When I first read the title 'Poly vs Rubber', I thought it was something to do with blow up dolls.
Good info in there. I changed both Trans and engine mounts at the same time. Certainly feels like you are attached to the engine, which was the feel I wanted.
I tried a poly transmission mount in my 4th gen, and hated it.
I had poly in all static mounts, ie non-rotational and loved it.
The Fiero has poly everywhere as thats all I could get for the 88 model year. Its very hard, and unforgiving. I must check and see how they are wearing.
I wonder how many 2nd gen have been destroyed by the use of air shocks and simliar?
Not all. You don't want flex in the chassis. The chassis can't be rigid enough.
The movement must come from the suspension. Suspension must articulate freely at a spring rate that suits both the vehicles weight and use, and shocks are used to control the spring rebound.
Flex in the chassis, is bad. It's unknown spring rate, uncontrolled by shocks and varies according to wear and even side to side.
This freedom or articulation is why poly is bad in control arms, leaf spring ends etc.
4th gen f-bodies bolt the subframe to the monocoque, no bushings, but back in the 70's it wasn't understood.
