[QUOTE= Here's my answer: (And I'm not saying this is the best answer, or even the right answer, but it is my answer.) Lucas conventional 20W50 in the oil tank, RedLine Shockproof in the trans. Whatever cheapo ATF you can find in the primary.[/QUOTE]

Yep Shockproof, ATF but ran straight 50 conv oil in the 89". Run Redline synthetic 20w50 in the big cube because it produces more heat and feel synthetic holds up better, does it hold up better, hell I don't know?