You said it doesnt spin the tires which isnt a surprise seeing your running 315-60-15 M/T drag radials. Isnt that they idea behind them ? Throw some 215-70-14s street tires on it and see how it spins them.
How does it pull once you get moving ?
Also, Send the TCI converter back and save for a good one. Dynamic, Turbo Action, Ultimate etc.