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This is my understanding:
In a trans that is in good shape, a flush is not a problem. There aren't too many particles suspended in the fluid modifying the friction and the internal clutches and such are still in good shape.
In a higher milage trans there is more wear and the particles suspended in the fluid may be preventing slippage since the fluid is not as "slick". Trans anti-slip additives work this same way, kind of like a limited slip additive for a clutch posi.
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