Im on my 2nd set of diffs and only had about 20 tanks of fuel threw this thing . The diffs keep stripping the inner gears . I even shimmed them . Dose any one know of a fix for this problem . I heard you can use hpi gears but I don't know which ones or if it would work as I m past the warranty . Don't know why they would use such cheap metal on the gears . Some one please shoot me in the right direction