I know that Dynamic makes good valve bodies and other components. Right now my buddy has a Regular C-4 with a Dynamic valve body with a Coan converter.
I think Performance Automatic makes a pretty good C-4 also. There is a company with a lifetime warranty. All you pay is shipping to get it rebuilt.
Talk to those who are running C-4's around you and find out who has a good transmission shop around your area.
Jason
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