|Project Old School: In Control
Adding a Front Sway Bar to an Airbagged Ride
By Jeremy Cook
It's no secret that sway bars are extremely beneficial to the handling
capabilities of old trucks. It's also no secret that most of the '63-72
GM products did not come with them as standard equipment. Simply put, there
is no easier or more cost effective way to improve upon the handling of
your classic truck.
Also referred to as a stabilizer bar or anti-roll bar, a sway bar connects
the left and right sides of a suspension together. During cornering, the
body tends to lean or fall over. This is what is commonly referred to as
body roll. Connected to each control arm, the pressure applied from cornering
twists the sway bar against the lean, causing a reaction that produces a
lifting force on the outside of the body and a downward force on the inside
of the body. This evens out the pressure generated by a corner across both
tires, which greatly improves handling by making more traction available
to the driver.
| The Classic Performance Products' sway bar is stout to say the least.
Thicker than any of the stock units produced for these trucks, it has an
overall diameter of 1.25 inches, is constructed from high-carbon steel,
and comes gold/irridite plated. Using the stock holes in the control arm,
end links with urethane bushings are installed to position the sway bar.
Frame mounting brackets are also provided in the kit, and if they're there,
use the factory holes in the frame. From start to finish, it took us about
an hour to install the CPP sway bar kit. The install is a bit more involved
on Old School due to the airbagged suspension than it would be on a standard
coil-sprung truck. The reason is that you have to make sure that the sway
bar does not interfere with any of the suspension components throughout
the entire suspension cycle--which on this truck is over 8 inches. So follow
along and contact CPP about their front and rear sway bars for almost any
classic truck out there.|
|CPP's front sway bar kit comes complete with the frame mounts and bushings
along with the complete end-link kit and hardware. Pictured are both the
short and tall frame mounts. Since we're dealing with an airbagged truck,
we weren't sure which combination of frame mounts and end-link spacers would
provide the most clearance from the other components.
|| The truck was lifted up to ride height, and then we jacked it up and
placed jack stands under the lower control arms. |
| CPP's frame brackets are made to fit the contour
of the frame perfectly. Logical guys that we are, we started by using the
frame brackets intended for lowered trucks.
|| The first step is to install the sway bar onto
the control arms using the end-link hardware. This size spacer is the norm
for moderately lowered trucks.
|| Next, the center bushings (with a bit of the
supplied grease) were spread over the bar. Then the clamps were bolted to
the frame mounts with the supplied hardware.|
| Now the mounts were held up against the frame
so it could be marked and drilled.
|| Before we even had all four bolts snugged down,
it became obvious that with this configuration, the sway bar would hit the
Pitman arm of the manual steering box before the truck was fully aired down.
|| By using the taller frame mounts, hopefully the
sway bar would drop down enough to clear the steering. They were bolted
up using the same holes in the frame.|
| The sway bar was bolted up and rechecked. There
was now plenty of room between it and the steering.
|| All eight bolts at this end were then fully tightened
|| Here it is installed. We put the truck back on
the ground and cycled the suspension from fully raised to fully lowered.
There was no interference, but we did spot something that needed a little
| The upper 'bag mount on the Air Lift kit is made
to cover the spring hat and hangs out about 1/4-inch on either side. When
dropping the truck down, the end of the sway bar just missed this extra
bit of metal. We decided to trim it back a little with the die grinder to
give it a bit more clearance.
|| Just to be on the safe side, we pulled the spacer
out of the end link. Now with the airbag fully compressed, the sway bar
does not travel past the spring hat. Of course, changing the configuration
meant that we had to cycle the suspension again, but the change actually
yielded more clearance than before.
|| There you have it. Even with the changes we were
done in less than an hour. We didn't run Old School through the slalom course
or anything, but I will tell you that I can now take the freeway onramp
near the office at full speed without the tires squealing. Now that's progress.|
|Classic Performance Products 378 E Orangethorpe
Ave., Placentia CA 92870 Tech Line 714-522-2000|
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