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what's the recommended type; ATF3 or ATF6?
Of the 4 engine types and transmission options I see listed for your truck I see Dexron 3 listed as the fluid type with a note "look for approved for H specification" on the label.
Q&A > Chevrolet > 1999 Chevrolet Silverado 1500
Q&A > Chevrolet > 2004 Chevrolet Silverado 1500