If you do not have a bottle pump, add about $10. $56 (Using mid-priced Mobil 1 synthetic gear oil. NOTE: Do not attempt to overfill the differentials, as doing so may force excess fluid out of the axle’s breather tube. Replace the fill plug, tightening to 25-30 ft. ![]() If you have stock differential covers like Smokey, you’ll know the differential is full when fluid begins to overflow the fill port. If your pump will not completely empty the bottle, it may be necessary to transition to a second bottle, eventually pouring the remains of the first bottle into the second. Attach the pump to the bottle of gear oil and route the length of hose into a secure location inside the fill port. Replace the cleaned drain plug and tighten to about 25-30 ft. If noticeably larger shavings are present, consider removing the differential cover to give your gears a thorough visual inspection. ![]() The magnetic drain plug catches tiny metallic filings floating in the fluid. Use a couple of shop towels to wipe clean the drain plug, which will be covered with a gritty, dark grey mass. Allow the fluid to completely drain before proceeding. Repeat the process for the drain bolt, located on the bottom right side of each differential. Turn counter-clockwise to loosen and remove the bolt. Attach the ratchet extension to the 3/8-inch ratchet and insert the head of the extension into the bolt hole on the front of the differential cover. Place the drain pan below your differential. Based on Internet research, it appears there’s several tenths of a quart difference from Jeep to Jeep. Even with Smokey’s stock covers in place, I found these figures to be completely unrealistic, as fluid was pouring out of the fill holes at the capacities listed in the bulleted list above this paragraph. The engine should be running at curb idle speed for a minimum of 60 seconds. To check the automatic transmission fluid level properly, the following procedure must be used: 1. ![]() Jeep claims the differentials, as listed above, will hold 1.2, 1.4 and 2.4 quarts, respectively. Operation of the transmission with an improper fluid level will greatly reduce the life of the transmission and of the fluid. Four quarts, 80W90 gear oil (A full-synthetic 75W90 is an acceptable substitute and contains the friction modifier that otherwise would have to be added to the limited-slip rear differential.There was no evidence my breather tubes had become dislodged, allowing in the muck, but, at less than $60, the necessary four quarts of gear oil were simply cheap insurance. (Here’s a helpful hint: Unless your vehicle only leaves the garage for a weekly Sunday afternoon drive around the block, you should be following the heavy-use schedule.) Based on that schedule, I was more than 15,000 miles overdue for this maintenance and wanted to get it done in advance of a planned summer highway trip.Īfter a recent unplanned venture into some deep mud, I decided to be safe rather than sorry. According to Jeep, the gear oil in Smokey’s front and rear differentials should be changed about every 15,000 miles, based on the “heavy driving” maintenance schedule.
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