I had a TH-400 built for my drag car a few years back and the guy told me to put in a 50/50 mixture of Dextron VI (synthetic) trans fluid and Mobile one engine oil, can't remember the viscosity of the Mobil One he recommended. And I ran what he said and never had any problems with the trans until I broke the bell housing off on launch. I since have cut off what was left of the bell housing and installed a super bell. Still running it.
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Tim Corcoran
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