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What kind of transmission fluid does 1991 Chevy 2500 5 speed use?

A 1991 Chevy 2500 5-speed uses GL-4 or GL-5 gear oil. The exact specifications may be listed in your owner's manual, but either GL-4 or GL-5 is appropriate. Pay attention to the recommended weight; it's likely a 75W-90 or 80W-90 depending on your climate. Always check your owner's manual for the definitive recommendation.