89 used a 7 tooth drive gear. For 3.73, you need a 21 tooth driven gear. I find that dealers are completely useless if something is not stock, and find it easier to know what I need instead of having them look it up. The chart is right in my FRPP catalog, he should have no problem finding it in his books. But anyway, if a 5 speed, red gear part #C4OZ-A. If it's an auto, purple, part #D0OZ-B.
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