Quote:
Originally Posted by kerry
Different in weight. Some are balanced together with the specific crankshaft in the engine so are not simply interchangeable. Flex plates are more likely to be interchangeable I think.
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Generally Kerry is correct. This, again generally, is because a flexplate has very little weight to begin with.
Engines are either internally balanced with crankshaft counterweights and such, or externally balanced where specifically positioned and specific size weights are put on the harmonic balancer and flywheel. So, obviously, an externally balanced engine will sometimes have a balancing weight on the flexplate or maybe in some engines the torque converter.