FLUID LEVEL CHECK
The fluid level in automatic transmissions is checked with a dipstick which is located in the filler pipe at the right rear of the engine. The fluid level should be maintained between the ADD and FULL marks on the end of the dipstick with the automatic transmission fluid at normal operating temperatures. To raise the level from the ADD mark to the FULL mark, requires the addition of one pint of fluid. The fluid level with the fluid at room temperature (75ºF) should be approximately 1 / 4 in. below the ADD mark.
See Figures 1 and 2
In checking the automatic transmission fluid, insert the dipstick in the filler tube with the markings toward the center of the truck. Also, remember that the FULL mark on the dipstick is the indication of the level of the automatic transmission fluid when it is at operating temperature. This temperature is only obtained after at least 15 miles of expressway driving or the equivalent of city driving.
To check the automatic transmission fluid level, follow the procedure given below. This procedure is applicable either when the fluid is at room temperature or at operating temperature.
- With the transmission in Park, the engine running at idle speed, the foot brake applied and the vehicle resting on level ground, move the transmission gear selector through each of the gear positions, including Reverse, allowing time for the transmission to engage. Return the shift selector to the Park position and apply the parking brake. Do not turn the engine off, but leave it running at idle speed.
- Clean all dirt from around the transmission dipstick cap and the end of the filler tube.
- Pull the dipstick out of the tube, wipe it off with a clean cloth, and push it back into the tube all the way, making sure that it seats completely.
- Pull the dipstick out of the tube again and read the level of the fluid on the stick. The level should be between the ADD and FULL marks. Do not overfill the transmission because this will cause foaming and loss of fluid through the vent and malfunctioning of the transmission. Use only DEXRON®II transmission fluid.
FLUID AND FILTER CHANGE
See Figures 3 through 10
The transmission fluid in an automatic transmission should be changed every 24,000 miles of normal driving or every 12,000 miles of driving under abnormal or severe conditions. 1962-69 models, using the Warner AS-8F use Type A fluid. All other models use Dexron®II fluid. The fluid should be drained immediately after the vehicle has been driven for at least 20 minutes at expressway speeds or the equivalent of city driving, before it has had the chance to cool. Follow the procedure given below:
- Drain the automatic transmission fluid from the transmission into an appropriate container, by removing the transmission bottom pan screws, pan and gasket.
- Remove the oil strainer and discard it.
- Remove the O-ring seal from the pickup pipe and discard it.
- Install a new O-ring seal on the pickup pipe and install the new oil strainer and pipe assembly.
- Thoroughly clean the bottom pan and position a new gasket on the pan mating surface. Install the bottom pan and secure it with the attaching screws, torqued to 10-13 ft. lb.
- Pour about 4 quarts of automatic transmission fluid in the filler pipe. Make sure that the funnel, container, hose or any other item used to assist in filling the transmission is clean.
- Start the engine. Do not race it. Allow the engine to idle for a few minutes.
- Place the selector lever in Park and apply the parking brake. With the transmission fluid at operating temperatures, check the fluid level; add fluid to bring the level to the full mark.