Originally Posted by
markk
Lots of work was done when using for competition, first was don't use the 3.9 front, the physical tooth count is too low on the pinion to get any cut into it. That is why step offs came about for the MT75.
There are motorsport backlash settings, this does affect life and noise though.
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Yes, Bara said to me that no matter what you do the 3.9 CWP is the weak link and will be the bit that breaks first on my diff. He said that it will not take the quaife diff with it so if I break it I can sell on the diff and then upgrade. He thought it was marginal at 500 bhp / 500 torque depending on how it was used but he is pretty certain that my stroker at 630bhp and whatever bigger torque it makes that it will most likely not last all that long.
I am hoping that my car being light will help as ultimately it may well just spin the tyres. I only have 215 section track day tyres as that is as big as I can go.