New Owner - Suspension question (I know)

I just bought a 2008 TRD Sport and couldn't be happier. I've been lurking here for a few weeks and have already used your collective knowledge to fix my broken Compass/Thermometer, locate and change my cabin filter and secure my tailgate. Thanks!

My truck had an open recall on the rear lift springs so I took it to Mark Miller in SLC and they put on much beefier ones free of charge. Very happy with the new rear suspension.


I decided to replace/upgrade the shocks from the stock HD Bills to 5100s and the ride is night and day. Love it.

One question I have for you all is this: The previous owner put a lift block on the rear of the car and the dealer didn't remove it when adding the new leafs and shocks. Should they have done that? I am very, very new to 4x4 ownership so bear with me please. There is a 'slight' lean back in the truck in the current state. I'm just wondering if I'm losing anything in travel with the block in there. Thanks in advance for you feedback!