driveline help please

[custom67]

I have 67 chevy truck. 4 link air bag suspension. cab droped down. the frame sits on the ground. I just got this done and I am having a problem with the carrier bearing. It keeps breaking. I spent the money on a polyurathene one ($119.00). and it only made it half way down the street, before it broke. I need to fix this problem so I can drive to get it painted and the interior done. But this is my main problem. help please I have been working on this truck for so long now. Someone said we could channel out the cab and use a one peice drive line. money dosent matter, just need to find out how to fix this. I know some of you have slammed these truck before and ran into this problem.