This Friday I'm going to be picking up a set of slicks for 4415. Next on the list is gears, then axles and a new dif. I'm upgrading to Moser 31 spline axles and Frpp 3.73 gears. Looks like I'll probably end up with the Eaton LSD. According to american muscle they claim it to be "almost bulletproof" Anybody here have experience with them? Just wondering how close to bulletproof "almost bulletproof" is. 4415 is stock at this point, no power adders, and no future plans to add one, so I'm sure it will be fine for my application. I've got all the money saved back for the Nats now, so each paycheck will buy something to upgrade the car, and eventually when I have all the parts I'll have them installed. After that will be SFC's jacking rails and upper and lower control arms. Is there a preference on which company to buy these from? I've looked at both Steeda and MM for the control arms and sfc's.