I was considering going to an aluminum driveshaft when I convert the tranny to a 3550; since I'd have to have the driveshaft shortened anyway. First, is this a worthwhile upgrade? 2nd, how much hp/torque can an aluminum driveshaft handle. I've got a 351 Cleveland, currently at 266 rwhp and 327 ft/lbs torque with an FMX and 3.25; and plan on getting it up to 325-350 rwhp. Should I just shorten the current driveshaft, or switch?