ReadyLIFT Z-71 GMC Sierra 1500 SST Lift Kit, 2007-2013, 4WD, 2.25F/1.75"R w/ Uniball Control Arms" - Manual (Page 11)

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Installation Instructions 69-3488
11
Revised Feb-2014
While supporting the axle, remove the u-bolts from axle. Lower the axle and remove the factory block, do not reuse.
Lower the axle more in order to install the new lift block. Raise the axle, align and attach the new u-bolts and hardware.
Re-install the shock with the extension attached and tighten. Lube the ABS wire and slide the rubber mount to gain more slack.
Attach the ABS wire to the u-bolts with the provided zip ties. The differential brake line bracket may require bending up. 60.
58. 57.
56. 55.
54. 53.
59.