JKS Flex Connect Upgrade Kit for Wrangler JK, JL and Gladiator JT easily upgrade your Quicker Disconnect to Flex Connect style. This is a bolt-in replacement for quick disconnect in all Jspec Systems an alternative to traditional solid sway bar end links. Increased on road comfort and awesome off road performance in one bolt on. The design soaks up head bobbleâinducing bumps using specially tuned springs. They compress and extend to allow additional articulation without having to disconnect while still providing some body roll control. Optional Performance Spring Kit fine tunes the balance of body roll control vs articulation. The optional Performance Spring Kit includes tools and tuning instructions.