Reverse

Reverse:

REVERSE

"A" SHIFT SOLENOID - ON
INPUT CLUTCH - APPLIED
REVERSE BAND - APPLIED
"B" SHIFT SOLENOID - ON
INPUT SPRAG - HOLDING

When the gear selector lever is moved to REVERSE (R), the manual valve allows line pressure to be fed through the PRN passage into the reverse fluid passage. Reverse fluid seats #5 checkball (372) and directs fluid to the reverse servo boost valve (365) and through the reverse servo feed orifice. Fluid passing through the orifice enters the reverse servo passage and forces the reverse servo piston (44) to overcome spring pressure to apply the reverse band (615). Depending on throttle position, engine manifold vacuum supply to the vacuum modulator can boost to full line pressure, 2100 kPa (305 psi) at 0 kPa (0" psi) engine manifold vacuum.

Manual Valve (404): Is moved manually to the right through the gear selector lever and allows line pressure to enter the reverse fluid passage through the PRN fluid passage.

#5 Checkball (373): Located in the valve body, (300), it blocks the reverse servo feed passage forcing reverse fluid through an orifice in the spacer plate (370) into the reverse servo passage. When the manual valve (404) is moved out of reverse, the checkball unseats allowing reverse servo fluid to exhaust through the ball seat instead of through the orifice.

Reverse Boost Valve (367): Opens under hard acceleration (high line pressure/high throttle position) to allow reverse fluid to by-pass the feed orifice and enter the reverse servo passage. This provides for a quick fill of the servo passage and quick apply of the reverse band to prevent band slippage during abusive shifts from Park or Neutral to Reverse.

Reverse Servo Assembly (39-49): Applies the reverse band (615) in response to reverse servo fluid pressure feeding into the servo cover (40) side of the reverse servo piston (44).

Reverse Band Assembly (615): Wraps around the second clutch housing (617) and holds the input carrier (672), through the reverse reaction drum (669), allowing the vehicle to move in reverse.