$1500-$2500 is ballpark depending on what is done. A full rebuild $2500 is reasonable.

The seals only will cost no more than $50.

Whatever you do -- BARE minimum REQUIRED items are front pump seal and B3 reverse bands.
At that mileage too, have the TC height measured.

Where is it leaking from? You cannot possibly be losing that much fluid that quickly from a pump seal...You have a serious leak probably from the pan gasket.

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