i've had these helper level springs for a couple years in my garage because i never had a chance to install them. Today i was bored and had some time. My 2006 se 4x4 has prg shackles in the rear, 2.5" spacer in front with nismo shocks and springs all around. upon removing the rear wheel the leaf spring looked pretty flat. install was a simple u-bolt and nuts, line up everything and tighten everything. to my surprise the helper springs raised my truck .75" on both sides! not to mention i raised the level load capacity an extra 500 lbs. excellent so far, i'll post updates with a load as soon as i get a chance.
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