GM Cadillac 1967-1989 Repair Guide

Fluid Pan

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See Figure 1

The seven types of pan gaskets on the automatic transmissions/transaxles covered here are pictured in this section for ready identification.



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Fig. Fig. 1: Automatic transmission pan identification

REMOVAL & INSTALLATION (FLUID AND FILTER CHANGE)



See Figures 2 through 12

The fluid should be changed with the transmission warm. A 20 minute drive at highway speeds should accomplish this.

  1. Raise and support the vehicle, preferably in a level attitude.
  2.  
  3. If the crossmember prevents removal of the pan, support the transmission and remove the support crossmember.
  4.  
  5. Place a large pan under the transmission pan. Remove all the front and side pan bolts. Loosen the rear bolts about four turns.
  6.  
  7. Pry the pan loose and let it drain.
  8.  
  9. Remove the pan and gasket. Clean the pan thoroughly with solvent and air dry it. Be very careful not to get any lint from rags in the pan.
  10.  

It is normal to find a SMALL amount of metal shavings in the pan. An excessive amount of metal shavings indicates transmission damage.

  1. Remove the strainer to valve body screws, the strainer, and the gasket. Most 350 transmissions will have a throw-away filter instead of a strainer. On the 325, 400 and 425 transmissions, remove the filter retaining bolt, filter, and intake pipe O-ring.
  2.  

To install:
  1. If there is a strainer, clean it in solvent and air dry.
  2.  
  3. Install the new filter or cleaned strainer with a new gasket. Tighten the screws to 12 ft. lbs. (16 Nm). On the 325, 400 and 425, install a new intake pipe O-ring and a new filter, tightening the retaining bolt to 10 ft. lbs. (14 Nm).
  4.  
  5. Install the pan with a new gasket. Tighten the bolts evenly to 12 ft. lbs. (16 Nm) on most models except the 440-T4 which should be 10 ft. lbs. (14 Nm).
  6.  
  7. Lower the car and add the proper amount of DEXRON®II automatic transmission fluid through the dipstick tube.
  8.  
  9. Start the engine in Park and let it idle. Do not race the engine. Shift into each shift lever position, shift back into Park, and check the fluid level on the dipstick. The level should be 1 / 4 in. below ADD . Be very careful not to overfill. Recheck the level after the car has been driven long enough to thoroughly warm up the transmission. Add fluid as necessary. The level should then be at FULL .
  10.  



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Fig. Fig. 2: Removing the pan on the automatic transmission



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Fig. Fig. 3: Always replace the gasket when installing the pan



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Fig. Fig. 4: Removing the filter and gasket on a Turbo Hydra-Matic 200 or 350



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Fig. Fig. 5: Removing the filter, intake pipe and O-ring on a Turbo Hydra-Matic 325, 400 or 425



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Fig. Fig. 6: Oil pan and filter on the 1986 Eldorado and Seville (440-T4)



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Fig. Fig. 7: Removing all necessary bracket bolts for transmission oil pan removal



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Fig. Fig. 8: Removing all necessary brackets for transmission oil pan



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Fig. Fig. 9: Removing transmission oil pan



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Fig. Fig. 10: Removing the gasket from the transmission oil pan



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Fig. Fig. 11: Removing transmission filter retaining bracket



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Fig. Fig. 12: Removing transmission oil filter

 
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