Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The standard rearend for a base 400 350 horse 3 spd car, the base '69 GTO, was a gray iron housing Pontiac 8.2 10 bolt with 3.55 gears. The axles will be the std duty Pontiac 8.2 axles with RW507 sealed axle bearings. I've yet to find an original example of a late '69 model Pontiac A-body with tapered bearing axles & ive been pulling original axles, & differential parts for near 3 decades. Late '69 Firebird production, yes, they had tapered axle bearing axles.
Safe-T-Track was optional. With 3.55's, the Safe-T-Track (posi) carrier would have been a 4 pinion unit, & the center hsg will be nodular iron with a Julian date code, not the common gray iron center hsg. The gray iron center hsgs did not provide enough pinion support with smaller (less tooth) pinion gear ring & pinion sets. Pontiac went to the nodular iron center hsg in its lower ratio Safe-t-track & HD Safe -T-Track PONTIAC 8.2 rears, that began with '67 models. That tactic worked well in several applications, but was deemed inadequate as engine torque levels reached near 500 ft lbs.