Hi All
Have run mine 3 times 1 run on grass 1 run on astro and 1 run indoors 10000 front and 2000 rear, and have had no problems with my diffs leaking at all. Filled the diff`s as instructions and have done what adam has said above, i built them the same way as my 1/8th rallycross diffs, no leaks to date.
