Drive shaft failure!!

I have a situation that I'm hoping for some help getting an answer,last Sunday i went to work,I'm driving a 14 cascadia freightliner,as i always do i got in my tractor and backed out of my spot and pulled over and lined up with my trailer,as i was rolling back the driveshaft snapped off at both the front and rear u joints.the shop said this broke the gear box on the tranny.my issue is what would cause somethinglike this to happen

 

Made in China U-Joints.

 

When you grease the U joints, make sure the grease is getting through to all 4 caps. Before Christmas, I was doing a service before a trip. I always jack one rear wheel up with the brakes off so I can turn the driveshafts by hand. Lo and behold there's movement in the front inter-axle shaft U joint.
There was no grease at all in one cap and the half the needle rollers were missing. The cross was worn down to a taper. The other 3 caps had plenty of grease in them.
If I hadn't caught it, it probably would have let go. Spicer 1810 U joint, not Chinese crap.

 

It will look something like this I'm sure.

 

When I grease my u-joints, I pump grease into them till they start popping out the old grease and continue pumping till I feel the new grease has pushed out the old. I do this on both grease zerks and make sure you clean each fitting before you attach grease gun, you don't want to introduce dirt and road grime into the cavity.

I wear disposable coveralls when I am under the truck and by the time I am done I'm covered in grease but I know I got everything lubricated well.

 

My 05 Volvo has greaseless u joints.. I know that's a little so where I could take out and screw in a zerk. Think it's a good idea or not?

 

You cant put a zerk in those ones.

 

Yeah that's what I figured itwould obviously push the seals out when greased.