Tuff Country 13090 - GM 11-13 Silverado 3500HD 3.5 lift kit - Manual (Page 9)

new rear shocks. Tuff Country recommends install a 30”
fully extended nitrogen gas shock. Repeat procedure on
the passenger side.
34. Working on the driver side, remove the u-bolts from the
OE location and discard the u-bolts and hardware. Set the
lower u-bolt plate aside for later re-installation. Repeat pro-
cedure on passenger side.
35. Carefully lower down on both hydraulic floor jacks at the
same time approximately 2”. Special note: Take special
care not to over extend any brake lines and/or hoses.
36. Locate (2) new 1” lifted blocks. Working on the driver
side, install the new 1” lifted block into the stock location.
Repeat procedure on the passenger side.
37. Carefully raise up on both hydraulic floor jacks at the
same time until the spring assembly sits flush with the newly
installed 1” lifted block.
38. Locate (4) 3/4” x 3 1/4” x 16” square u-bolts. Locate (8)
3/4” u-bolt high nuts and (8) 3/4” u-bolt washers from hard-
ware bag 34NW. Also, locate the lower u-bolt plates.
Working on the driver side, install the new u-bolts into the
stock location and secure using the new 3/4” high nuts and
washers. Special note: If need be, cut off the excess
threads off each leg of the newly installed u-bolts.
Torque to 135 ft lbs. Repeat procedure on passenger side.
Special note: The OE shocks will be long enough once
this suspension system has been installed but Tuff
Country highly recommends replacing the rear shocks.
If you have not already ordered your rear shocks, please
contact Tuff Country or your local Tuff Country dealer
and order your new rear shocks. Tuff Country recom-
mends install a 30” fully extended nitrogen gas shock.
39. Working on the driver side, install the shock into the
lower location using the OE hardware. Make sure to use loc-
tite and torque to 85 ft lbs. Repeat procedure on the pas-
senger side.