The following image shows a posi carrier that has new posi cones fitted. Over time the posi cones wear deeper into the ends of the carrier, and the clearance gap is reduced. Eventually the cones will bottom out on the ends of the carrier and the carrier will then only function as an open centre. I would not recommend running cones with less than .030" clearance as although the posi will still function it won't be long before the cones bottom out and require replacement. This example shows new cones with plently of clearance. Remember there are two cones (one each end) and they often wear at different rates

How to check your posi unit in car:

1. Secure car safely with wheel chocks etc, remove handbrake and place gearbox into NEUTRAL.

2. Raise one rear wheel from the ground

3. Measure the torque required to rotate the wheel that is off the ground. This is called the breakaway torque, and if less than around 35lb/ft the centre requires attention -- either shimming or cone replacement.

4. If the carrier is not currently installed the breakaway torque can be tested by securly placing an axle in a vice, with the splined end pointing straight up. Sit the posi unit onto the axle in the vice and place a second axle into the posi. Measure the torque required to rotate the second axle.

NOTE: A very quick test can be done without the use of a torque measuring apartus by hand by attemping to rotate the raised tyre by hand. As a rough guide an average person should have a reasonable amount of difficulty rotating the raised wheel, if able to do it at all.

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