I have the original sm420 4 speed trans still in my '49. Its behind a 250 inline 6 motor. I've been wanting to swap the trans for one a little better for cruising the highway and get the rpms lower. A buddy of mine has a 3 spd trans out of a '68 chevy pickup I can have pretty cheap but didn't know if it would really be worth doin. I do have a turbo 350 but didn't really care to go auto. If someone that knows about these can help me out that would be great!
