broken differential shim

[redcrow5]

I recently had my pinion bearing replaced on my 99 stroker. Not three weeks later it was back at the shop and one of my differential shims was broke in two. What is the likely cause of this? I took a fishing trip to the beach in between and drove 30+ miles in four wheel and pulled a vehicle out of the sand. Would that have caused the pumpkin to twist enough to snap a shim if my tires were hopping?

[late_99_PSD]

A shim????? bout' the only way I can figure to break a shim is installing it. Once its in there, its in there.

[nitrogen]

yes some debris under the shim, not quite sitting flat, most of the shims are cast which tends to be brittle and doesn't like bending stress