Quote Originally Posted by Dr Terry View Post
Quite often when introducing new parts for ADR compliance, it can be done way ahead depending on existing stocks of the necessary parts at the time. There are many cases in Holden production where ADR items were introduced into production ahead of the required legal date. They could have exhausted the stocks of 5mm steering wheels in say Sept 1977 & began fitting 3mm wheels 5 months ahead of time, yet these cars would have still remained legal.

Also AFAIK the ADR25a intro date was Feb 78 (not Jan), at that time AHZ became BHX & CLX became DLX.

Dr Terry
They did introduce the new steering wheel early.


ADR-10b ... Steering columns
Effective date 1st Jan 1973. Revised July 1977 - effective date 1st July 1988


Holden made the change effective from 1st Jan 1978 at the same time as ADR-25a. So 6mths early.


As I have stated, I have generally found parts manuals to be pretty accurate with change dates when the date of change is actually listed in the manual. This is certainly the case with Ford.

I don't claim to have it nutted out but until someone comes up with proof otherwise I will go with the manual as to a change date of Jan 78. You have to start somewhere.