New from South East Colorado

[Red Truck]

I have a question right off the bat. I have a 98 GMC Sierra 1 ton with a 454 and the water pump was going out. Just before I replaced the water pump the transmission stopped going into overdrive. All other gears seem to be fine. I was told that the water pump could effect the transmission and fixing the water pump would fix the transmission. The water pump is replaced and I still have the transmission problem and can't figure it out. Any suggestions before I end up going to the transmission repair shop. Any help would be appreciated. Thank you.