75w-90 or 85w-140?

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Mar 10, 2003 | 11:32 AM
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Which is best for a 9 bolt with a 3.70 posi that will be ran at the track 5-10 times a month May-October? This will be Royal Purple gear oil.
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Tags 75w90, 85w140, a4, difference, fbody, purple, royal, tranns
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