Was the Saginaw 4-speed transmission used in the Corvair after 1966?

There is a confusion about the terminology. yes there was a new transmission made by Saginaw in the 1966 Corvair. It was much stronger and capable of handling more stress. Saginaw also made their three speed with an all sychro first gear for the first time. Previously, GM bought the three speed from Ford. The 3 and four speeds, with the addition of the 2 speed powerglde automatic, remained in the Corvair line until 1969 when it was discontinued. The previous 4 speed transmission was often called a Borg Warner but was in fact also a Saginaw product