I've been out of the loop for years but here's a stab at who makes what.
Dencar used to make most of the Holden roll cages and chassis, but a few of the teams have taken that inhouse now to try and get a slight advantage in torsional rigidity and there is bugger all chassis left anyway.
The Commodore is shortened (the real car is too long for the regs) the body dropped lower over the floor pan, the pan is tubbed for the big wheels/tyres, etc.
Gearbox = Holinger (same box and ratios for both makes) dog engagement, straight cut gears and now sequential change.
Typical race car 'box.
Rear end = Harrop, using a racing Ford 9" style CWP.
Nothing Ford about the diff anymore, hasn't been for 30 years, but that's still what they are known as.
Hubs all round are Harrop (i think) on both makes.
Rear end is adjustable for castor and toe (CV in hub, even though solid axle)
Most Holden runners use a Harrop inlet manifold, not sure what the Ford boys use.
Brake package is specced too these days, can't recall who supplies it. Alcon ?





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