Isuzu Cars and Trucks 1981-1991

Transfer Case

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FLUID RECOMMENDATIONS AND LEVEL CHECK
Manual

The manual transmission/transfer case is a complete unit and the fluid from the transmission lubricates the transfer case. Use engine oil to refill the manual transmission/transfer case. Refer to the "Oil Viscosity" chart in the manual transmission information.

Automatic

The automatic transmission and transfer case are separate units. The level has to be check individually. Use Dexronand#x00AE;II automatic transmission fluid in both units.

Remove the oil filler plug, if no fluid comes out of the hole, fill the transfer case with Dexronand#x00AE;II until the fluid spills out of the hole. Install the plug and torque to 20 ft. lbs. (27 Nm).



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Fig. Transfer case fill plug automatic transmission only

1990 Impulse 4

The manual transaxle and transfer case are separate units. The transfer case fluid is SAE 80W-90 GL-5 gear lubricant. Do NOT use engine oil in this assembly.

To check the lubricant level, remove the filler plug, if no lube comes out of the hole, fill the transfer case with gear lubricant until the lube spills out of the hole. Install the plug and torque to 20 ft. lbs. (27 Nm).



Click image to see an enlarged view

Fig. Transfer case oil drain and fill plug 4x4 Impulse, use SAE 80W-90 gear lube; use engine oil in the transmission

DRAIN AND REFILL
  1. Raise the vehicle and support with jackstands. Place a catch pan under the transfer case.
  2.  
  3. Remove the drain plug at the bottom of the transfer case. Allow the fluid to drain into the pan.
  4.  
  5. Install the drain plug and torque to 20 ft. lbs. (27 Nm).
  6.  
  7. Remove the filler plug and refill the transfer case with engine oil for the transfer case with a manual transmission, Dexronand#x00AE;II for the transfer case with a automatic transmission and SAE 80W-90 GL-5 gear lube for the Impulse transfer case. Install the fill plug and torque to 20 ft. lbs. (26 Nm).
  8.  

 
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