I have had a lot of people tell me, "you tranz and rear end will bust on you fast by power shifting and not speed shifting." I then go on and ask them how bad is power shifting compared to launching a car form the dig. I bet launching form the dig puts a lot more stain on the drive train than power shifting. I don't do it often at all. I only do it once in a while on the street when someone wants some (75 drops to 3rd, gas and power it into 4th around 7200). I don't race much, but when I do, I do it to win.
My buddy also says your rear end plays a big part in how long things last. He tells me he has broken his rear end snapping shafts by power shifting. He runs drags radial and low psi running around on the road with his buddies. He said because his rears stick so well, the repeated torque beats on the shafts and breaks them.
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