72bluNblu said

The F body was brand new in '76. They came out with basically all new tooling for this model. Tooling wears out, just a simple fact. Why did they change the design? Gosh, maybe because the FMJ spindles are an IMPROVEMENT to the original design. Maybe because bias ply's were no longer the norm, and radial tires have different suspension geometry requirements. Truly, you won't know unless you talk to the engineer that did it. But it probably had more to do with re-tooling everything for the F body than it did with changing the spindles.



They can start with YOUR car!

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What would be the inspecting parameters? Originality? Look at the Corvair. That was a factory engineered HORRIBLE suspension design. Much worse designs rolled right off the factory floor. What about putting 73-76 disk spindles on 67-72 cars? Those spindles are in fact different from the originals, and even change the track width as compared to drum spindles. Are cars that came with 9" brakes safer than cars with 10.98" disks? Should you not be allowed to upgrade your car to disk brakes because it the 73-76 A body spindles weren't in fact designed for your 67-72 car?

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All these inspections would accomplish is adding a layer of bureaucracy that doesn't need to be there- at best. At WORST, it would price the average car guy completely out of the hobby.

Do us all a favor- actually READ this article

http://www.moparmusclemagazine.com/techarticles/suspension/mopp_0503_swapping_a_and_b_disc_brake_spindles/viewall.html#ixzz2mdrVgwLG

All the information you need to consider when switching to the FMJ spindles is there. They tested bump steer. They tested the "over-angling" assertion that was made up to begin with. They tested the caster and camber changes, roll center, etc.- they analyzed the geometry completely. The DATA is there. How do I know? Because I was an engineer, that's how! And because I run the FMJ spindles on my own cars without any issues whatsoever.

If you want to not run anything other than stock A body spindles on your car, that's your choice, and be my guest. But don't insinuate that the FMJ spindles aren't safe without any information to back up your assertions. They've been tested, and they've been shown to work fine. Why the design was changed isn't relevant in the face of the data showing that the design is safe on our cars.

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