While it may be possible to install this kit without removing the bed, it is recommended that you do so, as it is much easier. Support the front and rear of the chassis on jack stands. Be safe! Avoid pulling and pushing on the vehicle while it is off the ground. Remove the rear axle assembly, stock springs, shocks and brackets.
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To Disassembly Differential
Clamp the third member assembly in a vise and remove differential assembly as per instructions given before.
Clamp the differential in a vise gripping the outside of the differential case flange. .
Care should be taken to see that the vise does not mar the ring gear or squeeze the flange too tight.
Remove lock wire and differential case screws.
Lift off the differential case cover and the differential gears may then be removed.
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INSTALLATION NOTES
1. Unless specified, mount all Sub-Frame components to vehicle before tightening any bolts.
2. Vehicle should be parked on a level surface with the
front suspension normally loaded.
MOUNTING INSTRUCTIONS
1. Locate existing slotted holes in vehicle frame rails directly above front axle.
2. Install Mounting Bracket (#3)RH, using three (3) 5/8″ x 2″ Capscrews (#10) Washers, and Nylock Nuts provided.
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Installation Procedure:
1. Remove truck bed
2. Chalk front tires to ensure truck does not roll.
3. Jack rear of truck up at FRAME RAIL and secure with jack stand at REAREND. Duplicate on both sides. Remove wheels, shocks, sway bar and mounts. When finished rear of truck should be suspended by 2 jack stands on axle with wheels removed and suspension STILL INTACT.
4. Using FRAME SECTION as guide, place FRAME SECTION next to outside of truck frame rail to check for clearances of rivets, tabs, and brackets etc. that will impede the FRAME SECTION from sliding onto frame rail.
5. Remove and/or relocate any rivets, tabs, brackets etc.
6. Slide FRAME SECTION over frame rail into place, it will be a tight fit and usually will need help with a mallet to knock onto frame rail.
7. Repeat steps 4 through 6 on opposite side.
8. With FRAME SECTION in place mount REAR CROSS MEMBER to top rear of notch next to upper bag placement. Loosely bolt REAR CROSSMEMBER in place to allow movement.
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Instructions:
1. Remove the stock GM 245mm impeller hub by boring a 3.380″/3.385″ diameter hole on center in the stock GM 245mm impeller (see Figure 1).
2. Install the Sonnax CH-90CM-27 impeller hub from the outside. Weld around the OD of the impeller hub, making sure it is centered in the impeller. This weld must be leak-proof (see Figure 2).
3. Once the impeller hub is fitted, fixture the impeller assembly in the lathe. Turn the lip of the impeller so that it is 3.80″ from the end of the impeller hub. Then turn the OD down to 10.150″/10.145″ diameter, .40″ from the end (see Figure 3).
4. Install the adapter ring on the impeller assembly as shown in Figure 4 and weld around the OD of the impeller. This weld must be leak-proof.
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1. Raise and support vehicle at a safe, comfortable working height. Let the front suspension hang freely.
2. Remove coil spring, shock absorber, and bump stop. Refer to factory service manual for proper disassembly procedure.
3. A portion of the frame must be trimmed to clearance for the air spring. Mostly to the outside of the pocket but some must be done to the inside as well.
4. Apply thread sealant to a straight air fitting and screw it into the top of the air spring.
5. Place the upper air spring bracket on top of the air spring and fasten with two 3/8” Nyloc nuts and flat washers.
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1. Raise and support vehicle at a safe, comfortable working height. Let the front suspension hang freely
2. Remove oem coil spring and shock absorber. Refer to factory service manual for proper disassembly procedure.
3. Remove the factory shock nut from the top of the lower control arm. This is best done with a chisel and then ground smooth.
4. The factory bump stop must also be removed. It has a nut on the bottom of the arm.
5. The upper coil spring retainer needs to be taken out as well. It is secured with rivets that need to be ground down or drilled out from the top. Some cars may have bolts instead of rivets. Note: If this is not done the top of the Shockwave will come in contact with the retainer and permanently damage the Shockwave.
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1. Start by supporting the car on 4 jack stands. The car should be sitting on approximately the same angle as it does on the ground, or slightly lower in front.
2. Remove all the old front suspension components. Note that on the underside of the frame are the two rubber axle snubbers (or the holes for them, if they are missing) directly above the axle. Mark them for later reference.
3. We would recommend that at this point, you tack weld or clamp a temporary brace across the frame rails in front of the old crossmember as shown in
Figure 1. This helps to maintain the rail dimension after the old crossmember is removed.
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1. Start by supporting the car on 4 jack stands. The car should be sitting on approximately the same angle as it does on the ground, or slightly lower in front. (If you are using a new pair of boxed frame rails, you can skip to step 5.)
2. Remove all the old front suspension components. We would recommend that at this point, you tack weld or clamp a temporary brace across the frame rails in front of the old crossmember as shown in Figure 1. This helps to maintain the rail dimension after the old crossmember is removed. Lastly, remove the old crossmember by drilling out the rivets.
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