Can you specifically explain why a three link is not good for drag racing? We are all entitled to our opinions, but I could not disagree more with this statement.
A four link system using rod ends or delalum type bushings will bind terribly in roll, physics just won't allow the thing to work around turns. The only reason that drag style cars roll around turns at all with a four link is that something, or many things, are flexing. Could be the frame, could be the links, the rear end brackets, you name it, but it is physically impossible to roll a four link with solid type end links without mechanical bind. Sorry. Poly will be better in that it can compress, and will allow more roll until it can't compress any more, but poly is also stiff, so it'll resist roll too. Rubber is the best, and actually, only solution for the street for a four link.
A torque arm setup is not a three link, it's a torque arm. They can be made to work pretty good, but there are a few really critical tricks for making them work well, and the geometry is usually tough to find a really good overall compromise. If you go too short with the t/a, you have to worry about rear brake hop, too long and you really need to be concerned with the strength of the t/a because it carries basically all of the axle torque. Nothing is free, unfortunately.
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