I use Mobil-1 synthetic grease on the splines, swingarm bearings, and the new u-joint as well.
Any good extreme pressure grease will work, if you change it often enough. Honda moly lube (which has like 10 times the moly found in "moly lube" grease commonly sold at places like Kragen) is a great choice for the splines, if you want to extend lube intervals; but I do this shaft & swingarm lube every time I change the rear tire. I get around 7000~8000 miles on a tire, and if you do it that often, most any good quality grease will be sufficient in my opinion.
I actually let the factory grease go about 12,000 miles, and it was still OK, but I'm glad I didn't wait longer. It was about to the end of it's lubricating life.
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