How would I know? It's a TCI Pro X power glide.Spline count. 17 (powerglide) vs 30 (turbo)
They are not necessarily stronger.... type of material used and the manufacturing process dictates strength. They are popular because you can use a "Turbo" 350/400 torque converter with no other modifications. Be aware, turbo splined powerglide input shafts come in different lengths. Planetary ratio dictates length.
How would you know which input you have? Count the splines, or grab your receipt and call TCI.How would I know? It's a TCI Pro X power glide.