When you pick up a torque converter, it seems heavy and really solid. So it's easy to forget that they are a pressure vessel that expands, contracts and changes shape as the engine revs, load, and temperature change!
The TD5 converter is actually slightly smaller (13mm) than the 505 torque converter than I was originally using. With all else being equal, this means that it will probably have a slightly higher stall speed, but I don't think it will be particularly noticeable. What I do like about it is that it has a hardened spline, heavy duty lockup clutch linings and heavy duty torrington bearing installed, so it should be more durable. Also, should it fail, I expect it will be easier to find a replacement than a good 505 unit these days. The TD5 unit I have now came from a 2003 model Discovery II.
The TD5 converter is actually slightly smaller (13mm) than the 505 torque converter than I was originally using. With all else being equal, this means that it will probably have a slightly higher stall speed, but I don't think it will be particularly noticeable. What I do like about it is that it has a hardened spline, heavy duty lockup clutch linings and heavy duty torrington bearing installed, so it should be more durable. Also, should it fail, I expect it will be easier to find a replacement than a good 505 unit these days. The TD5 unit I have now came from a 2003 model Discovery II.