GM Full-Size Trucks 1988-1998 Repair Information

Transfer Case

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FLUID RECOMMENDATIONS



Use Dexron ll® or its superseding fluid type on models through 1994. On 1995-98 models, use Dexron lll® or its superseding fluid.

FLUID LEVEL CHECK



See Figure 1

Check the four wheel drive transfer case lubricant at least twice a year.

  1. With the truck parked on a level surface, remove the filler plug from the rear of the transfer case (behind the transmission). Be careful not to take out the drain plug at the bottom.
  2.  
  3. If lubricant trickles out, there is enough. If not, carefully insert a finger and check that the level is up to the edge of the hole, EXCEPT in full time four wheel drive cases which should be 1 / 2 in. (13mm) below the hole.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Check the transfer case fluid level with your finger

  1. Lubricant may be added, if necessary, with a funnel and tube, or a squeeze bulb.
  2.  
  3. Tighten the plug to 18 ft. lbs. (25 Nm).
  4.  

DRAIN AND REFILL



  1. With the transfer case warmed up, park on a level surface.
  2.  
  3. Slide a pan of a least 6 pts. capacity under the case drain plug.
  4.  
  5. Remove the filler plug from the rear of the transfer case (behind the transmission). Remove the drain plug from the bottom.
  6.  
  7. Wipe the area clean and install the drain plug.
  8.  
  9. Add lubricant with a suction gun or squeeze bulb.
  10.  
  11. When the lubricant level is up to the bottom of the filler hole, install the plug and tighten it to specifications.

    4401 and 4470 models: 18 ft. lbs. (25 Nm).
     
    NV241 and NV243 models: 35 ft. lbs. (47 Nm).
     

  12.  

 
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