I just did a body lift on my truck this weekend , and once we were all done, I shifted into 4 hi and 4 low, just to make sure everything engaged. 4 hi had no problem, but 4 low would make a huge clunk that it's never made before, but it did engage. I'm 99% sure the BL had nothing to do with this, so am I just paranoid, or is there a real problem here? Thanks in advance for any help...