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The D100 probably has the 3 speed standard transmission. If so, it doesn't use gear oil in the transmission. It uses Dextron II or III. The fill plug is found on the side of the transmission about half way up.

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9y ago
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9y ago

Assuming that the standard transmission in that 88 D100 is a three speed, it uses Dextron II or III. It doesn't use gear oil. The fill plug is on the side of the transmission about half way up.

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Q: Where do you put gear oil in a manual transmission on 1988 d100 truck?
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