The actual link between SJ’s and safe-t-track was that all early production 1969 428 GP’s (including all SJ’s therefore) had mandatory STT. There is an early January 69 memo announcing that STT was no longer mandatory with a 428. I suspect that the issue was that they were worried about the strength of the 2 pinion differential with 428’s and the only 4 pinion 10 bolt differential pontiac had in 69 was the STT version. Did they allow non STT in January because they released a 4 pinion open differential or did testing satisfy them that the 2 pinion would be sufficient after all on open diff applications?
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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