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What weight of gear oil goes in a 1989 Jeep Wrangler?

The weight of gear oil for a 1989 Jeep Wrangler depends on which differentials you have (front and rear) and the specific axle ratio. There's no single answer.

You must consult your owner's manual or a Jeep Wrangler repair manual specific to the 1989 model year. This manual will list the correct weight and capacity for your specific axles.

Trying to use the wrong weight oil can severely damage your differentials.