Description and Operation of 48RE (A-618) 4 Speed Transmission
Valve Body: Description and Operation
AS68RC Automatic Transmission
Description
DESCRIPTION
The valve body consists of a two piece aluminum valve body. Extensive electronic control effected by a microcomputer (the automatic transmission
electronic control unit) over the hydraulic circuitry enables precise control over gearshifts. The valve body contains valves and pressure sensors that
control fluid delivery to the torque converter clutch, forward clutches, and brake clutches.
UPPER VALVE BODY
UPPER VALVE BODY
The upper valve body contains the following components:
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1 = Combined Drain
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2 = Gain change solenoid valve
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3 = Manual valve
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4 = Modulator valve
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5 = Shift solenoid valve No. 3
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6 = Shift solenoid valve No. 2
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7 = Shift valve No. 1
LOWER VALVE BODY