If it is driving fine I wouldn’t take the gearbox apart for the sake of it, I had mine rebuilt and it was a 3k bill it was the six speed and it had a new torque converter and valve block and a new spline kit.
But saying that if you have taken it out it would be a lot cheaper. But you can drain all the oil out as you can tip it to empty it out and completely refresh the oil.
Good luck whichever route you choose.
Daniel
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