OEM Chrysler 300 Rear Crossmember

Chrysler 300 Rear Crossmember Parts and Q&A

• Rear Crossmember
  4780800AA
  Q: How to install a Rear Crossmember on Chrysler 300?

  A:

  First, place the rear crossmember on a jack and then secure it. Fasten one side knuckle to the rear suspension crossmember, with the links and Parking Brake Cable included and hold it down with a nut and bolt, but don't tighten it yet. Do the steps above for the second side knuckle as well. Put nuts and bolts on each side of the crossmember for the tension links and compression links, but don't tighten them for now. Slide the toe link cam bolt through the crossmember and link, then put the washer and nut on it, holding the bolt from turning and again, do not tighten the nut at this point. Set up the spring links by bolting and attaching the nuts and push the rear parking brake cable through the crossmember brackets to secure it properly. Install the J-nuts and screws for the parking brake cable routing guide, next attach the stabilizer bar with cushions and retainers, but now attach the cushion retainer mounting bolts without tightening. Hook the stabilizer bar ends to the stabilizer links with bolts and nuts, just leaving them loose. Tighten the cushion retainer mounting bolts for 60N.m (44 ft.lbs). Secure the crossmember to the bushings first, with the differential mounting bolts assembly, then slide the entire unit under the new crossmember and insert these bolts from back to front. Adjust the crossmember, fit the body mounting points and spring links and affix the left bolts just to hold them in place for now. Slowly roll down the jack so Coil Springs can be installed and isolators are correctly placed. Fish the coil spring from its package and slide it into the spring pocket, then lift the jack and move it along until the bottom ring of the shock aligns with the spring link and makes contact. Put in the bottom shock mounting bolt and nut, but don't tighten them. If your vehicle has AWD, always place spacers on top of the right crossmember mount bushings before you raise the crossmember. Lift the crossmember to install the right mounting bolts and tighten them enough to be firm, but not so much that they're tight. Remove the bolts from the left coil spring mount and gently lower the jack to complete installation of the left spring and check the isolators are in place. Repeat the coil spring installation on the left side and after that, raise the crossmember on the left and add the left side mounting bolts, making sure they are not too loose. Line up the crossmember so the mounts fall where the body's stickers indicate and check that the space between the tension link and weld flange is at least 12 mm. Fasten all four crossmember mounting bolts to a torque of 180 N.m (133 ft.lbs.) and then remove the jack. Fix the fuel filler tube in place and attach the left rear wheel speed sensor cable's cable to the routing clips. Fasten the left and right parking brake cables together at the equalizer and then fit the J-nut onto the cable bracket for both cables. Place the routing bracket locating pin into the crossmember and screw it in place. Put a half shaft through the hub and bearing, then insert the hub nut without tightening it. After the rear axle differential is installed, apply 213 N.m (157 ft.lbs.) of torque to the hub nut and a helper should press the brake pedal. Fit the rear exhaust system and support the vehicle so that the front tires are on the floor, resting a jack stand below the rear suspension link. Screw up the camber link, tension link, compression link, spring link, Shock Absorber lower mounting bolt and stabilizer link bolts until they reach their recommended torque values. Jack the vehicle up, remove the jack stands, set the wheel and tire back on and tighten all wheel mounting nuts to 150 N.m (110 ft.lbs.). Set the vehicle low, link the negative terminal of the battery, push the brakes firmly, then do a wheel alignment and watch for the right thrust angle factor. Secure the toe link cam bolt nut to 108 N.m (80 ft.lbs.) by turning it while gripping the cam bolt to prevent movement.
• Rear Crossmember
  4780812AD
  Q: How to Service a Rear Crossmember on Chrysler 300?

  A:

  For the rear cross-member service, pull out the battery negative cable from the car, set the battery aside, raise the car and support it using an appropriate stand. Remove the wheel mounting nuts and tire and wheel assembly from all sides of the rear. After applying brakes to secure the hub, remove the nut from the half shaft on both sides of the axle. Followed by this, take off both the rear exhaust and the axle differential and pull the half shafts off each side of the car from the hub and bearing. Unplug the right rear Parking Brake Cable from the front parking brake cable and the left rear parking brake cable from the equalizer, but leave the equalizer with the front cable. Take out the screw holding the front parking brake cable routing bracket to the crossmember front flange and remove the J-nut from it. On cars using basic or superior Brake Discs, secure the tension pins so they do not move and remove the Brake Caliper bolt from the guide pins, guiding the brake caliper up via the suspension as you stow it above the rear suspension using a bungee wire or string. To keep caliper bores safe, insert pistons back with only a soft tool or trim stick. Between the SRT8 Brake Pad and the outer edge of the rotor, secure a trim stick, press against the brake pad to push the pistons down and support the spring link with a transmission jack to get at the caliper bolt. Remove both the upper and lower bolts holding the caliper, pull off the caliper with the brake pads and hang it out of your way. Disconnect both wheel speed sensor connectors from the body wiring harness connector in the floor pan of the luggage compartment, then remove the left wheel speed sensor from its routing clips behind the crossmember and above where the toe link is mounted. On each side, remove the shock absorber's lower bolts and nuts, mark out the four locations on the vehicle body where the rear crossmember fits and place jack stands under the front of the cradle to support it. Place a jack beneath the center of the rear crossmember, raise it to rest on the crossmember, lock it into place, but do not attach the stabilizer bar. Unhook the fuel filler tube and, if you own an AWD, do not misplace the spacers present between the crossmember mounts and the body as you remove the bolts. Disconnect the bolts on both the front and back mounts, let the crossmember sink gently and then work on the stop link and stabilizer bar when you can reach the bolts. Take off the bolts and nuts securely attaching the stabilizer bar to the stabilizer link. Then unscrew the bolts joining each stabilizer bar cushion retainer to the crossmember and remove them with the stabilizer bar cushions and retaining bolts together. Remove the Coil Springs and isolators from the spring links, then with a 13 mm 12-point box wrench, collapse each retainer's fingers and pull the brake cable out of its bracket. Untwist the screw holding the parking brake cable routing guide to the crossmember and release the J-nuts from there as well. Check which way the fasteners face before installation and then take out the bolts and nuts holding the spring link, toe link, tension link and camber link to the crossmember. Remove the crossmember from the jack last, lifting out the knuckle with links and parking brake cable connected to it from the rear suspension crossmember.