I finally got around to building a decent differential. This will replace the 3.00 open diff in my street car, but will likely end up in the T/A race car for the race. If I decide this will be too much for the 4-speed in the race car, then I will build a 3.55 differential for it. I used a new, 4-pin, billet trac-lok unit with a forged hat and 3.80:1 gears. Should play quite nicely with the T-5 5-speed in my '67 street car.