Replaced hot and cold price phister seats & stems and tub still drips. Why?

If you replaced seats and washers - and faucet still leaks, then recheck your installation. Make sure you are using correct size seats.

If you have 3 handle faucet and tub drips while shower ON than replace seat and washer in the diverter stem. If you have 2 handle / 1 handle valve with diverter spout and spout drips while shower ON then replace diverter spout with new one ( or get replacement parts for the spout diverter - if you can get them )

Hope that helps...

Back to you. Milo