I did some additional tests this morning and I’m getting a bit ****** at how constraints are working. I can’t find the way to make them really rigid. I understand that having a completely locked constraint is not the same as completely welding two bodies and there will be some inertia passing from object to object but I would expect at least some sort of stability. I’m thinking about ditching constraint all together and writing all the math myself. So that suspension is build similarly to how Physix handles car suspension, using raycast and applying suspension as a physical force. At least this will lock wheels into their **** position where they suppose to stay.