Phasing driveshaft

I have found federal recall info released around 3/2011 to include replacing u-joints and phasing interaxle drivelines on Dana equipped axles. The recall applies to chassis build between 1/2006 and 4/2007.

I would say that all chassis equipped with Dana/Spicer axles and driveline since 2006 have has this change implemented at the factory. Meritor axles were not changed.

The recall points to premature u-joint failures possible causing driveline separation. My first thought is that the drive line/u-joint operating angles were too close when in phase.....not allowing for adequate bearing rotation inside the joint to allow for proper cooling/lubrication of the bearings during operation. Grease breaks down, bearings get hot and dry, then failure?

Thanks to @spsauerland for sharing the other bulletin info.

 

Makes perfect sense to think its close angles. That shaft looks like its pretty straight compared to the traditional angles for sure. I could see where the 45 degree change could fool the joints into thinking they are at the proper angle.
Thanks guys.

 

This phasing business must be a whole new way of looking at how driveshafts are set up.

 

Id switch it back if it was mine.

But I guess if you have a failure at least you will know why.........

 

Isn't there a bulletin, is this what that was about? I have a shuddering on my 13 volvo, it isn't near as bad once I'm doing 70-75 mph but getting to that speed feels like the rear axle is dribbling down the road like a basketball on a basketball court. Can't really feel it bobtail but can with any load on the rear. I assumed everybody would know about this, for 2005 at least. Hadn't even thought to look at mine until finding this thread along with the bulletin.