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Automatic? Read the information on the transmission dip stick, it will tell you what type of fluid to use. Standard? Use Mercon.
Dextron-II
Dextron II--ATF
R134a
dot3
Dextron II fluid.
You can use ATF (automatic transmission fluid)
R-134a
Any DOT 3 fluid. Brand makes no difference.
the transmission fluid for your truck is dex/merc
Dextron III
DOT 3