GM Chevy Mid-Size Cars 1964-1988 Repair Guide

Fluid Pan and Filter

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5 and 6

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 safely using jackstands.
  2.  
  3. If equipped with the Turbo Hydra-Matic 250 or 350, support the transmission and remove the rear 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.  



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Fig. Fig. 1: Most of the vehicles covered by this guide so not have an automatic transmission fluid drain plug



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Fig. Fig. 2: Once the pan is removed and the fluid has been drained, loosen the filter retainers

  1. Carefully pry the pan loose and allow most of the fluid to drain.
  2.  
  3. Support the pan and remove the remaining bolts, then carefully lower the pan from the transmission. The pan will still have a fair amount of fluid, so keep it level as is is lowered. Remove the gasket. Clean the pan thoroughly with solvent and air dry it. Be very careful not to get any lint from rags in the pan.
  4.  
  5. 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 400 transmission, remove the filter retaining bolt, filter, and intake pipe O-ring.
  6.  
  7. If there is a strainer, clean it in solvent and allow it to air dry.
  8.  

To install:
  1. Install the new filter or cleaned strainer, as applicable, using a new gasket. Tighten the retaining screws to 12 ft. lbs. (16 Nm). On the 400, install a new intake pipe O-ring and a new filter, tightening the retaining bolt to 10 ft. lbs. (14 Nm).
  2.  
  3. Install the pan using a new gasket. Tighten the bolts evenly to 12 ft. lbs. (16 Nm) for most transmissions or to 8 ft. lbs. (11 Nm) for Powerglide and Torque Drive.
  4.  



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Fig. Fig. 3: Remove the filter retainers



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Fig. Fig. 4: With the retainers removed, the filter and gasket may be removed from the transmission

  1. Remove the jackstands and carefully lower the vehicle. Immediately add the proper amount of DEXRON®II automatic transmission fluid through the dipstick tube.
  2.  

Refer to Routine Maintenance of this information for more details concerning proper fluid level.

  1. 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 (NOT above) FULL.
  2.  



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Fig. Fig. 5: Removing the filter from the Turbo 350



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Fig. Fig. 6: Remove the filter, intake pipe and O-ring on the 400 (note that the perspective is from a workstand)

 
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