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Chevrolet Silverado / GMC Sierra. Manual - part 1025
2. Remove the fill cap (9) on the J 35944-A and fill the flusher tank (4) with 0. See Special
Tools.6 L (20-21 oz) of J 35944-22 , using the measuring cup (6). See Special Tools. Do
not overfill.
3. Install the fill cap (9) on the J 35944-A and pressurize the flusher tank (4) to 550-700 kPa
(80-100 psi), using the shop air supply at the tank air valve (2). See Special Tools.
4. With the water supply valve (1) on the J 35944-A in the OFF position, connect the water
supply hose from the J 35944-A to the water supply at the faucet. See Special Tools.
5. Turn ON the water supply at the faucet.
BACK FLUSH
1. Inspect the transmission oil cooler pipes for kinks or damage. Repair as necessary.
approved fluids for cooler flushing can have an adverse
reaction to the seals inside the transmission.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 24: Connecting J 35944 To Oil Cooler
Courtesy of GENERAL MOTORS CORP.
2. Connect the J 35944-A to the oil cooler feed bottom connector. See Special Tools. Use the
J 35944-200 , if required. See Special Tools.
3. Clip the discharge hose (2) onto the oil drain container.
4. Attach the J 35944-A to the undercarriage of the vehicle with the hook provided and
connect the flushing system feed supply hose (1) from the J 35944-A to the top connector
oil cooler return pipe. See Special Tools. Use the J 35944-200 , if required. See Special
Tools.
5. Turn the J 35944-A water supply valve (3) to the ON position and allow water to flow
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
through the oil cooler and pipes for 10 seconds to remove any remaining transmission fluid.
See Special Tools. If water does not flow through the oil cooler and pipes, the cause of the
blockage must be diagnosed and the plugged component must be repaired or replaced.
Continue with the cooler flushing and flow check procedure once the blockage is corrected.
6. Turn the J 35944-A water supply valve (3) to the OFF position and clip the discharge hose
onto a 19 liter (5 gallon) pail with a lid, to avoid splashback. See Special Tools.
Fig. 25: J 35944-A Water Supply Valve ON/OFF Positions
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Flushing for approximately 2 minutes in each cooler line
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
7. Turn the J 35944-A water supply valve (3) to the ON position and depress the trigger (1) to
mix cooler flushing solution into the water flow. See Special Tools. Use the clip provided
on the handle to hold the trigger (1) down. The discharge will foam vigorously when the
solution is introduced into the water stream.
8. Flush the oil cooler and pipes with water and solution for 2 minutes. During this flush,
attach the shop air supply 825 kPa (120 psi) to the flushing system feed air valve (2) located
on the J 35944-A , for 3-5 seconds at the end of every 15-20 second interval to create a
surging action. See Special Tools.
9. Release the trigger (1) and turn the J 35944-A water supply valve (3) to the OFF position.
See Special Tools.
FORWARD FLUSH
direction will result in a total of about 30-38 L (8-10 gallons)
of waste fluid. This mixture of water and flushing fluid is to
be captured in a bucket or similar container.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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