Hey guys new to the form. I just serviced a 2003 Chevy 2500hds transmission. We dropped pan, changed internal & external filters, upgraded trans lines to heavy duty ones. Filled with hot shot secrets fluid and added shift restore. After filling started unit up pulled outside to let warm up before test drive came out check engine light was on, truck would not move and when out into gear line under selected gear is flashing. Pulled codes I am getting a p0700 and a p1711. Loud clunk coming from back of trans when it does go into gear and seems to be stuck in a high gear when drove. No issues were present before service was completed.