Factory rake with 4 inch Pro Comp lift or replace with 6inch lift?

I am a complete newb when it comes to suspension so be easy with me. I've tried to search but could not find what I an looking for. So I have a 4 inch Pro Comp lift on my 4x4 Tundra and am interested in raising the rear a little so it has more of a factory rake to the stance. Is this even possible with either some shackles or different shocks in the rear? Or would I need to get the whole 6 inch kit and replace the 4 inch with it? I've emailed Pro Comp last week and they have not responded yet. Would some shackles from @Coachbuilder1 work for this purpose or is that considered stacking lifts?

 

I'd think you could just add shackles with a leaf pack and get whatever amount of lift you want. It's not considered stacking lifts.

 

Im getting a 6in installed right now actually and I hear your concern. It's not considered stacking if you add shackles. For my 6in procomp they put a 3 in block and AAL in the rear. If it isn't level I'm gonna go with a shackle as well. Coachbuilder is good but depending on how much you want to raise it id go with a toytec shackle. It's adjustable from 1 in to 1 1/2 in 1/4" increments

 

Here is what is on it now.
So its possible to just add the shackles and be done with it then? Would adding shackles require a re alignment as well?

 

Nope adding shackles should not require an alignment. How much are you looking to raise the hind end?

 

Probably around 1 or 1.5 inches. Does anyone know what the factory rake is?

 

My truck was 1 1/4" higher in the rear

 

http://toyteclifts.3dcartstores.com...table-1-15-Lift-Shackles-07Tundra_p_1579.html

Easy install by yourself.

 

Good to here! Sorry for my ignorance, but what purpose do the lower bushings serve? Would I need those as well?

 

Yes i would get them. They are just better quality then the stock ones we have.

 

Does anyone know if I can add Bilstein 5100s at the middle setting in the front for an additional inch lift? The 4inch pro comp utilized the factory front shocks and i'm looking to replace them. If I can add an inch or so up front with just new shocks I might go that route and the shackles in the rear.