As much as I cussed mine, especially after it breaks shear bolts everytime I spin it, I have to admit that the gear box is pretty tough. To save time in the field, I swapped form grade 2 to grade 5 shear bolts. /forums/images/graemlins/shocked.gif At the time I didn't care if I destroyed it. I was sick of changing the bolts!!! /forums/images/graemlins/mad.gif Anyway, I've now broken off several grade 5 shear bolts with no damage to the gear box. I did actually twist a 12" auger in half with it though. /forums/images/graemlins/blush.gif