You may get a negligible amount of lift from new, gas charged shocks (maybe 1/4") when replacing worn out stock shocks...but you'll need springs to lift the rear 1.5".
the thing is your adding a spacer to bring it back up to the ride height you have before the bumper. so in essence your factory shock length would think it`s back to the factory ride height and perform as usual. But the problem I see is your really extending the ride height even tho the suspension is squishing from the added weight. so you should follow through with an extended length shock to play it safe or your shock will be the part that maxes out earlier when extending the suspension. Even though it is the shock being fully extended that raises the tire when you jack up your rig. follow me?
you could try just the spacers and see how it goes, but just imagine no added weight, you`d have no more rise or shock to extend with the OEM`s... or very little. the extended shocks would be a good measure.
also make sure when working back there to relax the ABS sensor wires/brackets and brake hose brackets until you put everything back together... your going to need it to droop a lot to get the spacers in and using a coil spring compressor.
all in all that should take care of your issue and ride well.
Edit: dumb post, thought this was about the front end.
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