Is It Junk In The Trunk Or A Bad Rear End

2006 1500 Ram truck Transmission shifts hard just once. 81 El Camino just bought it. 07 C6 Corvette custom tuning. 00 Silverado Service 4x4 light is on how to fix 4x4 24 F350 Using a winter cover 14 Subaru Cross Trek transmission and rear end.