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a 3 link drag racing,buts the load force on top housing,and can push the center down lifting the tires,basiclly making a u shape out of the rear end and un load the tires.
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I truly mean this in a respectful manner, but that is just not true. In forward acceleration, the lower links of a four or three link are in almost pure compression, and the upper(s), in almost pure tension, so if anything, the forces localized to the axle housing will try to twist it, not bend it as you suggested. Further, the lion's share of the forces will be on the lower control arms, in fact the way our setup is designed, the upper link itself sees less force than each of the lowers. I can see your point about the force application on the housing, but if you are twisting the axle housing, you have bigger issues that going around turns!
One benefit for REALLY fast drag cars using a four link is the ability to pre-load the chassis for good dragstrip lanching to handle the roational torque from the drivetrain. Effectively, what folks do is deliberately introduce bind/compression into the system, which is a big time no-no for a car driven around turns. It sounds to me like Jason IS interested in turning, even if it is not the primary goal of the setup.
Mark