ROUGH COUNTRY F-150 Tremor 4 Lift Kit

Product Information

• Product Name: FORD 2021-22 F-150 Tremor 4 Lift Kit
• Product Code: 921407300
• Manufacturer: Rough Country
• Recommended Installation: Certified technician

Product Usage Instructions

1. Please read the instructions provided in the user manual before starting the installation process.
2. Check the kit hardware against the parts list to ensure you have all the necessary components.
3. Review the tools needed list and make sure you have the required tools.
4. For safety reasons, it is strongly recommended to wear seat belts and shoulder harnesses at all times due to the possibility of rollovers.
5. Take into consideration that braking performance and capability may be decreased when using larger/heavier tires and wheels.
6. Avoid adding, altering, or fabricating any factory or after-market parts to increase the vehicle’s height beyond the intended height of the Rough Country product.
7. It is not recommended to mix component brands.
8. Ensure that all tire and wheel combinations, especially oversized or wider than stock tires, are tested before installation.
9. Use a minimum 20″ wheel with a corresponding tire, 9″ in width, and an offset of 6mm.
10. Prior to installation, disconnect the EPAS (Electronic Power Assist Steering) plugs as instructed in the installation manual to avoid damage to the EPAS module.
11. Install a Warning to Driver decal on the inside of the windshield or the vehicle’s dash to remind the driver of the vehicle’s unique handling characteristics.

THANK YOU FOR CHOOSING ROUGH COUNTRY FOR YOUR SUSPENSION NEEDS.
Rough Country recommends a certified technician install this system. In addition to these instructions, professional knowledge of disassembly/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. Please read the instructions before beginning installation. Check the kit hardware against the parts list. Be sure you have all the needed parts and know where they go. Also please review the tools needed list and make sure you have the needed tools.

PRODUCT USE INFORMATION

WARNING: The taller a vehicle is, the easier it will roll. We strongly recommend, because of the rollover possibility that seat belts and shoulder harnesses should be worn at all times. Avoid situations where a side rollover may occur.
WARNING: Generally, braking performance and capability are decreased when larger/heavier tires and wheels are used. Take this into consideration while driving. Do not add, alter, or fabricate any factory or after-market parts to increase vehicle height over the intended height of the  RoughCountry product purchased. Mixing component brands is not recommended. Rough Country makes no claims regarding lifting devices and excludes any and all implied claims. We will not be re-sponsible for any product that is altered. If questions exist we will be happy to answer them concerning the design, function, and correct use of our products. The 4” suspension system was developed using a 35X12.50/20 tire with 20 x 9 wheels with 6mm offset. The lifts were designed to lift the front to level the vehicle. Due to manufacturing, dimension variances, and inflation, all tire and wheel combinations should be tested prior to installation on all oversized / wider-than-stock tires. We recommend using a 20” minimum wheel with a corresponding tire, 9″ in width with an offset of 6mm.
NOTICE: Vehicles will require the EPAS (Electronic Power Assist Steering) plugs to be disconnected prior to beginning installation of this kit. See installation instructions. Failure to disconnect these plugs may result in damage to the EPAS module resulting in an error message being displayed, which will require the replacement of the EPAS module
NOTICE: DEALER AND VEHICLE OWNER
Any vehicle equipped with any Rough Country product should have a “Warning to Driver” decal installed on the inside of the windshield or on the vehicle’s dash. The decal should act as a constant reminder for whoever is operating the vehi-cle of its unique handling characteristics.

Tools Needed

• 5mm Allen Wrench
• 8mm Allen Wrench
• 8mm wrench /socket
• 10mm wrench /socket
• 12mm Wrench
• 13mm wrench/socket
• 15mm wrench /socket
• 16mm wrench /socket
• 18mm wrench /socket
• 19mm wrench /socket
• 21mm wrench /socket
• 22mm wrench /socket
• 24mm wrench /socket
• 30mm wrench /socket
• Floor Jack
• Jack stands
• Reciprocating Saw
• Hammer
• 9/16 wrench /socket
• 1 1/16” Wrench
• Drill
• 1/4” Drill Bit
• 5/8” Drill Bit
• 11/32” Drill Bit
• Torque Wrench

Torque Specs

• Size Grade 5 Grade 8
• 5/16” 15 ft/lbs 20 ft/lbs
• 3/8” 30 ft/lbs 35 ft/lbs
• 7/16” 45 ft/lbs 60 ft/lbs
• 1/2” 65 ft/lbs 90 ft/lbs
• 9/16” 95 ft/lbs 130 ft/lbs
• 5/8” 135 ft/lbs 175 ft/lbs
• 3/4” 185 ft/lbs 280 ft/lbs
• Class 8.8 Class 10.9
• 6MM 5 ft/lbs 9 ft/lbs
• 8MM 18ft/lbs 23 ft/lbs
• 10MM 32ft/lbs 45ft/lbs
• 12MM 55ft/lbs 75ft/lbs
• 14MM 85ft/lbs 120ft/lbs
• 16MM 130ft/lbs 165ft/lbs

4” KIT CONTENTS

• 40730 (4” Kit w/ N3 Shocks):
  • 40730BOX3
  • 40730BOX5
  • 555BOX3
  • 40730BOX1
  • 587BOX2
  • 23165
• 40770 (4” Kit w/ V2 Rr Shocks):
  • 40730BOX3
  • 40730BOX5
  • 555BOX3
  • 40730BOX1
  • 587BOX2
  • 760751
• 40730BOX3
  • U-Bolts x4
  • 9/16BAG
  • 3” Dual Pin Block x2
• 40730BOX5
  • 1557BAG15 x1
  • 1557BAG8 x1
  • 40730BAG1 x1
  • 587BAG1 x1
  • Cam Bolt Set x4
  • Front Diff Bracket x1
  • Dr Rear Diff Mount x1
  • Front Pass Diff Bracket x1
  • Pass Diff Brace x1
  • Driver Sway Brar Drop x1
  • Pass Sway Bar Drop x1
  • Sway Bar Drop Bracket Badge x2
  • Front Skid Plate x1
• 555BOX3
  • 4” Strut Spacer x2
  • 10mmStudbag-2
• 40730BOX1
  • Tremor Front Crossmember x1
  • Tremor Rear Crossmember x1
• 587BOX2
  • Driver Knuckle x1
  • Pass Knuckle x1
• 23165
  • N3 660751 x2
• 760751
  • V2 Shocks x2
• 1557Bag15 Containing:
  • For Pass Diff Brace:
  • 12mm x35mm x2
  • 12mm Lock Nut x2
  • Flat Washers x4
• 1557Bag8 Containing:
  • For Fr Dr Side Upper Diff Mount:
  • 3/4 Flat Washer x4
  • 1/2” Nylock Nut x1
  • 18mm-2.5 Nylock Nut x2
  • 9/16-12 Nylock Nut x3
  • 1/2-13 x1.5 Hex Head Nut x1
  • 9/16-12 x4 Hex Bolt x3
  • 18mm-2.5 x150 x2
  • 9/16 Flat Washer x6
  • 1/2” Flat Washer x2
• 40730BAG1 Containing:
  • For Rear Bump Stop:
  • 10mm-1.5 x 60mm Bolts x2
  • Bump Stop x2
• 587BAG1
  • 3/8” Washer x9
  • 3/8-16 x1” Hex Head Bolts x6
  • 3/8-16 Nylock Nuts x3
  • 5/16 Flat Washer x4
  • 5/16-18 x3/4 Hex Head Bolts x2
  • 5/16-18 Nylock Nuts x2
  • 5/16” Vent Hoes Coupler x1
  • 5/16 x4” Vent Hoes x1
  • 7/16-14 x1.25 Hex Head Bolt x4
  • 7/16-14 Nylock Nut x4

  • 8-32 x1/2 SS Button Head Bolt x 4

  • 8-32 SS Lock Nut x4

  • Brake Line Bracket x2
• 10mmStudBag Containing:
  • For Front Strut Spacers:
  • 10mm Studs x6
  • 10mm Lock Washer x6
  • 10mm Hex Nuts x7
  • 1/2” Jam Nut x1
  • 3/8” Flat Washers x6
  • 9/16Bag:
• For Rear Blocks:
  • 9/16” Nuts x8
  • 9/16” Flat Washers x8

4” N3 Kit Shown in Picture

INSTALLATION INSTRUCTIONS

1. Chock the rear wheels and jack up the front of the vehicle.
2. Place jack stands under the frame rails and lower onto jack stands.
3. Remove the wheels/tires using a 21mm socket.
4. Remove the skid plate with a 13mm socket. See Photo 1.
5. Remove the EPAS (Electronic Power Assist Steering) Plugs as shown located on the steering assembly by the front differential. See Photo 2. This must be done BEFORE installation is started.
6. Remove tie-rod end using a 21mm wrench. Using the appropriate tool remove the tie-rod from the knuckle. Photo 3.
7. Remove the ABS and brake line bracket from the knuckle using a 8mm wrench for the ABS wire and a 10mm wrench for the brake line bracket. Retain hardware for reuse. See Photo 4.
8. Remove the vacuum line from the hub. See Photo 5.
9. Using a 19mm socket or 21mm socket, remove brake caliper as shown in Photo 6. Hang caliper out of way. Do not let caliper hang by brake hose as this will damage hose. Retain hardware for reuse. Remove rotor.
10. Remove the dust shield using a 8mm socket and dust cap. See Photo 7.
11. Remove the ABS wire from the bearing assembly using a 5mm allen wrench. See Photo 8.
12. Remove the axle nut using a 15mm socket. Retain hardware for reuse. See Photo 9.
13. Loosen the upper ball joint nut using a 21mm wrench. Use the appropriate tool to release ball joint from knuckle. See Photo 10.
14. Loosen the lower ball joint using a 24mm wrench. Use the appropriate tool to release the ball joint from the knuckle. See Photo 11.
15. Remove the upper and lower ball joint nuts and remove the knuckle from the vehicle.
16. Remove the sway bar links from the sway bar using an 8mm and 19mm wrench. Retain hardware for reuse. See Photo 12.
17. Remove the lower strut nuts using an 18mm socket. See Photo 13. Retain hardware for reuse.
18. Remove the sway bar from the frame mount using a 15mm socket. Please note the position that the sway bar is in-stalled from the factory to make sure it is reinstalled correctly. Retain hardware for reuse. See Photo 14
19. Remove the lower control arm using a 21mm and 1-1/16” wrench. Retain hardware for reuse. See Photo 15.
20. Remove the strut from the upper mount using a 15mm socket/wrench. Retain hardware for reuse. See Photo 16.
21. Remove the lower skid plate if equipped by removing the 4 bolts using a 13mm socket. See Photo 17.
22. Remove the driveshaft from the front differential using a 10mm socket. See Photo 18. Secure driveshaft out of the way.
23. 23. Remove the stock rear cross-member using a 15mm & 18mm socket. Retain hardware for reuse. See Photo 19.
    • NOTICE: 2018 Models will have to make rear cross member mount cuts in steps 26-30 before removing the differential.
24. Support the differential using a floor jack and remove the upper driver-side differential bolt using an 18mm wrench. Retain hardware for reuse. See Photo 20.
25. Remove the differential vent tube from the differential.
26. Remove the passenger side differential bolt using an 18 & 21mm wrench. Retain hardware for reuse. See Photo 21.
27. Remove the lower rear driver-side differential bolt using a 21mm socket/wrench. Lower and remove the differential from the vehicle. Tape-supplied cutting template on front and back side of the driver side lower cross-member mount. Using the template as a guide, trim the cross-member mount to allow the differential to be removed. See Photo 22.
28. Tape supplied cutting template on front and back side of the driver side lower cross-member mount. Using template as a guide, trim cross-member mount to allow the differential to be removed. See Photo 23.
29. Complete the trimming of the frame on the driver side using the template. See Photo 24.
30. Install the new bracket on the passenger side diff mount with the supplied hardware. Install the 9/16” x 4” bolt, wash-ers & nut in the in the passenger side mount. Do not tighten at this time. See Photo 25.
31. Install the front driver side diff mount with the supplied 9/16” x 4” bolt, washers and nut from the front to rear.
    • NOTE: The differential mount bolts will need to be inserted from the front of the differential in or-der to clear the rack and pinion. Do not tighten at this time. See Photo 26.
32. Install the rear diff mount using the supplied 9/16” x 4” hardware. Do not tighten at this time. See Photo 27.
33. Raise the differential into place and install the upper differential bolts using the stock hardware. See Photo 28. Do not tighten at this time.
34. Install the sway bar drop brackets using factory hardware. Do not tighten at this time.
35. Install the rear cross-member with the supplied 18mm x150mm bolt. The bolt will install through the sway bar bracket and rear cross-member, securing it to the stock location. Do not tighten at this time. See Photo 29.
36. Install the passenger side differential brace as shown in Photo 30 using the supplied 12mm hardware in 1557BAG15. Do not tighten at this time.
37. Install the rear drivers side diff mount. Use the factory bolt in the top mount and the supplied 1/2” hardware in the crossmember mount. Torque the factory bolt to 90ft-lbs and the 1/2” hardware to 90ft-lbs. See Photo 31.
38. Tighten the (3) 9/16” x4” differential bolts. Torque to 100ft/lbs with a 21mm socket and 22mm wrench. See Photo 32.
39. At this time tighten the (3) upper factory diff bolts. Torque to 90ft-lbs. using 18mm socket and wrench. Torque the lower 9/16” x4 hardware to 100ft/lbs using a 21mm & 22mm socket and wrench. Also torque the passenger side diff brace hardware to 55ft/lbs using a 19mm socket & 18mm wrench.
40. Tighten the sway bar drop mounts to the frame. Torque nuts to 35ft-lbs. using a 15mm socket. See Photo 33.
41. Reinstall the vent tube on the differential with the newly supplied vent tube extension 1557BAG13.
42. Install the front cross-member using the factory hardware. See Photo 34. Do not tighten at this time.
43. lower control arms using the supplied 18mm x 160mm cam bolts, washers, and nuts. See Photo 35. Do not tighten at this time.
44. Install the new skid plate in the rear cross-member threaded holes using the supplied 3/8” x 1” bolts, and washers. Attach to the front cross member using the supplied 3/8” x 1” bolts, washers and nylock nuts from 1557BAG13. See Photo 36. Torque using a 9/16” socket and wrench to 30 ft-lbs.
45. Tighten all upper cross-member bolts. Torque to 190 ft-lbs using a 21mm, 1 1/16” socket and 1 1/16” wrench.
46. Install the drive shaft spacer with supplied 10mm x 85mm hardware. See Photo 37. Torque to 35ft-lbs. using a 8mm allen.
47. Using a 10mm wrench remove the brake line bracket from the driver and pass side frame. See Photo 38.
48. On the passenger side remove the brake line from the two factory clips. See Photo 39.
49. Install the new brake line bracket on the driver and passenger side with the stock hardware. See Photo 40.
50. Install the factory passenger side brake line in the new bracket using the supplied 5/16’ x 3/4” bolt, washer, and nuts. Take care to not kink the brake line. See Photo 41.
51. On the driver’s side, pull slightly on the brake line to allow the line to be installed on the new bracket. Secure the brake line to the new bracket with the supplied 5/16” x 3/4” bolt, washers and nut. Take care to not kink the brake line.
52. Using a 13mm socket/wrench, torque the supplied brake line bolts to 15 ft-lbs. Torque stock hardware to 18ft-lbs.
    • NOTICE: If installing new lifted struts or Vertex coilovers, follow the supplied strut instructions and skip to step 56.
53. Install the supplied 10mm studs in the strut spacers with a 17mm wrench, using the 1/2” jam nut as a spacer. See Photo 42.
54. Using the stock hardware, install the strut spacers on the struts. Torque to 45ft-lbs. using a 15mm. See Photo 43.
55. Install the strut with strut spacers installed in the stock upper mount. Secure with supplied 10mm nuts, washers and lock washers. See Photo 44. Do not tighten at this time.
56. Install the lower strut in the lower control arm using the factory hardware. Torque using a 18mm socket.
57. Torque upper strut mount hardware using 17mm wrench.
58. Install the sway bar on the sway bar links located on the lower control arms. Install nut to hold the sway bar in place but do not tighten at this time. See Photo 45.
59. Swing up the sway bar and install on the sway bar drop brackets using the supplied 7/16” x 1” bolts, washers and nuts. Torque to 45ft-lbs. using a 5/8 wrench and socket. Torque the swat bar links to 18ft-lbs. using an 18mm socket. See Photo 46.
60. Remove the stock bearing assembly from the stock knuckle using a 18mm for the bearing and a 8mm for the locking hub mechanism. Install the bearing assembly on the lifted knuckle using the stock hardware. Torque to 160ft-lbs. using a 18mm wrench. See Photo 47.
61. Install the new knuckles using the stock hardware on the lower ball joints, tighten using 24mm and a 12mm wrench. See Photo 48. Final torque to 110ft-lbs. using a torque wrench. Do not use air impact on the upper and lower ball joint, tighten with hand tools.
62. Install axle nut and torque to 30ft-lbs. Do Not Use an impact, caution must be taken or damage to shaft may occur. See Photo 49.
63. Install the ABS wire on the bearing assembly, torque to 8 ft-lbs. using a 5mm Allen. See Photo 50. Install the fac-tory dust shield on the supplied knuckle, using factory hardware. torque to 14ft-lbs. use a 8mm socket.
64. Install the caliper to the knuckle with the stock hardware, Torque to 140ft-lbs. using a 21mm socket. See Photo 51.
65. Make sure the ABS wire are out of harms way. Using a zip tie, secure the and ABS wire to the knuckle neck.
66. Install the tires and wheels using a 21mm socket. Remove the jack stands and lower the truck to the ground.
67. Tighten the lower control arm bolts using a 1-1/16” wrench and socket. Torque to 240 ft/lbs.

REAR INSTALLATION

1. Chock the front tires and jack the rear the rear end up. Put jack stand under the frame rail and lower truck onto jack stands.

2. Remove tires and wheels using a 21mm socket.

3. Remove rear shocks from the upper and lower mount using 18mm and a 15mm wrench. See Photo 1 & 2. Retain the stock hardware.

4. Using a 10mm wrench, remove the brake line assembly on the inner driver side frame rail. See Photo 3.

5. Install the brake line assembly to the new bracket using the supplied 3/8” x 1” bolt, washers and nut. Torque to 30ft-lbs. using a 9/16” socket and wrench. See Photo 4.

6. Install the brake line extension bracket on the frame using the stock hardware and torque to 18ft-lbs. using a 10mm socket. See Photo 4.

7. Remove the e-brake cable mount with a 10mm wrench as shown on the drivers side as shown in Photo 5.

8. Install the supplied e-brake bracket with the factory hardware. Torque to 10ft-lbs. use a 18mm wrench. See Photo 6.

9. If equipped install the e-brake cable mount to the new e-brake drop bracket using the supplied 5/16” bolt, washers, and lock nut, torque to 15ft-lbs. using a 1/2” wrench and socket. See Photo 7.

10. Using a jack support the rear end remove U-bolts using a 21mm socket and remove the factory blocks. See Photo 8.

11. Install the supplied blocks on the block pin holes on the axle and raise the axle into place. See Photo 9.

    • Note- Taller end of the block to the rear of the truck!

12. Install the U-bolts, bottom plate, washers, and nuts. torque to 90 ft-lbs. using a 22mm socket.

13. Remove the bump and stop using a 15mm socket. See Photo 10.

14. Locate the spacer and 10mm x 60mm hex head bolt. See Photo 11.

15. Place the spacer in between the bump stop and the frame. Then secure using the 10 x60mm hex head bolt. Tighten using a 17mm socket. See Photo 12.

16. For V2 rear shocks and Vertex rear shocks follow the shock installation instructions included in the shock package and skip to step 17.

17. Install the new shock absorbers in the upper and lower mounts using the stock hardware. Torque to 55ft-lbs. using an 18 and 15mm wrench. N3 shocks will mount with the body down.

18. Install the rear tire and wheels.

19. Raise up the rear of the vehicle and remove the jack stands. Lower the vehicle to the ground.

CUTTING / DRILLING

CUTTING / DRILLING TEMPLATE—FR SIDE OF DRIVER CROSSMEMBER

CUTTING / DRILLING TEMPLATE—REAR OF DRIVER SIDE CROSSMEMBER

POST-INSTALLATION INSTRUCTIONS

1. Check all fasteners for proper torque. Check to ensure there is adequate clearance between all rotating, mobile, fixed, and heated members. Check the steering gear for interference and proper working order. Test brake system
2. Perform steering sweep. Check to ensure brake hoses have sufficient slack and will not contact rotating, mobile, or fixed members, and adjust lines/brackets to eliminate interference and maintain proper working order. Failure to perform inspections may result in component failure
3. Readjust headlights to factory settings
4. Have the vehicle aligned by a certified alignment professional.
5. Re-torque all nuts, bolts, and especially u-bolts after the first 100 miles, again after another 100 miles, and then check periodically thereafter
6. All components must be retightened after 500 miles, and every three thousand miles after installation.

Thank you for purchasing a Rough Country Suspension System
By purchasing any item sold by Rough Country, LLC, the buyer expressly warrants that he/she is in compliance 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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