its NOT TBSS springs guys its tb springs. The trailblazer ss came with rear airbags stock.
The djm 4 inch tb springs will sit a lot lower than the mcgaughys. For some reason the 00 up mcgaughys 5 inch spring sits a lot higher than the djm spring and sits higher than the belltech 4 inch drop spring.
the DJM tahoe 5 inch drop spring is the lowest ive installed then belltech 4 inch drop spring and then teh mcgaughys 5 inch drop spring..................but as for ride hands down the trailblazer djm 4 inch drop spring with djm shocks and the djm rear hardware kit rides better than anything out there. And yes ive installed all kits here locally on guys trucks.