There are basically only two types of transmission slip yokes for all E-Body applications. Now OPGI has both of them, brand-new with different lengths, depending on the application. They’re made from ductile cast-iron and are machined to the exact same tolerances as the GM originals. Between the two different spline counts, and the different-lengths, one will fit all GM manual or automatic transmission applications.
The 27-spline fits Powerglide, TH350, 700-R4, 200-4R, early B/W T10, ’63-70 Muncies (except ’70 M22) and all Saginaw manual transmissions. The 32-spline yoke fits the TH400, ’70 Muncie M22 and all ’71-74 Muncies.