Hi?I was hoping to get some opinions from you all when it comes to Muncie transmissions and rear end gear ratios. I am building a 67 RS Camaro to take to cruise nights and drive around town on the weekends. I am putting in a big block with a Muncie M21. I was told that the trans would not be a good street trans unless I went with steep gears in the rear. I know the M21 and M22 have the same gear ratios and the M20 has steeper gears. I was told that the M20 was better for the street cause of the steeper gears, but others told me it wasn't as strong a trans as the M21. My question is this..Can someone tell me if I use 3.90 gears in the posi rear with my M21, and a big block, is that a good combo? I will need to ride the car down to the Jersey shore which is about an hour away. Will the RPM's be killing me with
3.90's driving on the highway for about an hour (60mph)? Am I better off with 3.73's or are they going to be to whimpy for takeoff. I don't plan to race this car but want to be proud of its performance and kick some import with a big mufflers ass if needed :) Would I be better off with an M20 and 3.73's or what? Is the M20 just as strong as the M21? I know the M22 is the strongest of all. I'm just looking for the best combo for street racing and some highway crusin to get to a show. I am putting in a 454 that's going to be about 450hp and have good torque in the lower rpm range. Any advice from anyone who has experience with this setup would be deeply appreciated.!!!Thanks Gary