no some of the older trucks were steel, my 01 has a 2 piece steel shaft with a carrier bearing.
That said, im 99% sure all duramax drive shafts use the same size ujoint, steel or aluminum. Maybe the OP had a aftermarket drive shaft made? seems weird they wouldent re-use the yolks though....
If you absolutely cant find the right U joint, pull the drive shaft out, pop out a ujoint then bum a ride to the parts store with the old part in hand.
I also run non greasable ujoints. The greasable ones really dont seem to last any longer and there kind of a pain in the butt to grease.
It seems the 2 piece were used for the long beds w/ CC or EC. I have seen some other posts on other forums where people said they had the steel shafts with the larger yokes as well... they seem to be the 1480 series vs the 1410 you all speak of. That matches with what I have in the 1 3/8" dia u joint caps. Unfortunately, I've been sitting with my driveshaft in my basement since Saturday so I've had way too much time to look at it and the u joints lol
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06 ECSB LBZ. Edge evolution, AirDog2 165, rear air bags, Transflow aux fuel tank, brush guard, headache rack