Hy Maddoggee1959, this subject is quite a can of worms to discuss,I agree that an overdrive would be the most desirable with todays gas prices. That leaves the 700R4 with mechanical control, or the 4L60E, 4L65E, or the 4L80E with computer control (stand alone controls can be purchased for the "E" series transmissions). None of these transmissions would allow the factory rear engine mount to be used, and the front engine mounts should be changed to use the side mounts which would mean some fabrication, either an aftermarket frame crossmember with the mount bosses incorporated into it or individual mounts projecting from either frame out towards the engine. You would also have to install an aftermarket crossmember to support the rear of the transmission and possibly remove some or all of the factory engine rear crossmember. You could also look for a factory Dual-Range Hydramatic and install an independent overdrive unit such as a Gear Venders. I hope that gives you some food for thought.
