We use the standard steel AE outdrives, and they wear out long before they break. The outdrive savers that Chris Long made for us went on the X - 5 which used Losi plastic outdrives.
Team drivers usually re-build their diffs because the outdrives are worn, not broken. This means the outdrives are doing their job preventing body lean. You want the correct amount of friction between outdrive and dogbone, but not a gouge in the outdrive that restricts or prevents movement. Many club racers run their outdrives way too long.
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