AI comes back with that number as a 4 speed. Predating the T-5, apparently.
"The Borg Warner 13-38-065-901 is the part number for an aluminum-cased, 4-speed manual transmission commonly used in classic GM vehicles from the 1970s, such as certain Chevy Nova, Camaro, and Cosworth Vega models, serving as a robust replacement or upgrade for period hot rods and performance cars."
