GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Transfer Case Output Shaft Seal

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REMOVAL & INSTALLATION



See Figure 1



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Fig. Fig. 1: Install the shaft seal using a suitable installation tool or driver-NV231 and NV233 shown

  1. Raise and support the vehicle safely using jackstands.
  2.  
  3. Matchmark and remove the front or rear driveshaft, as applicable.
  4.  
  5. For front shaft seal on vehicles applicable, remove the shaft yoke nut and washers, then remove the yoke and shield for access to the seal.
  6.  
  7. For front shaft seal removal on models with the BW4472 transfer case, remove the flange nut, washers, then remove the output flange for access to the seal.
  8.  
  9. Pry out the old seal using a small suitable prytool. Be careful not to damage the seal bore.
  10.  

To install:
  1. Lubricate the lips of the new seal using automatic transmission fluid or petroleum jelly, whichever is at hand.
  2.  
  3. On models with the BW4472 transfer case, align the water hole in the rear output shaft oil seal with the drain hole in the extension housing, then using seal driver J-37668 or its equivalent, install the seal.
  4.  
  5. On all other models, position the seal and carefully drive it into position using a suitable seal installer tool.
  6.  
  7. As applicable, install the shield and shaft yoke, then install the washers and yoke nut. On 1994 vehicles, tighten the nut to 110 ft. lbs. (149 Nm). On 1995-99 vehicles, tighten the flange nut to 80 ft. lbs. (108 Nm).
  8.  
  9. Align and install the driveshaft to the vehicle.
  10.  
  11. Remove the jackstands and carefully lower the vehicle.
  12.  

 
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