1997 Dodge Ram Shift Delay in Transmission?

I currently have a 1997 Dodge Ram 1500 Laramie SLT 2WD, and the transmission has a delay when shifting (automatic). Apparently I need to have the transmission serviced. What type of service is associated with the given symptom, or does it require replacing the transmission? Also, either way, what would I expect to pay for such service?


I was told that more than likely it may be front pump wear and to try dropping the trans pan, installing a new filter, and reassemble. Then flush the transmission with ATF+4 trans fluid and add 1 qts of Lucas Transmission additive, in place of 1 qt of trans fluid, and this may expand the life of the transmission. Is this a common practice for this symptom? And if so, how much life do I expect out of the trans?
I was hoping I could get about 15K-20K more miles on this transmission, without serious work needed.(I have 185K on the truck now)

Also, are there common methods in doing self diagnosis on a transmission? I dont shift my truck into different gears while driving, but I was told to test for delay while driving. Its an automatic, so I never do that. How can I run a full diagnostic or check it out myself without having to take it to a transmission shop?

Any input or ideas is greatly appreciated!