Typically, yes, a 3/4 ton with a 4spd will have an 11" clutch.
If you need a 14 spline 11" disc, try a 1985 Astro van.
If you need a 26 spline 11" disc, try a 1985 V8 Camaro.
Keep in mind that the casting numbers are for reference, as the size of the clutch is determined by the machining process, not the casting/forging process...
