I haven't had much luck with these shocks. When I purchased the truck, one of the for shocks had no oil in it. After a short period of use another one stripped the bottom cap out of the housing. I waited for them to arrive back in stock then ordered a pair of replacement shocks from HK and when they turned up one of them had leaked its oil throughout the package. I refilled it with oil, made sure everything was tight and it leaked out again straight away. So I still can't use my truck which hasn't even discharged 1 set of batteries in it yet and it has been 1 month now since I first had the issue. Even though HK has fairly sharp pricing I think they still need to look at their quality control and get their support team to read information provided to them properly. FRUSTRATED!