This is your problem: "KC Pond 482 S/O" (If that is a problem?) Exerting Massive Torque leaning on 28 spline axles with sticky tires.
Do
NOT leave it as it. You can change a very few pieces in your existing posi set up and do yourself good by changing to 31 spline axles. If that axle twists the end off as it is close to doing, your car will make an immediate dangerous turn to the side of the broken axle, very unsafe and uncontrolable. Buy new axles made to the necessary length, resist the temptation to respline existing axles after shotening them. After shortening (mostly on 28 spline applications) the material is not hardened as the original splined area and is weaker than before.
When I redid mine a few years ago, even though the little 289 has nowhere near the torque you have, I upgraded to a 31 spline 9" Nodular carrier with new "Good" axles. By doing this I know I will not ever have to contend with an axle or differential failure.
From Strange's Website"
Quote:
We manufacture Ford 9” 28-spline axles for low
horsepower and lightweight “street-rod”
applications. Although our 28-spline S/S axle
is stronger than OEM 28-spline shafts-
28-spline S/S axle shafts are
significantly (38%) torsionally weaker in
comparison to 31-spline S/S axles. We
strongly recommend to upgrade to 31-spline
axle shafts for street applications.
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Take it for what it's worth..........
Here are some very good sources:
http://www.dutchmanms.com/
http://www.moserengineering.com/
http://www.strangeengineering.net/catalog/index.html