When is Sure-Grip actually necessary?

RustyRatRod said

Driving a sure grip in wet conditions with short gears and a lot of power requires some finesse.

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My racing venue for 35 years is rally, not sissy TSD but WRC type. A tight posi in a rear drive car takes the finesse mentioned by R-cubed and some courage to drive hard whenever traction is limited. The issue is that at some point the rear will happen to be in a spot with good traction and the front will be in lesser traction. The result will be that the front slips as you try to turn because the rear grips and drives the car straight ahead; not good when you are heading into a turn in rain, snow, or on gravel!

So for street driving a posi for general daily driving, my advice is to not get the posi too tight; stay with stock level tightness settings. I know most of you guys drag race here so this may seem odd for a posi, but for any limited traction driving on turns you gotta be careful to not overdo it.

For my RWD rally cars, I learned long ago to put in extra rear brake bias, and a heavier rear sway bar with posi in particular. Both enable you to kick the car's rear out more easily (as does a heavy flywheel; more counterintuitive stuff eh?) and helps you fight the 'drive straight ahead' tendency of a heavy posi in gravel. You then stand in the gas to use the power to steer once the car is sideways. Done right, it'll make the Duke's look like they still are in Driver's Ed!