Do you have an idea of what is grinding? Did you goop (it's a technical term) a bunch of grease into the green cup before you installed the half shafts? Where the inner CV joints packed with grease before installation? Are the boots still intact and clamped in place?
As far as I could tell the SurTrack axles are VERY well made. I had the SurTrack's sitting side-by-side with my stock half shafts and, if anything, the SurTrack's looked like they were made of beefier stuff. 
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