Rough Country 390 User Manual
921390000
2003-13 2500/3500 Dodge Long Arm Upgrade
Thank you for choosing Rough Country Suspension for your Off Road needs.
Rough Country recommends a certified technician installs this system. In addition to these instructions, professional
knowledge of disassemble/reassembly procedures as well as post installation checks must be known. Attempts to
install this system without this knowledge and expertise may jeopardize the integrity and/or operating safety of the vehicle. Average professional install time for this kit is 2-3 hours.
Please read all the instructions before beginning the installation. Check the kit hardware against the kit contents list on
the last page. Be sure you have all the needed parts and understand where they go.
Product Use Information
As a general rule, the taller a vehicle is the easier it will roll. We strongly recommend, because of rollover possibility,
that the vehicle be equipped with a functional roll-bar and cage system. Seat belts and should harnesses should be
worn at all times. Avoid situations where a side rollover may occur.
Also check the steering stabilizer. It is a good idea when adding larger than stock tires to go with a larger bore steering
stabilizer or a dual unit for tires 35” and above. Inspect the stabilizer and replace as necessary.
Braking performance and capability are decreased when significantly large/heavier tires and wheels are used. Take
this into consideration while driving.
Do no add, alter, or fabricate any factory or after-market parts which increase vehicle height over the intended height
of the Rough Country product purchased. Mixing component brands, lifts, and/or combining body lift with suspension
lifts voids all warranties. Rough Country makes no claims regarding lifting devices and excludes any and all implied
claims. We will not be responsible for any product that is altered.
This suspension system was developed using a 5” Rough Country standard kit and upgrading it to a long arm kit. With
the new heavy duty y-link long arm setup your truck has a better ride, more articulation, and stronger control arms with
clevite bushings. Also included the heavy duty skid plate for added protection of the transfer case.
This kit can also be used a 3500 single rear wheel truck. Use of this kit on a dual rear wheel pickup is not recommended. Block and u-bolt combinations may vary with 3500 models.
On vehicles equipped with a two piece driveshaft & carrier bearing as on the Mega Cab, there is the potential
for take off vibration, depending on the severity this can be corrected with shimming down the carrier bearing.
Carrier bearing drop kit Part # 1110 is available from Rough Country.
Notice to Dealer and Vehicle Owner
Any vehicle equipped with any Rough country product must have the “Warning to Driver” decal installed on the sun
visor or dash. The decal is to act as a constant reminder for whoever is operating the vehicle of its unique handling
characteristics. INSTALLING DEALER—It is your responsibility to install the warning decal and to forward
these installation instructions to the vehicle owner for review and to be kept in the vehicle for its service life.
Tools Needed:
Heavy Duty Jack Stand
Floor Jack
Center Punch
13mm socket/wrench
18mm socket/wrench
19mm socket/wrench
21mm socket/wrench
24mm Socket/wrench
17/32 Drill Bit
15/32 Drill Bit
Die grinder with cut off wheel
Grinder
Hammer
Safety Glasses
22mm socket/wrench
FRONT SUSPENSION INSTALLATION
1. Secure and block the rear tires of the vehicle on a level concrete or asphalt surface
2. Raise the front of the vehicle and support the frame with jack stands. Position the jack under the axle to raise and
lower the front suspension.
3. On both sides of the vehicle, scribe alignment marks on the adjustment cam and axle bracket at the lower link to
axle attachment point for later reference.
4. Unbolt the brake line brackets from the control arm mount on the axle using a 13mm wrench to ensure brake line
free play during the suspension system installation. See Photo 1.
7. The new control arms will be installed one side at a time on the vehicle. This is done to make it easier to remove
the hardware from the arms and to not cause bind in the front suspension. Remove the lower suspension arm nut,
cam, and cam bolt from the axle using a 21mm and a 24mm socket and wrench. Remove the nut and bolt from the
frame attachment point and remove the lower suspension arm from the vehicle. See Photo 2. Retain hardware for
reuse.
Photo 1
8. Using a 21mm socket remove the upper control arm from the axle and frame. Note—the passenger side upper
control arm frame bolt will have to be cut or remove the exhaust before the bolt can be removed.
9. Use a cut off wheel on a die grinder and cut the welds around the lower control arm frame bracket. The frame
bracket has to be removed to allow clearance for the new longer arms. See Photo 3.
10. After the factory bracket has been removed grind the frame smooth and paint to prevent rust.
11. Support the transmission cross member with a jack and remove the two bolts on end with a 18mm socket and a
21mm wrench.
12. Install the new lower control arm mount with the supplied 14mm x 200mm long bolts. Do not tighten at this time.
Hold the bracket up close to the frame and use a transfer punch to mark the frame. See Photo 4. Drill the frame
with a 17/32” drill bit (clearance for the new 1/2” bolts). Remove the two bolts and the new control arm bracket
from the cross member.
Photo 2
Photo 3 Photo 4
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