Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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'70-72 factory 455 Pontiac A bodys and GP's along with '70 400 4spd GP's all were equipped with McKinnon built 12 bolt differentials.
The Pontiac usage McKinnon 12 bolt included:
- specific axles, c clip retention, but not the std duty chebby 12bolt c clip axle
-3R pinion flange, not the Chebby's smaller Spicer 1310
-use the same backing plates and drums as Pontiac A body's, not the smoothie style drums and style of backing plates with the spotwelded on edge used in millions of Chevelles, Camaro's, Elco's, Monte's Nova's, '70-74 Firebirds and '71-72 Venturas
'70-72 factory 455 Pontiac A body body styles had their own specific frame, so did '70-72 Buick GS 455's.