MCG's drop spindles were not designed properly for the 2007+ Trucks, they had various complaints and balljoint issues. They just now redesigned it to properly fit.
The best ones are the Ground Force spindles, they were done right from the get go and come powdercoated black so they don't look nasty and rusty after a while.
Placed in recommended order by Brand
Front:
2" Coils - Ground Force, Belltech, MCG
2" Adjustable Struts - Belltech
2" Coil Relocation - MCG
2", 3" , 4" Control Arms - DJM
2" Spindle - Ground Force, Belltech, MCG
Rear:
2", 3" Shackles - Ground Force, Belltech, MCG, DJM (The 3" option is achieved by removing the factory block)
4", 5" Leaf Springs - Ground Force, MCG
7" Flip Kit - MCG, Belltech, DJM
Shocks:
MCG(New Design, requires shock extender), Belltech, Monroe Air Shocks
Anything after 7" in rear requires a C-Notch
Here was mine at 4/7 Ground Force up front and MCG/Monroe Air Shocks in rear.