Mostly the gearing. The best ratio for the Mazda axle is 3.31:1, if you can find it. Also I get a good limited slip, better brakes, a more common lug pattern, and with it comes a better rear suspension geometry, because there's no way to transfer the offset high Watt's link pivot to this axle, so I can move it lower and centered behind the axle, plus make it chassis-mounted. Then that frees space to replace the triangulated 4-link with a 3-link that won't bind up and cause snap oversteer. So I'm re-engineering the car on a total maximum budget of $ 5000. The first major changes will be getting the front end done. Then I can get the engine and trans in before moving to the rear end. All that before finishing the interior.
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I put a 0.045" cutting disc on my angle grinder, and started correcting the FC crossmember. In no particular order, here are the pics so far. BTW, if you copy this, you need to establish a baseline, do plenty of careful measuring and figuring, and keep track of your reference points. I'll give my exact measurements once my results are acceptable. If you do copy me, it is at your own risk, et cetera.
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