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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.
you probably have 2.73's like they said. crawl under your car and check on the rear end. sometimes there is a metal tag that says what it has in there. I had 3.08's stock on my 94 cobra and changed them for 3.73's. They woke up my car quite a bit. Go with ford motorsport gears. I've heard from a few people that some others will chatter a little. With the 3.73's I run about 2500 rpms at 80 mph. you'll run through the gears much quicker. it takes some getting used to.
stock 5.0 with aod came with 273's, and stock t5 comes with 308's i think........... i got 3.73's in my t5, if i had an auto i'd go 4.11's... but if you do alot of long dist driving, go ATLEAST 3.73's...... thats just my opinion