GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Fluid Pan

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REMOVAL & INSTALLATION



See Figure 1

The truck should be driven 15-20 miles to warm the transmission fluid before the pan is removed.

The fluid should be drained while the transmission is warm.

  1. Raise and support the front of vehicle safely using jackstands.
  2.  
  3. Place a drain pan or under the transmission housing a fluid pan.
  4.  
  5. Remove the pan bolts from the front and the sides, then loosen the rear bolts 4 turns.
  6.  

On some vehicles, it may be necessary to support the transmission tailshaft and remove the crossmember just behind the transmission for pan clearance or access to the pan bolts.

  1. Using a small pry bar, carefully pry the pan downward at the front of the transmission. This will allow the pan to partially drain. Remove the remaining pan bolts and lower the pan from the transmission.
  2.  

If the transmission fluid is dark or has a burnt smell, transmission damage is indicated. Have the transmission checked professionally.


CAUTION
If the pan sticks, carefully tap sideways on the pan with a rubber or plastic mallet to break it loose; DO NOT dent the pan.

  1. Empty the transmission pan of the remaining fluid, then remove the gasket material and clean with a solvent.
  2.  
  3. Using a putty knife, carefully clean the gasket mounting surfaces.
  4.  

To install:
  1. Use a new gasket and sealant and install the transmission pan. Install and tighten the retaining bolts to 8 ft. lbs. (11 Nm) using a criss-cross pattern.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Common early model automatic transmission fluid pan bolt/gasket patterns

  1. Remove the jackstands and carefully lower the vehicle.
  2.  
  3. Immediately refill the transmission housing using Dexron® II automatic transmission fluid. Add the fluid through the filler tube. Please refer to the capacities chart found in Chapter 1 of this manual to determine the proper amount of fluid to be added.
  4.  


CAUTION
DO NOT OVERFILL the transmission. Foaming of the fluid and subsequent transmission damage due to slippage will result.

  1. With the gearshift lever in PARK, start the engine and let it idle. DO NOT race the engine.
  2.  
  3. Apply the parking brake and move the gearshift lever through each position. Return the lever to Park and check the fluid level with the engine idling. The level should be between the two dimples on the dipstick, about 1 / 4 in. (6mm) below the ADD mark. Add fluid, if necessary.
  4.  
  5. Check the fluid level after the truck has been driven enough to thoroughly warm the transmission. For more information regarding fluid and level checks, please refer to Chapter 1 of this manual.
  6.  

FILTER SERVICE



  1. Remove the transmission oil pan and drain the fluid. For details, please refer to the procedure located earlier in this section.
  2.  
  3. Remove the screen and the filter from the valve body. Most screens are retained using a bolt fastener, though some may use an interference fit between the screen tube and valve body.
  4.  

To install:
  1. Install a new filter using a new gasket or O-ring.
  2.  

If the transmission uses a filter equipped with a fully exposed screen, it may be cleaned and reused.

  1. Install the transmission oil pan and properly refill the transmission.
  2.  

 
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