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I know a 12 bolt from a full size Chevy won't work in my 65 Catalina because of the mounting differences but an A body 12 bolt has the perches cast into the center section. How much narrower is a 68 and up A body 12 than my 65 Catalina rear? If I used later Pontiac lower control arms with the bushin...

Can you explain the fundamental differences between a 12 bolt 1965 Pontiac ring and pinion and a Chevy 12 bolt ring and pinion? Can Chevy gears be machined to work in a Pontiac 12 bolt ring gear /10 bolt cover rear?

I have a question about available gear sets that would fit my 1965 Pontiac 2+2. I currently have 3:42 posi and wanted to step that at to maybe 3:90. Does anyone know if there are any gears available for my rear end?

Thanks
Tony