Posi

[F1967]

How Do I know if I have POSI trac or not. I think that sometimes both tires spin and other times only one tire will spin.

[67coupe]

Raise one rear wheel and with the brake off and the transmission in neutral try to turn the wheel. If you can turn it easily it isn't a posi. It should be almost unmovable.

[97chevyman]

well, what year of truck do you have and do you have the rear axle tag, also if it is the stock trac-lok your trick will not work, but if it is a standard locker, thats the easiest way i know how.