I went with 80/90 API/GL5 Plus, Limited Slip (not synthetic) for my Pantera. But I have a Maserati Biturbo also, and my mechanic said alot of guys were putting redline synthetic fluid in their trans, which makes the shifting much smoother, but tends to leak more. From my experience in doing this on my Maserati, both of his comments were very true. I am now back to the regular stuff, just because I don't like the constant leaking on the driveway...but shifting is sure enough stiffer again.
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