Front and rear differential + transfer case fluids

Symptoms

The fix, step by step

1. Warm the drivetrain with a 5–10 mile drive.
2. Always crack the fill plug before the drain.
3. Front diff: 10 mm hex plugs, about 1.6 qt (part-time) or 1.5 qt (full-time) of 75W-85 GL-5; drain 48 ft-lb, fill 29 ft-lb.
4. Rear diff: 24 mm plugs, 36 ft-lb; Trail4R quotes about 2.9 qt with locker / 2.8 qt without, but Toyota-Club's owner's-manual table lists 2.70 L without and 2.65 L with the locker confirm in manual — fill to the bottom of the fill hole either way.
5. Transfer case: 24 mm plugs, 27 ft-lb, about 1.1 qt (part-time) or 1.5 qt (full-time) of Toyota Transfer Gear Oil LF 75W (Red Line MT-LV is the commonly cited alternative).
6. Clean the magnetic drain plugs and use new crush washers.

Tools & part numbers

• 10 mm hex bit
• 24 mm socket
• fluid pump
• torque wrench
• Toyota LT 75W-85 GL-5
• Toyota LF 75W transfer oil
• washers: transfer case 90430-A0003, front drain 90430-24003, front fill 12157-10010

Where to buy the parts

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