[rotorwrench]

I think Spicer/Dana manufactured the AMC 7-9/16-inch (AKA AMC-15) for light duty 4 and 6-cylinder application back in the late 60s. When Spicer/Dana put their own designation to it then it followed their normal torque load rating system. It became the Dana 35. Torque load rating would be 3,500 ft/lbs. The Dana 41, 44, 45, & 53 all follow this rating system.

If it is a bare housing with spring pads only then it likely is a fair bit lighter than the Ford 9-inch. They are available in narrow configurations so someone that just wants a narrow driver rear axle assembly to fit an application like an old Ford could use it. They sometimes have some odd ratios but AMC used it for both 2WD and 4WD applications and Chrysler/Jeep/Eagle likely followed suit for a time.