Your 01 trans will have quick connect fittings and you can leave these in the trans if you have matching lines. One problem you may run into is that around 98/99 the radiator fitting also switched from threaded style to quick connect and if your 98 radiator does NOT have quick connect fittings then you will need to get these, they will thread right into your radiator if it requires this. Napa sells these fittings if you need them.