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Ratrod: if the transmission fluid looks pretty decent, I'd leave it alone. Unless its totally wiped out it will not affect the fragility of the unit. In fact a little slippage on the internal clutches would probably even be better from a stress manaegement point of view. I've also learned (and experienced first hand) that fresh fluid may cause old units to start to leak both internally and externally, so that would be cause to rebuild the unit anyway. So if in doubt, leave the fluid in there. But if it is really burned, brown, or contaminated, change it before running the car.
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