I've had MAJOR issues with my 2017 yukon getting lowered. Ordered the 2/4 kit, and after a few days waiting for a tracking number I'm told the spindles are on back order. Waited weeks only to be sent the wrong ones. After a few messages back and forth with him that were no better than automatic replies, I ended up dealing with it directly with belltech. Numerous message and call attempts over a few months and still haven't gotten any help. For whatever reason, the drop spindles only lowered my 17 3/4 of an inch. Belltech sent me another set, and the new ones did the same thing. Still riding around like an idiot with the rear dropped 3 inches lol. So if anyone wants to buy a "used" set of drop spindles I have 2. I'm actually going to make a detailed post in another thread to see if anyone can help with any ideas.