the rings are the same m8 so will fit without issue. 2 possible things of fault there
1. you are using way to much grease on your diff. the pred diff works very well with just the thinest of smears on both the diff rings and the thrustrace or the ceramic balls will slip and cause problems.
2 if the diff half is worn on the corners of the D it will allow the diff ring to twist slightly causing stress in that area and making the rings snap as if for no reason. it doesnt need a lot of wear for this to happen either
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Nathan Ralls HPI, Custom Blitz, www.piraterc.com mr-o foams
woop woop racing officialy keeping team toe out inline 
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