THE FOUR-LINK SUSPENSION DESIGN HAS LONG BEEN THE GO-TO FOR DIFF SET UPS; HELL, IT’S BEEN AROUND SO LONG, WE’RE PRETTY SURE JESUS HAD THE SAME SET UP ON HIS WOODEN CART. NICK MITCHELL FROM MITCHELL RACE EXTREME GIVE US THE LOW DOWN ON DESIGNING AND TUNIN
For those of you with independent rear ends, look away now, as this piece is not for you. But the four-link is probably the most common form of rear link, not only in modified road and race cars, but also on some early factory live rear axles; think RX-2s and KE Corollas. If you’re choosing a new set up for your rear, there are better ones out there, but it always comes down to the application of the vehicle — circuit, drift, drag, or road — power output, and, of course, budget! A lot of the time, it’s not just about chucking in some new brackets and arms; the diff housing set-up will need to be looked at, especially if more power has found its way into the front of the vehicle. Packaging can also play a role in the design, and will depend not only on whether a full four-link will fit in the chassis you are working with, but, if it’s a road car, whether you still want to retain the rear seat. The location of chassis rails is important, and most applications will try to keep the arms just inside or outside of the rails — this gives a good anchor point for the forward mounting plates. Wheel size is another thing to consider when designing the set-up.