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If you will lay down under the front of the truck and look up over the skid plate towards the center of the differential but to the right a little you will see a plug that a 3/8 rachett end will fit in. Remove it and put finger into hole if you touch oil then its full if not add gear oil until it runs out.

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12y ago
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Q: How do you check or add oil to the front differential on a 1989 Chevy k1500?
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