Hello! I am planning the big road trip starting late summer. Eastern Pa across the north to the rockies down to utah/arizona going east to Fla... I have a decent high mileage 455 w/good compression and new timing belt. 6 disk brakes with newish pads I plan new tires (though currently have 16.5 firestones date code 4/20 with about 20K on them...) new engine battery. MY QUESTION _ does anyone know a shop anywhere in the North East that knows GMC's and can do transmission service, wheel bearing work, bogie inspection etc in preparation for the Big Trip? Many thanks for any tips!