justin richter

I have a 2001 Suburban half ton roughly about 225000 miles on the vehicle I just got the transmission overhaul 2 weeks ago drove a 16 hour trip up into the mountains to drive back another 16 hours and as soon as I get into town the transmission through itself into neutral i have no gears the light indicator on the shifter doesn't even show what gear it is in at all either when I give it gas and every single gear it's reving itself into like it's in neutral what do I do I'm stuck
Help do not want to drop transmission again .