I ran a 68 Mustang with built 289 for years. I had a close ratio ( 2.20 ) 1st with 3.55s, it worked well. Well except 3000 rpm @ 60mph, sucked down the interstate. A
ll my cars have a limited slip, Trac-Loc, Torsen, or some type of non open rear.
Being that the 5th gear ratio is .61, having a...