembly (S5)

The normally closed reverse SS valve assembly is energized, allowing fluid pressure in the S5 signal (18) fluid circuit to exhaust through the solenoid.

#6 Reverse Shift Ball Check Valve

Reverse (22) fluid seats the reverse shift ball check valve against the drive (19) fluid passage and enters the drive or reverse (20) fluid passage.

Shift Pressure Relay Valve

S5 signal (18) fluid is exhausted from the shift pressure relay valve and spring force moves the valve to the released position to allow drive or reverse (20) fluid to enter the direct clutch feed 1 (27) fluid circuit.

M1 Shift Valve

Direct clutch feed 1 (27) fluid passes through the M1 shift valve into the direct clutch feed 2 (28) fluid circuit.

M2 Shift Valve

Direct clutch feed 2 (28) fluid passes through the M2 shift valve into the direct clutch (29) fluid circuit.

#1 Accumulator Check Valve Assembly

Direct clutch (29) fluid pressure is routed to the #1 accumulator check valve assembly and moves the check valve against spring force in order to cushion the apply of the direct clutch.

Direct Clutch (C2) Assembly

Direct clutch (29) fluid is routed to the direct clutch piston to apply the direct clutch plates.

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

The normally closed 1-2, 2-3, reverse SS valve assembly is energized. However, because there is no fluid supplied to the circuit, the 1-2, 2-3, reverse SS valve assembly has no effect in REVERSE.

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