BMR Suspension KM008-1 User Manual

TUBULAR K-MEMBER AND A-ARM INSTALLATION INSTRUCTIONS

Part #’s: AA007, AA007K, AA008, KM006, KM006-1, KM007, KM007-1, KM008, KM008-1

While it is possible to perform this installation in the driveway, we consider it to be a moderate-to-difficult install. Professional
installation with a 4-post service lift is highly recommended.

• NOTE: This installation requires the removal of coil springs. Improper spring removal techniques can result in severe

injury or death. If you do not have experience in this area or feel uncomfortable with this installation, an experienced
technician is recommended.

• NOTE: If you are using our LS1 tubular K-member (Part #KM008, KM008-1) it is assumed that the original engine has

been previously removed and it is up to the installer to modify these instructions accordingly.

• NOTE: These particular K-members are not compatible with factory A-arms. Before proceeding with this installation, verify

that you have the correct part numbers for your application.

INSTALLATION:

1. Disconnect battery.

2. Lift vehicle and support with stands under the frame rails. Vehicle needs to be supported high enough to lower and install the

K-member. Remove both front tires.

3. Remove both cotter pins on the outer tie rod ends and loosen the castle nuts with a 19mm wrench. Knock the tie rod loose

and swing both tie rods out of the way.

4. Using a 13mm wrench and 13mm socket, remove both outer sway bar links and swing the sway bar down, out of the way.

5. Remove the cotter pin on the lower ball joint and loosen the castle nut using a 15/16” wrench. Loosen the nut until it is flu sh

with the top of the ball joint stud. DO NOT REMOVE NUT.

6. Using a pickle fork, break the ball joint loose from the spindle. Position a hydraulic jack under the A-arm and release tension

from the castle nut. Remove nut and carefully lower the A-arm, releasing spring tension slowly.

7. Using a large pry-bar, carefully pop the spring out of the A-arm pocket. Remove spring.

8. Repeat steps 5-7 on the other side.

9. Locate the brake lines in the outer wheel wells (See Image 1). Place a catch can and rags under the connection and loosen the

lines with a 12mm wrench. Using the same wrench, remove the two brake lines at the rear of the proportioning valve (See
Image 2). There is also one retainer that holds the rear brake line to the K-member. It is located directly below the master
cylinder and proportioning valve. Remove this retainer using a 10mm socket.

10. Using a 16mm wrench and an 18mm socket, remove both motor mount cross bolts.

11. Support the motor with a hydraulic jack or stand. Verify that the motor is stable before proceeding.

12. Remove all six K-member bolts using an 18mm socket. Using a 15mm socket, remove the front K-member triangular

supports that bolt to the frame rails.

13. Before lowering the K-member/A-arm assembly, make sure that all brake lines

have sufficient room to lower with the K-member. It may be necessary to bend
the brake lines slightly to simplify removing the K-member. Lower the K­member/A-arm assembly slowly being careful not to damage any of the brake
lines.

14. Using a 14mm socket, remove the factory motor mount “clamshells” and install

the BMR/Moroso clamshells (See Image 3).

15. Before installing the BMR K-member, it is necessary to determine which A-

arms you will be using. If using the factory springs, it is necessary to use BMR
A-arms (PART #AA008) and BMR Upper Spring Pockets (PART #USP001). If converting to a coil-over spring setup, it is
necessary to use the BMR A-arm Kit (PART #AA007K) or equivalent.

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TUBULAR K-MEMBER AND A-ARM INSTALLATION INSTRUCTIONS (CONT.)

16. If installing traditional springs, please proceed to step 17 below. If installing the BMR coil-

over setup or equivalent, it is necessary to use the 4 provided aluminum shim washers when
installing the K-member. Position one washer under each of the front 4 main K-member bolts
and install the K-member. Use the factory bolts in all locations except the middle, use the
provided bolt in this location. Install all bolts but do not tighten. Proceed to step 19.

17. When installing traditional springs, it is necessary to also use BMR upper spring mounts (Part

#USP001). These mounts are particular to each side of the car and install in between the K­member and the frame, essentially “sandwiching” the mount.

18. Position the mounts on top of the K-member in such a way that the spring seats angle outward.

Install the K-member (See Image 4). Use the factory bolts in all locations except the middle,
use the provided bolt in this location. Install all bolts but do not tighten.

19. Line up the motor mount holes and insert the cross-bolts. It may be necessary to lift or lower

the motor in order to line up the mounting holes. Tighten both cross-bolts. Tighten all 6 K­member bolts and torque to 130 ft/lbs.

A-ARM INSTALLATION FOR TRADITIONAL SPRINGS:

1. Lube the polyurethane bushings using the appropriate grease and install both A-

arms into the K-member. The sway bar mounts should point towards the front of
the car. Insert the provided mounting bolts and nuts but do not tighten.

2. Swing the A-arm up and position a hydraulic jack underneath the A-arm. Lift the

spring up and position it onto the upper spring pocket, allowing the bottom of the
spring to rest on the A-arm pocket. Using a long pry-bar, pry the spring until it
pops into position in the spring pocket. NOTE: It may be necessary to lift the A-

arm in order to get the spring pocket at the correct angle for the spring to pop into
place. With the spring in position, the end of the spring should butt up against the

stop in the spring cup.

3. Once the spring is seated properly in the cup, carefully lift the A-arm until the ball

joint seats into the spindle. Install the castle nut and tighten. Insert a new cotter
pin.

4. Repeat steps 1-3 for the other side.

5. Re-install the tie rod ends onto the spindles, tighten, and install new cotter pins.

6. Re-install the sway bar end links.

7. Remove the brake lines from the original K-member. With some slight

adjustment to the brake lines, they are compatible with the BMR K-member. Re­install the lines, mimicking their position on the stock K-member. Use the supplied zip-ties to hold the brake lines in
place. See Image 6 below for brake line routing.

8. Tighten all fittings and bleed the system.

9. Re-install both front tires and lower the car.

10. Tighten the A-arm bolts with the car lowered. Grease all fittings in the A-arms until grease protrudes from the bushings.

11. Grease both lower ball joints until grease protrudes from the dust boot.

12. Double-check all bolts for tightness. Double check all brake lines for clearance.

13. Connect battery and have suspension aligned.

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