Dexter manual in the link below doesn’t say which grease for wet bolts but use the same as your bearing grease. See page 53 for a list of greases and page 66 for wet bolt info and torques. (I like Mobil 1 but lots of folks don’t like it and have their own preferences.)
Make sure this manual is for your axle weight. Other manuals available at Dexter.
https://www.dexteraxle.com/user_area...viceOnline.pdf