suspension upgrade for dummies

I have a 2015 AC cab, 4x4, 2.7, 5 spd, with a Snugtop shell on back. I just bought and received a lift kit from Head strong Offroad, who are a great by the way, yeah to Marie. What I got was OME 884's, Bilstein 5100's,1/4" shim for driver side, HS 3 leaf AAL,5100's set @0 pre assembled. My goal is to have a slight rake in the back with the shell on. I thick I want to keep the factory overload in place, stock factory,3 leaf plus overload , 4 total. My dumb question is, does the 3 leaf AAL go on below the factory pack, making one larger pack, or does it get shuffled in so to speak. I am not doing the work myself, duh, just want to tell my mechanic how it is suppose to go. He is a trusted Toyota guy but does not like to modify vehicles, "they get it right at the factory". So any input would be great, thanks.

 

subd

 

i just did the 3 leaf aal. it goes together between the overload spring and the other springs pretty strait forward the only hitch i ran into was the bracket on the overload that the p-brake cable bolts to lines rt up with the one on the aal so i cut it off of the aal and bolted the bracket to the piece on the aal

 

Thanks Casper66, I got under there and thought it look a little close for it go to below without hitting something. I will let my guy know, how does your truck ride by the way? I see your a fellow 50 + plus guy, I'm on there also, one of my favorites, Thanks.

 

that's why i commented give a fellow 50 a hand i like it alot. i had a block from the original lift and this rides much better. i notice bumps and stuff while driving slow through town more but normal driving is much better. with the weight of your cap it should smooth that out also. it should tell you but from the center pin one side of the springs is longer than the other and i think the longer goes to the rear but you need to verify that. mine is a wheelerss leaf pack but they should be the same. i think you'll be pleasently suprised

 

Thanks again, I will call Marie at HeadStrong and have her walk me through it, see is really good.