Im getting ready to install a one peice driveshaft in my megacab tonight. However with a 6 inch lift I think you would want to stay with a 2 peice shaft. Did you drop your carrier bearing when u did your lift? Seems like they are constantly needing shimmed to stay alligned.
Im going to guess that's why ur bearing has been going out, it needs a serious drop. My shaft is oem from dodge. They went to a 1 peice shaft on the longwheelbase trucks after 2007 I believe. Its pretty pricey lists for$735. Some searching on this and other forums will help you out alot.
735 holy crap where did u see that, I only paid like 350-400ish for mine brand new