Hi Trucker,
We want to help and try some troubleshooting to see if we can narrow down where the drip is coming from before you replace it. First, let’s address the clunking, this noise typically comes from the diverter #974-286 and we recommend replacing it, check the cavity of the faucet to make sure there are no obstructions and clear any debris or particles that may be inside before installing new diverter. Second, changing out both the cartridges #974-098 (2) not just one side to make sure the drip is stopped. When replacing them, check the cavity of the faucet to make sure there are no obstructions and clear any debris or particles that may be inside and replace with new seals, springs and cartridges. Third, try removing the aerator housing #941-393S completely from the spout once diverter and cartridges are replaced and see if the drip continues without it on. If it stops then a new aerator is needed to correct this. Please give us a call at 1-800-732-8238 so we can send you these parts at no cost under your product’s warranty and get this resolved. We hope to hear from you soon!
Thank you,
Pfister