AFAIK the 297 series is the biggest U-joint you can use in a D44/10b shaft. Based on everything I have seen, CTMs are the best wheelin joints ever made. Ox's are cool, but some people have reported problems on pirate with them coming apart on them... usually the joint body itself is fine, but the screw in arm parts and/or shaft ears are toast.
The Jantz joint is a good alternative if you don't drive your rig much on the street... it has no bushings at all inside its caps. This, naturally, increases friction but it also allows for much larger "arms" on the joint. The D44 Jantz joint, for instance, has larger arms than a stock D60 joint does. The D60 ones are over in inch across. Thats some serious beef. Randys/Yukon are in the process of mass producing the Jantz joint. The D44 ones are already available. Think they just call it "The Super Joint". They are 4340 and use a gold-colored titanium finish is decrease friction/wear due to the lack of bushings. Apparently they don't currently cryo them... but if you want to go with the Jantz joint, you might want to send them off to have them cryo'd yourself.. will probably make them last longer. Jantz himself owns a rig that runs 44" TSLs, so I can only assume these joints have been tested quite a bit. He's some sort of aerospace engineer if I remember right.
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