Tuff Country 16710 - GM 73-87 6 1/2 ton box kit - Manual (Page 4)

passenger side. Set the stock sway bar/u-bolt plates aside.
6. Carefully lower down on both hydraulic floor jacks at the
same time allowing enough room for the new front springs to
be installed. Special note: Take special care not to over
extend the front brake lines.
7. Working on the driver side, remove the stock spring from
the stock location. The stock spring and hardware may be
discarded. Repeat procedure on the passenger side.
8. Locate the new front springs. Special note: The new
front springs need to be ordered as a separate part #. If
you have not already ordered your new front springs,
please contact Tuff Country or your local Tuff Country
dealer and order the new front springs. Part # for the
new front springs are 18670 (old part # is TCI-C6H).
Remove the bushings and sleeves from the new front
springs and add some lithium or moly base grease to the
bushings and sleeves and re-install them back into the new
springs. This will help prevent squeaking, the life of the bush-
ings and will also improve ride quality.
9. Working on the driver side, loosen but do not remove the
stock hardware that connects the stock shackle to the stock
frame rail. Repeat procedure on the passenger side.
10. Locate hardware bag GMSBNB1. Working on the driver
side, install the new springs into the stock location and
secure using the new hardware from hardware bag GMS-
BNB1. Torque the new 9/16” x 5 1/2” bolt and hardware to 95
ft lbs. Make sure to use thread locker or loctite. Special
note: at this time, do not torque the new 7/16” x 4” bolt
and hardware that connects the new spring to the stock
shackle, this will be done once the weight of the vehicle
in on the ground. Repeat procedure on the passenger side.
11. Carefully raise up on both hydraulic floor jacks at the
same time until they come into contact with the new front
springs. Special note: Make sure that the centering bolt
on the new springs fits properly into the stock spring
perches.
12. Locate (3) 5/8” x 3” x 7 5/8” round u-bolts and (1) 5/8” x
3 1/2” x 9 5/8” round u-bolt. Also, locate (8) 5/8” u-bolt high
nuts and (8) 5/8” u-bolt harden washers from hardware bag
58NW. Also, locate the stock sway bar/u-bolt plates. Working
on the driver side, secure the newly installed front springs to
the stock front differential using the new 5/8” x 3” x 7 5/8”
round u-bolts, hardware and the stock sway bar/u-bolt plate.
Tighten but do not torque the new u-bolts at this time.
Working on the passenger side, secure the newly installed
front spring to the stock front differential using the new 5/8”
x 3” x 7 5/8” round u-bolt, 5/8” x 3 1/2” x 9 5/8” round u-bolt,
hardware and the stock sway bar/u-bolt plate. Working in a
criss-cross direction, torque the new u-bolts on the driver
and passenger side to 110 ft lbs.
13. Locate hardware bag 10701NB. Working on the driver
side, install the new sway bar relocation bracket between the
stock sway bar mount and the stock “D” bushing. Secure
using the new 7/16” x 2 1/2” bolts and hardware. Do not
tighten at this point. Repeat procedure on the passenger
side. Move back to the driver side and add some thread lock-
er or loctite to the new hardware and torque to 42 ft lbs.
Repeat procedure on the passenger side. Special note: If
you are not able to perform this step with the weight of
the vehicle in the air, this step may need to be performed
once the weight of the vehicle is on the ground.