There was a write up about putting the OD on the Saginaw 4 speed in Hot Rod Magazine in May of '70 I think. At any rate common knowledge for decades. You don't really drive a 3 speed OD like a 6 speed, though you can, you just pay attention and use the options, one of which is OD above the 1-1 of Saginaw and Muncie 4 speeds in 4th. There were various 3 speed ratios that when coupled with an OD give many real road options. Much better than limping from town to town just so you can brag about beating an poorly tuned V8. I agree that much of this technology is obsolete, but look at the engines we put in front of these tranmisions. Anyone running a pre 4.2 and talking competitive performance at an affordable price is blowing smoke. It really doesn't matter what gear box is behind the old motors past personal preference, and that is what brings us here anyway.
