There is a particular kind of looseness that old trucks develop, and drivers describe it in the same words. The steering wanders. The truck needs constant small corrections on the highway. Something clunks, faintly, when the front wheels cross a seam in the road.
This is the front end telling you it has more play than it should, and it is one of the few mechanical problems that is easy to find with nothing more than a floor jack, two jack stands and a pry bar. It takes about ten minutes, and it is worth doing every spring.
Before You Start
Park on level, solid ground, chock the rear wheels and lift the front of the truck by the frame. Support it on jack stands. Never put your hands or your head under a truck held only by a jack. If the truck is not secure, nothing that follows is worth the risk.
Wheel Bearings
Grab the tire at the top and bottom and rock it in and out. A little movement can be normal on an adjustable tapered bearing, but a clear clunk means the bearing is loose or worn. Spin the wheel and listen. A grinding or rumbling sound deserves a closer look, and a repack with fresh grease is a standard part of owning these trucks.
Ball Joints
With the wheel in the air, pry gently between the lower control arm and the frame or the tire and the ground, and watch the joint itself for movement. On these trucks the coil spring sits on the lower control arm, which means the position of the jack changes how the joint is loaded and what the reading tells you. Follow the service manual's procedure for where to place the jack, and replace joints that show play beyond its limits.
Tie Rod Ends and the Steering Linkage
Grip the tire at the sides, at three and nine o'clock, and push one hand in while pulling with the other. Movement here points to a worn tie rod end or loose linkage, which is separate from the ball joints. Have a helper turn the steering wheel slightly while you watch each joint. A joint that moves before the wheel does is worn.
Bushings and Shocks
Control arm bushings are rubber, and rubber ages whether or not the truck is used. Look for cracks, tears and bushings that have squeezed out of their sleeves. A shock with oil running down its body has lost its seal and should be replaced. If the truck has been lowered, check that the geometry still works. Our guide to lowering a C10 properly goes into what has to change when ride height does.
Worn parts rarely fail alone. A loose ball joint wears the tire, and a worn tire hides the next problem.
Reading the Tires
Tires keep a record of everything above them. Wear on the inside or outside edge points to alignment trouble, and scalloped or cupped patches often mean worn shocks or a loose joint. Look at the tires before you start, and again after you finish. If you replace anything in the front end, plan on an alignment.
What to Do With the Results
If everything is tight, grease the fittings, torque the wheels and drive the truck. If something is loose, resist the urge to replace only that part. Control arms, bushings and ball joints wear on roughly the same schedule, and replacing them together is usually less work than coming back to them one at a time. Heavy-duty tubular control arms are a popular way to do it, and they remove the question of worn bushings for years.
A tight front end is not exciting. It is simply the difference between a truck that goes where you point it and one that merely heads in that general direction.
