I bought them from Flaming River.
I was going to buy them from Summit, but there was a delay in the shipping date (I think it was 2 weeks). The shipping was more than Summit, but I had them in a few days.
As Garth posted, part number is FR1761. The description states that it is 9/16"-36 x 9/16"-36.
I bought two, but I have only installed one. My original u-joint at the ZF felt kind of stiff and jerked as you moved it by hand, kind of like a u-joint that has flats/grooves worn into the trunnion by the needle bearings. I did notice that the shifting is smoother.
John
http://www.flamingriver.com/in...mode=prod/prd193.htm
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