NISSAN 4083 User Manual
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4
’98-’99 Frontier – Kit# 4083
made earlier. One by one remove each bed-mounting 
bolt. Remove bed-mounting bolts, one at a time, apply 
Loctite, reinstall bolt and tighten to vehicle torque 
specifications. 
WARNING
Failure to install the steering extension properly could 
result in loss of steering causing damage to the vehicle 
and possible personal injury. 
 
22. Install the steering extension into the lower coupler of 
the steering shaft. Be sure that the extension is installed 
so the mounting bolt will slide across the flat on the 
steering extension. Install the stock retaining bolt in the 
steering shaft. If the bolt will not easily slide across the flat 
on the steering extension, the extension has been 
installed incorrectly. Do not tighten the retaining bolt at 
this time. Extend the mark on the lower part of the 
steering shaft down onto the extension. Install the upper 
part of the steering shaft into the upper coupler inside the 
engine compartment. Be sure to align the marks made 
earlier. Install the stock retaining bolt in the upper coupler. 
Align the mark on the steering extension with the mark on 
the gearbox. Install the steering extension on the gearbox 
splined shaft. Install the retaining bolt in the steering 
extension. Do not tighten the retaining bolt at this time. Be 
sure that all marks are properly aligned and that there is 
ample engagement at all unions. 
 
23. Using the new lower radiator support as a template, 
Mark the lower core support for alignment of the new 
support. Align the holes in the new bracket with the stock 
mounting holes. Mark the core support for proper 
alignment of the new support after the stock mount has 
been removed. Using a die grinder or hacksaw cut away 
the bottom radiator mount from the core support. Be 
especially careful of the a/c condenser when cutting the 
sheet metal. Cut to the outside of each mounting hole 
approximately 1 ½” to 2” and flush with the vertical 
surface of the core support (allow enough room for the 
radiator to slide past the remaining sheet metal without 
hitting). Place the new lower radiator support bracket on 
the core support. Be sure that the bracket is aligned with 
the marks made earlier and that the bracket is positioned 
flush against the core support with the lip resting on top of 
the core support. Using the bracket as a template, mark 
the top of the core support through the holes in the 
bracket. Remove the bracket. Drill a ¼” hole at both 
locations. Mount the bracket to the core support by install 
a ¼” x 1” bolt with a ¼” washer through the bracket, and 
the core support. Install a ¼” washer and nylock nut on 
the bolt from the bottom of the core support. Tighten the 
¼” hardware securely. 
 
24. Install the radiator on the new lower support bracket. 
Remove the two rubber bushings from the plastic studs on 
the top of the radiator. Install the rubber bushings into the 
large hole in the 2” x 3” x 1” rectangular tube. Slide the 
tube with the rubber bushing onto the studs at the top of 
the radiator. Reinstall the stock upper radiator mount. The 
hole in the stock mount should align with the hole in the 
tube. Mount the tube to the stock bracket using a 3/8” bolt, 
two 3/8” USS washers, and a 3/8” nylock nut on each 
side. Do not tighten at this time. Be sure that the radiator 
is secure. Tighten all radiator mounting hardware 
securely. Install the fan shroud to the radiator using the 
stock hardware. Check the fan to fan shroud clearance. 
Be sure that the fan cannot make contact with the shroud. 
Tighten the fan shroud mounting hardware securely. 
Install both radiator hoses to the radiator. Tighten the 
hose clamps securely. 
 
25. Fill the cooling system as much as possible at this 
time. It will need to be topped off after the vehicle has 
been started. 
 
26. Reroute the vacuum brake-booster hose over the a/c 
hose at the firewall. Bend the bracket that mounts the a/c 
hose to the firewall forward to a 45-degree angle. This 
should give the hose ample slack. Reconnect the hose to 
the brake booster. If the line still feels tight, it may be 
necessary to carefully bend the steel portion of the line to 
gain more slack in the line. 
 
27. Check the a/c line at the core support. Be sure that 
there is enough slack in the line to remount it to the core 
support. If there is not enough slack, carefully bend the 
line to gain more slack. Be sure that there is ample slack 
in the line. Install the bolt that mounts the a/c line to the 
core support. Tighten securely. 
 
28. Using two 10mm – 1.25 x100 bolts with a 3/8” washer 
on each bolt, and the two 3” long tubes mount the cab 
safety loop to its original location. It may be necessary to 
bend the loop slightly to align the loop to the mounting 
holes with the spacer tubes installed. Tighten safety loop 
mounting bolts securely. 
 
WARNING
Use extreme caution when working near fuel lines and 
fuel tank. Clean up spilled fuel immediately. Any spark 
could cause an explosion or fire resulting in serious 
personal and property damage. 
 
29. Lengthen the fuel filler hose. Cut the filler hose toward 
the bottom below the first bend. Install the 1 3/4" fuel filler 
extension between the two sections of the filler hose. 
Install a #28 hose clamp at each end of the extension. 
Tighten both hose clamps securely. Remove the vent 
hose from the filler neck. Install the new vent hose to the 
filler neck vent. Install a #10 hose clamp and tighten 
securely. Install the filler assembly in the vehicle. Using 
the stock clamp, reconnect the filler hose to the fuel tank. 
Using a #10 hose clamp, reconnect the large vent hose to 
the fuel tank. Tighten all hose clamps securely. Install the 
screws that mount the filler neck to the body. Tighten