Dana 60 Kingpin Spring and Bushing Kit
Dana 60 (common to all GM axles and early Ford and Dodge axles)
uses a tapered plastic bushing and preload spring to locate the
top of the steering knuckle. As everything wears and we
put big tires with lousy balance on the truck, it's common to
develop what's known as "death wobble". You typically know
it if you have it, at roughly 25 mph the front tires will start
a violent oscillation that typically requires you to come to a
complete stop before it will go away.
One of the contributing factors in death wobble is wear on the
tapered kingpin bushing and fatigue on the preload spring.
A less common problem is actual breakage of the bushing, this
usually only happens with a really big hit on the front end.
The broken bushing below resulted from a 5500# truck coming down
on the left front tire from a considerable height. The
wheel also bit the bullet on this one.
So, whether your damage is due to use (abuse) or simply long
term wear, we have the spring and bushing kit to get the proper
alignment on the upper kingpin.
2 springs, 2 bushings and 2 new spring cups.
This is a photo of the kit contents:
photos of the busted nylon bushing, mangled spring cup and a
comparison shot of the new spring vs. an old spring. Notice the
old spring is about .2" shorter? That's no good.
bushings and springs look like theses, it's time for
that a lot of people are trying is shimming the kingpin spring
tighter to get more preload on the bushing. Measurements
indicate that adding 1/8" more preload may help out but adding
more than that may get you into a coil bind situation which is
very hard on parts. We've used an additional spring cup on the
top of the spring to load it a little tighter and that's worked
fine also. The spring cup thickness is about .060".
interested in rebuilding your entire knuckle bearing and bushing
assembly, we have a rebuild kit for that.
click here for more info.
kingpin bushings and springs is a relatively easy project. All
you have to do is remove the tire, unbolt your steering arm or
spring cap and replace the parts just as they come out. Have
plenty of grease on hand, they take a LOT. Here is a photo of a
spring swap in our shop. The jack is under the bottom of the
knuckle keeping it pushed up into position so the new parts can
be installed easily.
category you would like more information on.