I am wanting to get 2.5'' more in the back of my truck, would I just need to get a 2.5'' block? I have ordered the Bilstien 5100 adjustable struts, and the rear have a 1'' lift compatible, would I need to get a strut extender also? thanks

 

Block size depends on 2wd or 4wd. If you have a 2wd then yea just a 2.5" block would work, if you have a 4wd it already has roughly a 2" block installed, so you would need to get 4-5" block to achieve your desired lift, I do not recommend stacking them. If the rear shocks are only compatible with 1" extra lift then yea I would recommend extensions, it would only matter under full flex.