Air Pressure Tests: Notes

A "No Drive" condition can exist even with correct transmission fluid pressure, because of inoperative clutches or bands. The inoperative units can be located by substituting air pressure for fluid pressure to determine location of malfunction.
To make air pressure checks, drain transmission fluid. Remove oil pan and control valve body assembly. Install Adapter Plate (T82L-7006-A), with Adapter Plate Attaching Screws (T82P-7006-C) and control valve body gasket in place of control valve body. Tighten attaching screws 80-100 INCH lbs. (9-11 N.m). With a rubber-tipped air nozzle, apply air pressure in indicated locations. See Fig 1 .
If servo or accumulator does not move when tested, clean and inspect servo or accumulator to locate cause. See appropriate component under ON-VEHICLE SERVICE . If during test 2 clutches apply or clutch fails to operate, check fluid passages in case and front pump for blockage or damage.

NOTE: Air pressure should be regulated between 40 psi (2.8 kg/cm² ) and 90 psi (6.3 kg/cm² ). Compressed air used for test should be filtered and dry to avoid contaminating transmission fluid.

Fig 1: Identifying Air Pressure Test Apply Ports on Adapter Plate

Courtesy of FORD MOTOR CO.