If a clutch is going out the the friction is in the fluid. If you change the fluid you no longer have the friction so it slips.
I'd leave it alone. What is it sc300/gs300? You can get a low mileage trans for real cheap if it goes but those things are beasts. More problems from the electronics part than mechanical part from what I've seen.
And I know quite a few na-t 2jz guys that didn't put their kits on until 250k+ miles and still make 400+who for years.
The is300 bottom end and 5speed auto is considerably weaker than the older stuff.
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