Low Range - First Gear

Lo Range - First Gear:

LO RANGE - FIRST GEAR (Valves In First Gear Position)

FORWARD CLUTCH - APPLIED
LO ROLLER CLUTCH - HOLDING
REAR BAND - APPLIED

Maximum downhill braking can be attained at speeds below approximately 40 mph with the selector lever in Lo range position, Lo range oil from the manual valve is then directed as shown.
1. Rear Servo
2. 1-2 Accumulator Valve
3. Detent Valve
4. 1-2 Shift Valve

BASIC CONTROL

Lo range oil flows past a checkball to the apply side of the rear servo piston and to the 1-2 accumulator valve to raise the 1-2 accumulator oil to line pressure for a smooth band apply.

Lo range oil acts on the detent valve. Combined with the detent spring, Lo range oil holds the detent valve against line oil acting on the detent valve. This causes drive oil to flow by the detent valve into the detent and modulator passages. Modulator and detent oil at line pressure, acting on the 1-2 valve, overcomes governor oil and Lo oil on the 1-2 shift valve at speeds below approximately 40 mph and the transmission will shift to First Gear.

With the transmission in First Gear - Lo Range, the transmission cannot upshift to Second Gear regardless of vehicle or engine speed.

SUMMARY

The forward clutch and rear band are applied. The transmission is in Lo Range - First Gear.