I just finished this process in my 75 280z 2+2 with v8 conversation. The least expensive and easiest way I found was to purchase 1984 to 89 turbo cv axles from rockauto, take them apart and have a machine shop shorten them on the differential side approximately .625, cut a new snap ring Grove then put them back together. On the hub side I bought adaptors and welded to the existing hub flange. You can buy replacement flanges that adapt to the 300zxt axles. Shortening the axles stops binding if you have lowered your car. Good luck!
