Dodge Ram Truck 1500-2500-3500. Manual — part 1806

Line pressure on the 3-4 shift valve overcomes valve
spring pressure moving the valve to the upshift posi-
tion. This action exposes the feed passages to the 3-4
timing valve, 3-4 quick fill valve, 3-4 accumulator, and
ultimately to the overdrive piston.

3-4 Shift Valve After Shift

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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

DR/DH

3-4 TIMING VALVE

The 3-4 timing valve is moved by line pressure com-
ing through the 3-4 shift valve or the converter clutch
valve.

3-4 Shift Valve After Shift

DR/DH

AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

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After the shift, the timing valve holds the 2-3 shift
valve in an upshift position. The purpose is to prevent
the 2-3 valve from downshifting while either the over-
drive clutch or converter clutch is applied.

3-4 Shift Valve Before Shift

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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

DR/DH

3-4 QUICK FILL VALVE

The 3-4 quick fill valve provides faster engagement of
the overdrive clutch during 3-4 upshifts. The valve
temporarily bypasses the clutch piston feed orifice at
the start of a 3-4 upshift.

3-4 Shift Valve Before Shift

DR/DH

AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

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