When I run water through this tub spout (diverter in down position) I still have water leaking from the showerhead. I have seen water from a tub spout when the shower is on, but not the other way around. Any ideas? Bad diverter?? thanks

Nonsense red echo, you don't understand the issue.

What type of valve are you connecting to peeshon? I bet it has a 1/2" connection to the tub spout. I find the amount of unwanted flow out the shower spout depends on the settings of the two valves when filling the tub.

I discovered the same problem when I had replaced an old American Standard 2-valve having a 3/4" threaded tub connection that connected to a spout with a 3/4" threaded connection and diverter at the back. The new valve has a 1/2" spout connection, and the new spout has a 1/2" connector with diverter at the spout end. The plumber also used sharkbite connectors to the tub spout, which due to the inside plastic connector further reduced the inside diameter to 3/8". These smaller configurations are the problems I believe. The reduced diameter of the new spout piping reduced the flow to the spout and caused significant water flow up the shower head even with the tub spout diverter open. It helped to change the spout piping to 3/4" all copper, the flow to the tub is increased although due to the 3/4" to 1/2" threaded adapters on each end of the spout piping, there is still some water going up to the shower head although it is much reduced. I put a turn valve at the shower head for now to shut off the rest. I am looking to get a replacement tub spout with a 3/4" connector to further increase the flow rate through the tub spout. If there is still a flow up to the shower head that still bothers me, I will have to find a valve that has a 3/4" tub spout connection and replace the whole thing. Nonsense red echo, you don't understand the issue. What type of valve are you connecting to peeshon? I bet it has a 1/2" connection to the tub spout. I find the amount of unwanted flow out the shower spout depends on the settings of the two valves when filling the tub. I discovered the same problem when I had replaced an old American Standard 2-valve having a 3/4" threaded tub connection that connected to a spout with a 3/4" threaded connection and diverter at the back. The new valve has a 1/2" spout connection, and the new spout has a 1/2" connector with diverter at the spout end. The plumber also used sharkbite connectors to the tub spout, which due to the inside plastic connector further reduced the inside diameter to 3/8". These smaller configurations are the problems I believe. The reduced diameter of the new spout piping reduced the flow to the spout and caused significant water flow up the shower head even with the tub spout diverter open. It helped to change the spout piping to 3/4" all copper, the flow to the tub is increased although due to the 3/4" to 1/2" threaded adapters on each end of the spout piping, there is still some water going up to the shower head although it is much reduced. I put a turn valve at the shower head for now to shut off the rest. I am looking to get a replacement tub spout with a 3/4" connector to further increase the flow rate through the tub spout. If there is still a flow up to the shower head that still bothers me, I will have to find a valve that has a 3/4" tub spout connection and replace the whole thing.