Chrysler Full-Size Trucks 1967-1988 Repair Guide

Automatic Transmission

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FLUID RECOMMENDATIONS



All Automatic Transmissions, use ATF+.

LEVEL CHECK



See Figure 1

It is very important to maintain the proper fluid level in an automatic transmission. If the level is either too high or too low, poor shifting operation and internal damage are likely to occur. For this reason a regular check of the fluid level is essential.



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Fig. Fig. 1: Automatic transmission dipstick markings

  1. Drive the vehicle for 15-20 minutes to allow the transmission to reach operating temperature.
  2.  
  3. Park the truck on a level surface, apply the parking brake and leave the engine idling. Shift the transmission and engage each gear, then place the gear selector in P (PARK).
  4.  
  5. Wipe away any dirt in the area of the transmission dipstick to prevent it from falling into the filler tube. Withdraw the dipstick, wipe it with a clean, lint-free rag and reinsert it until it seats.
  6.  
  7. Withdraw the dipstick and note the fluid level. It should be between the upper (FULL) mark and the lower (ADD) mark.
  8.  
  9. If the level is below the lower mark, use a funnel and add fluid in small quantities through the dipstick filler neck. Keep the engine running while adding fluid and check the level after each small amount. Do not overfill.
  10.  

DRAIN AND REFILL



See Figures 2, 3, 4 and 5

A running production change was made in January of 1977 which eliminated the converter drain plug from the automatic transmission. This means that the transmission must be removed in order to drain the converter on models manufactured after this date.



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Fig. Fig. 2: Automatic Transmission torque converter drain plug



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Fig. Fig. 3: Loosen, but do not remove the pan attaching bolts



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Fig. Fig. 4: Remove the filter attaching screws



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Fig. Fig. 5: Clean the pan with a suitable solvent and a rag-but be sure it is completely dry before installation

With Converter Drain Plug

See Figures 6 through 12

  1. Jack up the front of the vehicle and support it on jackstands.
  2.  
  3. Remove the converter access plate and turn the converter using the starter, until the converter drain plug is accessible.
  4.  
  5. Remove the converter drain plug and allow it to drain completely. Late 1972 and 1973-77 models use a 5 / 16 in. (8mm) hex head bolt, instead of the previously used 7 / 16 in. (11mm). A six-point socket must be used in the 5 / 16 in. (8mm) head.
  6.  
  7. Reinstall the converter drain plug.
  8.  
  9. Remove the bolts securing the transmission pan and carefully remove the pan to drain the fluid.
  10.  
  11. Clean the transmission pan thoroughly.
  12.  



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Fig. Fig. 6: The automatic transmission pan must be removed for access to the filter

  1. Remove the screws from the fluid filter in the bottom of the valve body; remove the filter and discard it.
  2.  



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Fig. Fig. 7: Remove old filter

  1. Install a new filter using the screws.
  2.  



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Fig. Fig. 8: Install new filter with screws



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Fig. Fig. 9: Remove all traces of the old gasket from the transmission fluid pan

  1. Install the pan using a new gasket. Tighten the pan screws to 150 inch lbs. (17 Nm) of torque in a criss-cross pattern.
  2.  



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Fig. Fig. 10: Position a new gasket before installation

  1. Install the torque converter access plate.
  2.  
  3. Carefully remove the jackstands and lower the vehicle, then immediately (so as not to forget) pour 6 quarts of ATF+3 automatic transmission fluid through the filler tube.
  4.  
  5. Start the engine.
  6.  
  7. Let the engine idle for 2 minutes and move the gear selector through all the drive positions, pausing momentarily in each position.
  8.  
  9. Leave the gear selector in Neutral (making sure the parking brake is firmly set) and check the fluid level. If necessary, add enough fluid to bring the level to the "ADD ONE PINT'' mark on the dipstick.
  10.  
  11. Test drive the vehicle to warm the fluid to normal operating temperature, then re-check the fluid level. Add fluid as necessary to properly fill the transmission to the upper (FULL) mark on the dipstick.
  12.  



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Fig. Fig. 11: Fill the transmission with a funnel through the transmission dipstick


WARNING
Do not overfill the transmission!



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Fig. Fig. 12: Carefully refill the transmission through the dipstick-proceed slowly and DO NOT overfill

  1. When you are finished, make sure the dipstick is fully seated.
  2.  

Without Drain Plug
  1. Raise the front of the truck and support it on jackstands. Place a large drain pan under the transmission.
  2.  
  3. Loosen the pan attaching bolts and tap the pan at one corner to break it loose.
  4.  
  5. Allow the fluid to drain into the drain pan.
  6.  
  7. Loosen the pan attaching bolts, then tap the pan at one corner to break it loose.
  8.  
  9. Allow the fluid to drain into the drain pan.
  10.  
  11. After most of the fluid has drained, carefully remove the attaching bolts, lower the pan and drain the rest of the fluid.
  12.  
  13. Remove the filter attaching screws and remove the filter.
  14.  
  15. Install a new filter. Tighten the screws to 35 inch lbs. (4 Nm).
  16.  
  17. Thoroughly clean the fluid pan with safe solvent and allow it to dry.
  18.  
  19. Using a new gasket, install the pan to the transmission. Tighten the attaching bolts to 150 inch lbs. (17 Nm).
  20.  
  21. Pour 4 quarts of ATF+3 automatic transmission fluid in through the dipstick tube.
  22.  
  23. Lower the vehicle, start the engine and allow it to run for a few minutes. With the parking brake set, slowly move the gear selector to each position. Return it to the Neutral position.
  24.  
  25. Check the fluid level. Add more fluid as necessary to bring it up to the "ADD ONE PINT'' level.
  26.  
  27. Drive the truck to bring the fluid up to normal operating temperature. Check the level again. It should be between the "Add'' and "Full'' marks.
  28.  

 
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