199 GMC Sierra 1500
5.7 vortec
4L60E trans

Just swapped engine in my Dad's truck that has been sitting for a couple years the transmission was fine when engine was blown and truck was parked. I replaced the engine, flex plate, torque converter. in the linked video below the truck is in Reverse and when i say "ok" it get put in Park. it makes this noise in R,D,3,2,1 but not in P or N. it will drive (drove it down my driveway and back)


thanks for looking