Not a good day

So today i put my new radiator in, changed the oil and put in some royal purple, changed the filter, tinkered with the timing. After all that i went to go do a big smokey burnout and realized that only one tire was spinning. When i bought the care i was told it had a sure grip in it. Surely this doesnt have one?? does it?? Could i have broke it? can anyone help me on this. I want to possibly get one done now.:mumum:

What rear is in it? Might be a worn Sg or maybe it never had one. Jack car up , put it in neutral, turn one tire and watch the other side to se if it turns the same way or opposite.