FLUID LEVEL CHECK
See Figures 1, 2 and 3
Fluid should be maintained at the level of the filler plug hole. When you check the level, make sure that the vehicle is level so that you get a true reading. When you remove the filler plug, the lubricant should run out of the hole. If there is lubricant present at the hole, you know that the case is filled to the proper level. Replace the plug quickly for a minimum loss of lubricant. If lubricant does not run out of the hole when the plug is removed, lubricant should be added until it does. Replace the plug as soon as the lubricant reaches the level of the hole.
FLUID CHANGE Manual Transfer Case
All manual transfer cases are to be serviced at the same time and in the same manner as the manual transmissions. The transfer case has its own drain plug which should be opened; do not rely on the transmission drain plug to completely drain the transfer case, even if they are interconnected. Once the transfer case has been drained, replace the drain plug, remove the fill plug and fill the transfer case. The Dana/Spicer 18, 20 and 21 used SAE 80W-90 gear oil. The NP-208 through 1981 uses SAE 10W-30 engine oil. The NP-208 for 1982 and later uses Dexron®II automatic transmission fluid. The NP-207 and 228 also use Dexron®II. Replace the fill plug.
Full Time Transfer Case1973-79 MODELS
See Figure 4
Lubricant levels in the transfer case and low range reduction unit should be checked every 5,000 miles. Every 30,000 miles, the fluid in both units should be changed.
When checking the fluid levels, remove the filler plugs and add sufficient lubricant to bring the level up to the opening. Only Jeep Quadra-Trac® lubricant should be used. Allow all excess lubricant to run out of the hole before replacing the plug.
When changing the lubricant, remove the filler plugs from both the transfer case and the reduction unit. Remove the transfer case drain plug and, after it has completely drained, install the drain plug. Loosen the five bolts on the reduction unit housing (the reduction unit has no drain plug), so that the unit can be pulled far enough for drainage. After it has completely drained, position the unit and tighten the bolts to 10-20 ft. lb. Add one pint of Quadra-Trac® lubricant only, to the reduction unit. Install the filler plug. Fill the transfer case to the filler hole level with Quadra-Trac® lubricant only. Allow excess lubricant to run out the hole. Install the filler plug.
After changing the fluid, it may be necessary to drive the vehicle in figure 8s for about fifteen minutes to allow fresh lubricant to enter the differential unit and force the clutches to operate.
See Figure 5
Check the fluid level through the filler hole on the side of the case. The fluid should be level with the hole. No periodic drain interval is recommended for these units. When operating under severe conditions, on a regular basis, change the fluid yearly. When operating in deep water for an extended period, change the fluid as often as necessary.
The following is a list of fluids to be used:
1980-81 219: SAE 10W-30 engine oil
1982 219: Dexron®II ATF
1983-84 229: Dexron®II ATF