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I agree the 901's are throw away boxes, but why waste your time re-gearing a box that is known to break under extreme loads ?
Same thing with the 915 box. By the time you buy the tall R+P and have it installed, you could have bought a 930 box and had it flipped for the same price without re-gearing it.
The 930 box withstood 6500rpm 425lb-ft drag race launches for several years before I broke a stub axle. In a 911 this equated to 60 foot times (on a concrete launch pad) of 1.28 with the front wheels 1.5 feet off the ground. Oh.. the car weighed exactly the same with the SBC (all aluminum engine..Donovan 400CI)
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