Discussion Starter · #1 ·
Getting ready to R&R the 12 bolt for my '71 SS the original set up is a 2:73 open rear. I've decided to use an Eaton posi carrier, but havent nailed down which ratio i want to go with yet. i am considering either 3:42 or a 3:55 ratio. The motor and trans are a little warmer than stock '71 402 w/ a TH400. I would like a good performer to play with on the street but dont want to wind the BB high in the RPM's when going 70-75 on the highway like a 3:73 does. What gear would you go with?