Driveshaft Alignment

[ati190]

After searching through various scenarios, I've discovered my driveshaft may be out of alignment, causing vibration. Can anyone tell me how to check, and get this driveshaft back in alignment?

Thanks
ati190

EDIT:

The long driveshaft is definately in alignment (both ends of the shaft). Both yokes go vertical and horizontally with each other perfectly. However, the short shaft that slips into the trans does not align. The front yoke is vertical, but the end yoke sits an angle, While the yokes are vertical on the front, the back does not sit horizontal.

 

[fishntruck]

Ditto

After having the carrier bearing replaced, the very reputable repair shop didn't get the front shafts aligned correctly and, even after two 2-day returns they have been unable to correct it. I've still got vibration that wasn't there prior to the carrier bearing replacement. The guy who did the initial work told me that there is really only one way for them to go back together, so he didn't mark them for future alignment. Since then they have also replaced both rear axles and associated seals, rear u-joint and both wheel cylinders (bought the truck from a kid who didn't believe in routine maintenance). The vibration is readily noticeable, they've re-replaced the carrier due to vibration failure and I'm wondering what may fail next and how do I get it aligned correctly? Any help out there? Thanks.

 

[Uly The Hermit]

My '99 Ranger 2WD regular cab only has a one-piece driveshaft with no dummy transfer case. But my '78 F350 has a two-piece driveshaft with a carrier bearing. I thought it was normal for the rear section to droop a little since it's a floating differential. On mine there really is only one way for the two sections to go back together but I marked it anyway before removing it. I don't have any noticeable vibration but I do have some rather loud drivetrain noise so now you guys have me wondering.

Have you been able to find the factory yellow paint marks on the driveshafts/yokes to confirm they were put back the way they were? In my experience they are difficult to find after the truck is several years old.