ROUGH COUNTRY 921731310 2.5 Inch Rear Coil Spring Kit Installation Guide

ROUGH COUNTRY 921731310 2.5 Inch Rear Coil Spring Kit

Thank you for choosing Rough Country for all your vehicle needs. Please read the instructions before beginning installation. Check the kit hardware against the kit contents shown below. Be sure you have all the needed parts and know where they go. If a question exists, please call us at 1-800-222-7023. We will be happy to answer any questions concerning this product. Check all fasteners for proper torque. Check to ensure adequate clearance between all components. Periodically check all hardware for tightness.

Kit Contents

• Coil Springs x2
• Rear Shocks x2
• Rear Trailing Arm Spacer x2
• Rear Subframe Spacer 1.25” x4
• Rear Subframe Spacer .25” x4
• Rear Subframe Support x2

TOOLS NEEDED

• Jack
• Safety Stands
• Wheel Chocks
• Pliers
• Metric Wrench/Socket
• 10mm
• 12mm
• 14mm
• 17mm
• 18mm
• 19mm
• 22mm

HARDWARE INCLUDED

• 10mm Stud Bag
• 10mm x 55mm Bolt x2
• 10mm Locking Nut x2
• 12mm x 35mm Bolt x2
• 12mm x 60mm Bolt x2
• 12mm Lock Washer x8
• 12mm Flat Washer x4
• 12mm Locking Nut x2
• 16mm x 80mm Bolt x2
• 16mm x 160mm Bolt x4
• 16mm Flat Washer x8
• 16mm Locking Nut x2
• Some hardware may not be used

Torque Specs

Size Grade 5 Grade 8 Size Class 8.8 Class 10.9

• 5/16” 15 ft/lbs 20ft/lbs 6MM 5ft/lbs 9ft/lbs
• 3/8” 30 ft/lbs 35ft/lbs 8MM 18ft/lbs 23ft/lbs
• 7/16” 45 ft/lbs 60ft/lbs 10MM 32ft/lbs 45ft/lbs
• 1/2” 65 ft/lbs 90ft/lbs 12MM 55ft/lbs 75ft/lbs
• 9/16” 95 ft/lbs 130ft/lbs 14MM 85ft/lbs 120ft/lbs
• 5/8” 135ft/lbs 175ft/lbs 16MM 130ft/lbs 165ft/lbs
• 3/4” 185ft/lbs 280ft/lbs 18MM 170ft/lbs 240ft/lbs

REAR INSTALLATION INSTRUCTIONS

1. Refer to instructions included in 501114 Loaded Strut box for front strut installation.
2. Remove the rear wheels/tires and set aside. Support the lower control arm with a jack.
3. Remove the upper shock from the wheel well using a 14mm socket. See Photo 1.
4. Remove the lower shock mount from the knuckle using a 22mm socket. Remove the shock from the vehicle and set aside. Remove the bolt next to the shock using a 19mm socket. See Photo 2.
5. Remove the ABS wire bracket from the trailing arm using a 12mm socket and let hang out of the way. See Photo 3.
6. Remove the rubber brake line from the trailing arm using a 14mm socket and let hang out of the way. See Photo 4.
7. When looking up at the trailing arm to the unibody mount, you will see the plastic tank cover extends over the innermost bolt. This will need to be trimmed out so that you can remove the trailing arm bolts and install the spacer. Mark the protruding piece of  the tank with a paint pen and using a suitable cutting tool, remove this section and discard. Thereis a wiring harness right behind this cover, make sure you do not cut into it. You can use a razor knife to cut this out using caution to not cut into the tank, wiring harness, or yourself. See Photo 5.
8. Remove the trailing arm bolts and lower the arm down. Install the trailing arm spacer between the unibody and the arm using the provided 12mm x 60mm bolts, lock washers, and flat washers. The “horseshoe” end will go towards the front of the vehicle. Torque to 75ft-lbs. See Photo 6.
9. Support the rear subframe with a jack. Starting on one side of the vehicle, loosen but do not remove the two cradle nuts on that side using an 18mm socket. On the opposite side, remove the nuts completely. See Photo 7.
10. Once the nuts are removed, you will be left with the stud that is screwed into the unibody. These will need to be removed and discarded using a 10mm socket. These will be replaced with new bolts later. See Photo 8.
11. Remove the cradle support from the unibody using a 10mm socket. Discard the brace but save the nut. See Photo 9.
12. Lower the cradle down low enough to install a 1.25” body puck spacer and a .25” thick cradle washer. You will install the cradle washer under the body puck spacer. See Photo 10.
13. Raise the cradle enough to hold it all in place. Install the new cradle support to the unibody using the factory nut using a 10mm socket and the supplied 16mm x 160mm bolt and flat washer using a 22mm socket. Do not fully tighten at this time. Repeat the cradle installation steps for the opposite side. Once all spacers have been installed, make sure the cradle is square under the unibody and torque the 16mm bolts to 165 ft-lbs, and the cradle support nut to 45 ft-lbs. See Photo 11.
14. Support the lower control arm with a jack. Remove the lower control arm to the knuckle bolt using a 14mm socket and wrench. Loosen but do not remove the lower control arm at the subframe. See Photo 12.
15. Remove the sway bar end link hardware from the lower control arm using a 14mm socket and wrench. Swing the sway bar up and out of the way. See Photo 13.
16. Lower the jack supporting the lower control arm slowly and remove the spring. Retain the upper isolator for reinstallation later. See Photo 14.
17. Install the new coil spring and raise the lower control arm to install the knuckle using the factory hardware. Do not tighten at this time. Reinstall the sway bar end links to the lower control arm using the factory hardware. Do not tighten at this time. See Photo 15.
18. Remove the upper shock mount from the OE shock and install it onto the new RC shock using the supplied hardware.
19. Install the shock on the lower mount using OE hardware. Then insert the upper shock assembly into the upper mount and tighten using the OE hardware. See Photos 16 and 17.
20. Lower shock shown installed. See Photo 17.
21. Reinstall the ABS wire bracket to the trailing arm using the factory hardware, 12mm socket, and torque to 5 ft-lbs. See Photo 18.
22. Install the rubber brake line to the trailing arm using the factory hardware while flipping the bracket upside down. Torque to 5 ft-lbs. See Photo 19.
23. Install the wheels/tires and lower the vehicle to the ground. Torque the lug nuts to the wheel manufacturer’s specs.
24. Roll the vehicle backward and forward a few feet to get the suspension to settle to the new ride height.
25. Torque the rear lower shock to 75 ft-lbs. Control arm to knuckle and subframe to 95 ft-lbs, the lower shock mount to 120 ft-lbs, and the sway bar end links to 75 ft-lbs.

By purchasing any item sold by Rough Country, LLC, the buyer expressly warrants that he/she complies with all applicable, State, and Local laws and regulations regarding the purchase, ownership, and use of the item. It shall be the buyer’s responsibility to comply with all Federal, State, and Local laws governing the sales of any items listed, illustrated, or sold. The buyer expressly agrees to indemnify and hold harmless Rough Country, LLC for all claims resulting directly or indirectly from the purchase, ownership, or use of the items.

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