> The torque on the IRS diff is
> countered by the mounts to the frame.
Well, make up your mind ... in your earlier post, you said:
" An IRS would transfer all that dynamic
force to the axles by way of the diff gearing."
I agree, the solid axle transfers part of the force (both static and
dynamic) into the rear suspension, which might not be the best place for it.
But it's big, and tough, compared to the diff mounts; which is why the solid
axle ODs can shift harder than the IRS can take.
And also why "IRS muscle car" is very close to being an oxymoron <G>
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