Saginaw Overdrives were used in Chevrolet cars from '65 to '68?. Borg Warner Overdrives were used on Saginaw 3spd transmissions.

Putting that BW O/D on a Saginaw 4spd trans makes a very nice setup. You need an adapter for a '61-'62 Stude 4spd bellhousing tho!-

Jim Lemke, North Fond Du Lac, WI - April 2018