www.dependabledriveshaft.com
check these guys out I've had problems with autopart store axles but these guys rebuild them using oem parts and they charge only like $65 dollars and im puttin down about 300whp and no problems now and its been about 8 months since i've had them done and i think its only like $100 total for them to remove it from the car rebuild it and reinstall it if you can't do it yourself