A solid axle inherently can’t achieve as much bump travel as an A-arm system. Remember that with a solid axle, the wheel centerline is in the same plane as the axle housing. The axle housing can only travel so far upward before it hits the frame rails or oil pan.
On the other hand, an A-arm system doesn’t have this restriction, and the wheels can travel much further upward. Of course, you do have to be careful that your frame doesn’t hit the ground at full bump!
Speedy Solid Axles
A speedy solid axle rig doesn’t have to be completely custom built, but it still has to use the right combination of aftermarket parts. Long-arm suspension kits, such as Off-Road Evolution’s Double Throw-Down system seen on this ATX Wheels JK Wrangler, offer greater strength and increased wheel travel thanks to re-configured suspension mounts, and longer, stronger suspension links.
If there’s no long-travel suspension kit for your solid axle rig, builder parts are readily available to help you create your own. Long-travel leaf springs are also available from companies like Deaver Spring.
No go-fast party, solid axle or A-arm, is truly complete without a set of bypass shocks. Bypass shocks offer a level of control that other shocks can’t touch. The added control means added safety and confidence. This translates into higher velocity and more fun.
Need rugged simplicity? A solid front axle wins this one. Want more strength for less coin? A solid front axle wins this, too. Want ultimate go-fast off-road performance? It’s time for a modified IFS.