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HYDRA – MATIC 4L40 – E / 5L40 – E

AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
24
Copyright © 2002 ATSG
Figure 22
Check Ball No. 1: Seats to force reverse lockout fluid through orifice 13 in the spacer plate, and into the
reverse clutch circuit to help control the apply rate of the reverse clutch.
Check Ball No. 2: Seats to allow either reverse fluid (In Reverse) or 2345 fluid (In 2nd, 3rd, 4th, and 5th) to
enter the reverse or 2345 circuit, while blocking the other fluid circuit.
Check Ball No. 3: Seats to force four five fluid through orifice 27 in the spacer plate and into the overdrive
clutch feed circuit to help control the apply rate of the overdrive clutch.
Check Ball No. 4: Seats to force 123 fluid through orifice 16 in the spacer plate and into the coast clutch
feed circuit to help control the apply rate of the coast clutch.
Check Ball No. 5: Seats to force forward clutch fluid through orifice 17 in the spacer plate to help control
the apply rate of the coast clutch.
Check Ball No. 6: Seats to force forward clutch fluid through orifice 15 in the spacer plate and into the
forward clutch circuit to help control the apply rate of the forward clutch.
Check Ball No. 7: Seated by a calibrated spring that goes in channel plate before the check ball and
provides extra D432 fluid in the forward and coast clutch circuits to reduce garage shift response time.
Check Ball No. 8: Seats to allow either low/reverse clutch fluid (In 1st gear coast condition) or reverse
lockout (RLO) fluid (In Reverse) to enter the low/reverse clutch or reverse lockout circuit, while blocking
the other fluid circuit.
Check Ball No. 9: Seats to force two-three regulated fluid through orifice 22 in the spacer plate and into the
overdrive clutch feed 1 circuit to help control the apply rate of the overdrive clutch when in a 3rd gear coast
condition.
Check Ball No. 10: Seats to allow either three-two safety mode fluid (Safety Mode Operation Only) or
FDL fluid (In 1st Gear) to enter the 3-2 safety mode or FDL fluid circuit while blocking the other.
Check Ball No. 11: Seats to force two-three regulated fluid through orifice 23 in the spacer plate and into
the second coast clutch circuit to help control the apply rate of the 2nd coast clutch when in a 2nd gear coast
condition. Note: This Check Ball not used in 4L40-E models.
Check Ball No. 12: Seats to allow either overdrive clutch feed 1 fluid (In a 3rd Gear Coast condition) or
overdrive clutch feed 2 fluid (In 5th Gear) to enter the overdrive clutch circuit while blocking the other fluid
circuit.

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