[Sirrotica]

You could put a T 350 convertor in and gain a few hundred RPM stall with it. I used a 350 convertor in my 73 T/A with a 455, and a 3.08 gear, it worked well on the street, and autocross. The stock T 400 is 13 inch, and the T350 is 12 inches, giving you a few hundred more stall, but isn't loose and mushy like a higher stall convertor can be, the bonus is it can be really inexpensive if you, or a friend have a stock 350 convertor lying around. Even a re-man should be under $150.

A stock T 400 13 inch stalls at 1800-2000 RPM, a stock 12 inch T 350 should bring you up to 2100-2300 RPM. Not a huge change, but the butt dyno should see it.

The best thing is it's a cheap swap, if you don't like it, you can swap for something aftermarket when you swap your rear gear. Your fuel mileage should be close to the same, if you care about fuel mileage.

If you're looking for a huge difference in stall, this may not be the convertor you want, but for a small change it works.