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It is important to maintain the fluid levels in a car, and it is important to put the right type of fluids in the car as well. A 1989 Chevy Pick up uses Dexron III transmission fluid.
regular everyday powersteering fluid will work or you can use a dex III transmission fluid. it will work the same and be cheaper.
10w-30
Motorcraft MERCON automatic transmission fluid is used in the power steering ( according to the 2000 Ford Explorer Owner Guide )
AF
10w30
dexron-mercon
Mopar ATF+4
75W90
DOT3
DEX III Transmission Fluid
Depends on type of car or truck. four wheel drive pickup hard body