Unless you're developing enough power (150-160 minimum) AND have enough traction (slicks and suspension specifically set up to drag race, which is contrary to what we do with our cars) to lift the front wheels I wouldn't worry too much about breaking stock axles. The important thing when you take axles off a car is to keep them on their respective sides. 15 tooth end gears go with 10 tooth spiders, and 17 tooth end gears go with 11 tooth spiders, and the superdiff housings are machined slightly different for each. You were talking about using a different trans builder this time around- given your reasons, I'd probably be doing the same. It's one thing to be loyal to the guys who take care of you, but if they're not, then.... Your canucklehead buddy Al.