The focus of this thread started as a comparison between a Dana 60 and 9" for a high torque STREET/STRIP application.

These are actual prices of comparable rearends that I will sell any day:

New Strange-60 Dana 60 assy, forged steel 1350 yoke, choice of ratio, Strange-Trac differential and 35 spline axles complete with leaf spring perches installed $2225

New Strange-9" nodular iron case, aluminum pinion support, forged steel 1350 yoke, choice of ratio, Strange-Trac differential, 35 spline axles, fab housing with short back brace and leaf spring perches installed $3175

The price difference is $950.

The weight difference between these 2 assemblies is negligible, with a slight edge to the 9".

The difference in efficiency between these 2 assemblies is negligible, with a slight edge to the Dana 60.

The size of the 9" differential is dictated by the presence of the third "pocket" bearing. Because of this, 9" differential internal parts are much smaller and weaker than the Dana 60 version. This is not a concern with a spool, but it gives the Dana 60 a big advantage for a heavy/torquey street/strip car with a traction differential.