I know the post was about a week ago, but let me ask. What was the reason for replacing the intermediate shaft / joint?
If it went down the road straight with the steering wheel dead on and you have no issues with tire wear, the alignment shop is going to sent you a X-Mas card. Pull the steering wheel with the truck going straight while stopped and pull the steering wheel and put back on straight. I don't trust aftermarket trick parts and could be machined wrong. If I took it out of an ACDelco box, pre-marked the shafts splines, there should be no problem. But at the alignment shop, they place a spring load steering wheel holder while straight ahead. When done, if the numbers on the screen are correct, but the steering wheel is crooked, it comes off and re-installed...straight.