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Correct, the OEM diff case is prone to flex. There is only so much you can do to beef up the stock rear, Jannetty can do his mods that will considerably strengthen it but when you get over 550rwhp then one should really start considering one of our fabricated 9" rears.
Our heavy duty fabricated housings don't flex under severe loads and we use the Strange 35 spline S-Trac that was tested by Strange in an 8 second car before being released.
Give us a call if we can help.
Thanks
Chris
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