Hey guys I'm new to this forum and my first post so I thought what better place to go ask for help.

First I'll give you some of the background on my repair, for a while my bike has been crunching, creaking, and creaking near the BB area. I eventually figured out it was the BB and removed my cranks with the a bottom bracket tool and bought a new BB. The old BB removed very cleanly from the shell, I cleaned the threads of the shell with a brush and they looked nice to me. When I went to screw in the BB on the drive side (with grease) I do two full revolutions by hand then it just stops in its place. The threads looked very clean to me so I was surprised. If I can't hand tighten it I thought that I shouldn't try to force it to thread with a wrench. Don't worry about the measurements on the BB they are all correct so this wouldn't be the problem on my frame. I was curious about the non-drive side, so I took the cup of the new BB and it screwed by hand like BUTTER, like its supposed to. I also tried to screw in the OLD BB back in and its stops at the same exact point as the new one. Do I need to take my bike to a LBS to have the threads chased? I do not see any other options but I am welcoming any suggestions because I do not know a whole lot. If you do think that they need to be chased and have done it before, give me a ballpark price of how much is cost you to get the job done.

Thanks.