I have 2 teeth missing from my spider gears. I have a 39 dokota sport 4x4 with a 3.9l. My question is do i have posi? No matter what i am on i can spin both tires. Even one on pavement and the other on gravel. they both spin. I know that i have a 8.25 rear end with a 10 bolt main. Can any of you help me figure this out. I have to replace them soon. Thanks