I have the Billies .85 in the front & the 3 Leaf AAL in the rear with the OEM overload leaf on:
I have take-off vibes and if I try to maintain my speed at 15-20 MPH I can feel a slight shudder that goes away if I take my foot off of the gas. It almost feels tires (BFG A/T's 265/75r16) but I didn't have it before. I do not have any other vibe/shudder issues after that & up to 110 MPH that I have tested it at. Also, the 15-20 mph shudder is only when taking off slowly, as in traffic or a school zone. If you take off normal to fast you do not even feel the shudder.
I took off the OEM leaf which lowered the rear about 3/4" & I feel the symptoms a lot less. The problem is that I like the raked look of the truck with the overload leaf on. Would a CB drop help? If it doesn't & I put on the leaf again & decide to live with those symptoms are there any safety issues? My mechanic drove it & said he can only feel the take-off vibe. My wife did not notice anything.
If I load my truck up with 5 people you barely feel it since the weight apparently brings the angle back to stock. Good to know when I tow my dad-in-laws boat, I guess.
I am hoping that a cb drop will help since that is easy