RE: Why 75w90 in tranny?
Save the 20w50 and get some amsoil 75w90 or 75w110 severe gear for your trans. Don't worry that 20w50 won't go bad on the shelf. A motor oil in a trans will shear out of grade faster then a gear oil. Plus gear oil will give you better & smoother shifting and quieter operation. I would get the 75w110 myself if you like amsoil.
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 06 FXDLI
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