Hy oldbluetruck, I think the standard transmission was the SM318, there was also available a heavy duty transmission that was fully synchronized, its designation escapes me at the moment. There were floor shift conversion kits sold in the old days, the Hurst Mystery shifter was one, I don't know if you can still buy them new or not. So to begin your search, you have to know if your transmission is the fully synchronized one, or if it is only synchronized in second and third gear. If you have the fully synchronized transmission, just post that here and I will find the designation for that transmission, hope that helps.
