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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.
my buddies 89 5.0 the trans slips really bad when cold u have to rev to 2300 rpm bfore it will start to move and then will slip when u get on it any ideas
The automatic trans fluid should be a pink color and not brown. A slipping trans is not a good thing, obviously. Luckily, AOD's are a dime a dozen and cheap too.
Change the fluid and filter. If that does not cure the problem, reuse it. But it seems the transmission is starting to slip bad. When mine started slipping I wasted no time and threw it out.