If the overdrive transmission is in good shape, its well worth the money. It will cut your rpm's by 30 % in high gear when its in overdrive. With overdrive locked out, you will have a 3 speed like what you have now. If you are still running 6 volt, I don't think Chev ever offered a 6 volt overdrive, but you can use a relay and solenoid from a 55 or older Ford. Overdrive was a popular option with Ford, and the Warner tail section is the same Borg Warner as what GM used. Most of the parts of the 3 speed you have now will interchange with the front section overdrive transmission. I have been running Ford overdrives for over 45 years and am in the process of putting one in a 1950 GMC. I like an overdrive much better than re ratioing the rear to 3.55.
Last edited by crenwelge; 01/24/2010 6:18 AM.
