After all the problems think I found a solution to my problems.. Ready lift has the products that will allow me to keep the OEM suspension geometry.
"You also get bump stop extensions, brake line drop brackets AND most important, rear shock stem extensions that allow you to retain use of the TRD/Bilstein factory reservoir shocks! Here is a link to the product description.
https://www.readylift.com/blog/2016/09/23/readylift-all-new-product-release-toyota-tundra-trd-pro-plus-lift-kits-available-for-order/
It seems to me that a lot of forum members are jeopardizing the factory warrantee, ride quality and usability. (My opinion)
I will be looking into exactly what I will need to purchase that keeps the proper geometry, use the OEM shocks and still use my Shackles to lift the rear.