What spindles lift did you do, how high ?
I installed a 4.5" SuperLift lift kit BUT deleted the OEM and the SL Blocks and used a set of the 6" SkyJacker Softride rear leafs ! The new leafs equaled the 4.5" lift, maybe a little more than that.
On my short bed std cab the leafs ride a little harder than I wanted but ok for now.
Oh ya, add a leafs do not always add lift to a truck...