Been running Dextron since the mid 80's. The trans was in my cuda from 2001-2006. The car was nothing special ran low tens. The trans sat for about 8 yrs when life got in the way. In 2013 took it in to be checked and rebuilt if nec was told other than a few minor adjustments everything was fine. Been running it ever since in my wagon. Its not as fast but is a heavy pig. Nothing but routine fluid changes.