What transmission fluid should I use in an 1985 Buick Riviera?

Wondered why it just sucked at driving. New gas, full of oil. Sat for a year, thought the oil leaked, but it's full... Tranny seal is bad now, wWhat tranny fluid should I use in it? 5.0L V8 Riviera, Auto Transmission.What transmission fluid should I use in an 1985 Buick Riviera?You vehicle takes Dexron III / MerconWhat transmission fluid should I use in an 1985 Buick Riviera?Offering used and remanufactured automatic transmissions at discounted rate. Our transmissions come with up to 3 years warranty and low price guarantee. Buy used automatic transmission directly from the auto salvage yards that dismantled the wrecked automobile after theWhat transmission fluid should I use in an 1985 Buick Riviera?Check your vehicle manual. Then go to autozone and ask them.