Jeep CJ/Scrambler 1971-1986 Repair Guide

Pan Removal and Fluid Change

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Chrysler 904 and 999

  1. Raise and support the truck on jackstands.
  2.  
  3. The pan has no drain plug, so remove the bolts at one corner and loosen the other pan bolts so that the fluid drains neatly from the one, low hanging corner.
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  5. Remove the remaining bolts and remove the pan. Discard the gasket.
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  7. Unbolt and remove the filter from the valve body.
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  9. Install the new filter and torque the bolts to 35 inch lbs.
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  11. Coat a new pan gasket with sealer and install the pan. Torque the bolts to 150 inch lbs. (12 ft. lbs.). Fill the transmission.
  12.  

Turbo Hydra-Matic 400

Since the Turbo Hydra-Matic transmission doesn't have a drain plug, the fluid is drained by loosening the pan and allowing the fluid to run out over the top of the pan.

To avoid making a really big mess, place a drain pan under one corner of the transmission pan and remove the two attaching screws nearest to either side of that particular corner. One by one, and in a progressive manner, loosen all of the other attaching screws holding the transmission pan, leaving the ones farthest away from the drain corner tighter than the rest. When the majority of the fluid has drained, hold the pan up with one hand, remove the remaining attaching screws and carefully lower the pan. There will be some automatic transmission fluid left in the pan, so be careful not to spill any. The filter is located directly under the oil pan.

There are filter replacement kits available for changing the transmission fluid filter. The kit includes a new filter, pan gasket and, in most cases, a new rubber O-ring to seal the intake pipe. If a new O-ring is not provided, leave the old one in place. If you can see that the old O-ring is cracked or damaged in any way, it is necessary to replace it with a new one, which can be obtained at a Jeep or GM dealer.

  1. Remove the oil filter retainer bolt and remove the oil filter assembly from the transmission.
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  3. Remove the intake pipe from the filter and the intake pipe-to-case O-ring, if it is to be replaced.
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  5. Coat the new rubber O-ring with transmission fluid and position it in the groove at the inlet opening.
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  7. Slide the inlet pipe onto the new filter and position the filter on the transmission, guiding the inlet pipe in place.
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  9. Install the filter retaining bolt and tighten securely.
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  11. Clean the pan in a suitable solvent and wipe it dry with a clean, lint-free cloth.
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  13. Install the pan in the reverse order of removal using a new pan-to-transmission gasket and torquing the bolts in an alternating pattern to 10-13 ft. lbs.
  14.  

 
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