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Currently, the car is a stock suspension 82, with stock gearing. The thought was to upgrade to an iron diff, since they came with 3.55:1 ratio.
So for parts, we've got the diff and the axles and flanges from a 79.
We'll need a cross member, struts and strut mounts.
I'll need to well in a bracket to mount some of this stuff. and maybe massage the iron diff to bolt to the batwing?
Or, just get the stock diff built with better parts, and a new gear ratio...??
Sounds like You have most all the Parts and the Ratio You want so that changes everything. Your never going to go into a rear end and rebuild and or change the Gears for cheap. I'd have a good look at the Iron diff you have to make sure its ready to go and then I'd use the search feature at the top of the page to find more people and Pics of this swap. Its pretty comon on this site.