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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.
check your driveshaft. after i put in my new tranny the 4 bolts in the back worked their way loose. shifter started shaking really bad at higher speeds and rpms
Grab the back of your driveshaft, if it has much play then it is probably your pinion gear (need to tighten pinion bolt). My other fox did the same as yours, my shifter would vibrate violently. It turns out that i needed to tighten my pinion bolt and replace my inner tie rods. Not really sure which one was causing prob. because it did both at same time. To check you tie rods jack front of car and grab your wheels @ 9 and 3 and see how much play you have, a little is too much. But after doing both of these, the car drove 10000% better.