How to Test Transmission Pressure

by Amanda Harrell
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Taking your car to the mechanic can be expensive. The transmission on your car is something that must be maintained for your car to run properly. You should test the transmission pressure from time to time to ensure that no imminent repairs need to be made on your vehicle. Once your transmission goes, you could end up spending over a thousand dollars to fix it. However, if you keep it maintained and spot minor problems from the start, you can save yourself a lot of time and money.

Step 1

Place the car jack under the vehicle and jack it up off of the ground.

Step 2

Place blocks under the front two tires in order to keep the front end of the car raised.

Step 3

Place the tachometer to the engine in order to accurately record the engine speed.

Step 4

Turn on your car and operate the engine until the transmission oil pressure reaches 120 degrees to 140 degrees Fahrenheit.

Step 5

Remove the plug and install the pressure gauge in the mainline tap.

Step 6

Place the transmission in forward position and operate the transmission to 600 RPM. The pressure should read 40 to 70 psi.

Step 7

Operate the transmission at 200 RPM, and the pressure should read 130 to 150 psi.

Step 8

Remove the pressure gauge from the mainline tap.

Step 9

Remove the blocks from under the car and lower the car back down to the ground with the car jack.

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