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“In this issue, you will mount the two beams and another part of the rear section on the chassis, as well as one of the rear axle bars.”




Materials: The two Chassis Beams and the Right Rear Axle Bar are metal – the Section 3 part is plastic.


  • The Series – Goliath (Part 1)
  • Build Your KI.T.T. – Step by Step
  • Secret Files – Garthe Knight


Chassis Beam Assembly

Step 1

Retrieve your Chassis assembly from the previous stage. Fit the Left Rear Chassis Beam to the left rear underside of the Chassis, as shown.

The two Chassis Beams are marked L (left) and R (right) to help identify which is which:

Once this Left Rear Chassis Beam is fitted to the Chassis, it should look like this:

Step 2

Secure the Left Rear Chassis Beam into place from above with four (4) GM screws.

There are two screws at the front end of the Beam, and two more at the rear end. This is also your friendly reminder to try using 3-in-One Oil on all screws going into metal:

Step 3

In much the same way, fit the Right Rear Chassis Beam to the right rear underside of the Chassis, as shown.

Step 4

Secure the Right Rear Chassis Beam into place from above with four (4) GM screws:

Step 5

Fit the pin of the Right Rear Axle Bar into the forward (away from the Battery Compartment) of the two holes at this location on the Right Rear Chassis Beam:

Align the screw holes and secure the Right Rear Axle Bar to the Right Rear Chassis Beam with one (1) GM screw:

When fitted correctly, the long tab of this Right Rear Axle Bar should be perpendicular to the Chassis Beam, as shown:

Step 6

Fit the two pins of the Rear Chassis Section 3 into the matching holes on top of the left-rear corner of the Chassis.

On the real car, I believe this is the spare tire wheel well:

Secure this Section 3 into place from below with two (2) BP screws:


The original 80’s Pontiac Firebirds used in Knight Rider were of unibody construction, but these Chassis Beams represent the rear subframe section. I have to admit, after I struggled with the previous stages, this one was fun!

Next Up

 Stage 31 – Gearbox Rear Mount, Driveshaft/Protector, Universal Joints, Rear Brake Distributor, Fuel/Brake Lines

2 thoughts on “STAGE 30”

  1. Hi mate,
    My right and left chassis beam was bent horribly wrong and both protruded insanely far from the frame. At first I could barely get a screw in. Only gradually did I manage to get deeper into the screws bit by bit, until finally the last screw grabbed the first turn. That was really tricky work. Did yours fit well?
    Kind regards,

    1. Hello! Yes, my Chassis Beams fit fine once I realized how they matched up to the Rear Chassis. There was a bit of flex in the chassis that kept the rear end of the Beams from being close enough to drive a screw, but I just held the parts together with my hands until the screws were in, nothing crazy.

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