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.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Air Pressure Tests: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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