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Depends on your application.

I like S-60 rears for high torque, leaf spring equipped street/strip cars.

9" traction differentials are not particularly strong because clearance issues with the pocket bearing at the end of the pinion dictates small moving parts inside the carrier. In contrast, Dana 60 traction differentials are much more robust.

Due to the sheet-metal construction, 9" rears require a back brace for housing strength. This does not jive cleanly with leaf spring perches and shocks.

Because the tubes insert several inches into a machined casting, a back brace is not as critical on an S-60 housing.

The best thing is, I sell a new BOLT-IN, 35 spline S-60 rear with heavy duty S-Trac differential for $2175

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