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The front mount on the Spohn takes the load off the tailshaft of the tranny. Its pushing up on the floorpan instead. The pinion angle is adjustable... probably not a big issue for moderate power levels, but becomes more important when you start pushing 500+HP to the rear wheels. Its a bit stronger than the stock piece. I've seen one take a 3,525# 30th SS convertible to a 1.30-sec 60-ft, on the way to a 8.60/160+ mph pass. And it can incorporate one or two DS loops.
On the other hand, their are people out there who have managed to get into the 10's with a stock torque arm.
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Fred
1994 Formula - 381ci / 300-shot N2O / TH400 / Gear Vendor OD / Strange 12-bolt 4.11 - 11.5@117 on straight motor
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