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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Tremec does recommend synchromesh for their trannies, but the T5 is the same as the WC borg warner tranny, which uses ATF. Their other trannys are more heavy duty and the synchromesh benefits them more.