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Be sure not to confuse a flex disc, which is usually on just the front, with a rubber coupler, which is usually on the back (there are variations though, on some cars).
The flex disc is the one designed to absorb driveline shocks, the rear one is just a chunk of rubber that looks like a flex disc.
If you look at a new one, where the metal parts are molded in that the bolts go through, you'll notice the metal parts aren't exactly centered in the rubber. I can't remember which way they are offset, but they are offset. On one side it will absorb a bit more than the other (I would assume more cushioning when enaged in drive?). Anyways, it's not symetrical, it is directional, although it can be fit either way. You can equate it to a directional tire, I guess. It will mount either way but only one way is correct. Why they can't put "front" on there in a few different languages in beyond me, would seem like an easy thing to do. Or just put it on the flex disc in paint instead of casting it into the rubber mold?
Gilly
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