Pressure Test Port Locations

Only two pressure ports are supplied on the transmission case. The torque converter clutch apply and release ports are located on the right side of the transmission case. See Fig 1.

Fig 1: Torque Converter Pressure Locations

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To determine the line pressure, there are two available methods. The DRB® scan tool can be used to read line pressure from the line pressure sensor. The second method is to install Line Pressure Adapter 8259 into the transmission case and then install the pressure gauge and the original sensor into the adapter. This will allow a comparison of the DRB® readings and the gauge reading to determine the accuracy of the line pressure sensor. The DRB® line pressure reading should match the gauge reading within +/-10 psi. See Fig 3.

In order to access any other pressure tap locations, the transmission oil pan must be removed, the pressure port plugs removed and Valve Body Pressure Tap Adapter 8258-A installed. The extensions supplied with Adapter 8258-A will allow the installation of pressure gauges to the valve body. Refer to Fig 4 and Fig 2 for correct pressure tap location identification.

Fig 2: Pressure Tap Locations

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Fig 3: Line Pressure Adapter 8259

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Fig 4: Valve Body Pressure Tap Adapter 8258-A

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