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Home >> Ford >> 2004 >> Excursion 6.8 S, RWD >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Differentials & Drive Axles >> Driveline System - General Information -- Excursion & F250-F550 Super Duty >> Diagnosis And Testing >> Driveline System >> Component Tests >> Differential Check - Trac-Lok® Road Test (Dana)

Differential Check - Trac-Lok® Road Test (Dana)

  1. Drive the vehicle for at least ten miles to warm up the axle lubricant.
    • More miles may be necessary depending on the outside temperature.
  2. Drive the vehicle in a tight circle for five minutes and then in the opposite direction for another five minutes.
  3. Make a minimum of ten figure-eight turns.
  4. If chatter is still present, drain and refill the axle with the specified type and amount of lubricant and friction modifier. Refer to Specifications .
  5. Carry out the road test again.
    • There might be a slight chatter. If the chatter persists after 160 km (100 miles) of vehicle operation, install a new differential.