Just get a can of wheel bearing grease at the parts store it will work fine with what the bearings came with. Don't forget to replace the seals as well.

clean all the grease out of the old bearings and repack them with fresh wheel bearing grease. Install new grease seals and reinstall

General Motors wheel bearing grease. Avsilable at any GM dealer parts department.

jesus people dont know squat these days. you get disc brake type wheel bearing grease. i use high temp personally. pack the snot out of them. tap rear seal in place. double check the nut after a week or so, cause things are gonna settle

I want to replace the when bearings in my 99 Chevy Astro van. I purchased some new bearings...to my understanding they already have some grease in them. Also to my understanding all greases are not compatible...So I know I'm going to need some additional grease when I go and install them. So what do I do? Use A solvent and clean and remove all the grease in the new bearings and use all new grease to repack and install the bearings?