|Having had excellent results and customer feedback
from our conventional
style tubular control arms and Bilstein shock absorbers, we wanted to take
things to the next level and offer even more control to our customers.
Using the same race winning geometry as on our conventional tubular control arms
we specified a couple of different Bilstein coil over shocks and designed our
coil over system. Used by OEM’s such as Porsche and Audi, Bilstein also has a
long street use and racing history. This is the perfect shock for such an
advanced coil over system for your Mustang and classic Ford. A quick
benefits list of our coil over system compared to a conventional spring/shock arrangement
- Easy ride height adjustment. Our shocks feature a threaded sleeve,
simply rotate the adjuster with the supplied wrench to raise, lower or cross
weight the car. No cutting springs, no guessing.
- 50% better motion ratio allows use of lighter springs and more shock
motion for improved control. An improved motion ratio also has the side
benefit that the forces directed through the spring and into the chassis will
be lower. Less tower flex and chance of cracking.
- Although we have chosen what we feel and have calculated to be a great
combo, coil over springs can be had in 25-50lb increments which is a vast
improvement over the conventional spring offerings.
- We've designed our system to feature super easy spring/shock removal. The
entire spring/shock assembly is held on by 1 bolt on the top and 1 bolt on the
bottom. No spring compressors, no swearing.
- Heim bearing shock ends further reduce bind found in stock setup. This transmits road forces directly to
the spring & shock allowing it to do what its designed to do and get the tire
back on the road quicker for more control and better handling. This can
be compared to the benefits found in using roller spring perches on a conventional system. Other
systems on the market that use rubber or polyurethane shock bushings will bind
during regular suspension travel and when the strut rod is used to move the
lower control arm to set caster.
Not satisfied with just picking an off the shelf shock that fits the space,
we worked for a full year computing motion ratios, wheel rates, sprung and
un-sprung weights, critical damping and a massive list of other variables to
design our own proprietary Street, Sport and Race shock & spring combinations
specific to the 65-73 Mustang and other vintage Fords. We do NOT use a standard
'off the shelf shock' that simply fits in the space and 'sort of feels right'.
Each shock and spring package is designed based on the vehicles weight and
Alongside the year of math, shock curves and shock dyno time we drove many, many
street miles and 100's of laps on our favorite racetracks for a real world 'seat
of the pants' validation of each combination from us and a selection of test
View many more installed pictures in our
Customers Cars section on our Facebook page.
The 3 shock valving & spring combinations available for our coil over
We feel that this combination rides as close to a modern production car as you
are likely to get from your classic. That was our goal and we feel we've
met that. In fact even our shock tuning
engineer was blown away at how nice our 1966 Mustang coupe test car drove down a
bumpy, twisting Michigan road! Choose this system if you want a smooth yet
responsive ride from your classic that you can drive for hours and hours without
feeling beaten up. Due to the lighter spring rate used, this is also our
recommended setup for dual purpose street or drag car.
We worked really hard on this package to design it for all those dual purpose
street or open track cars out there. This package gives a smooth, crisp,
controlled ride on the street but can also handle bouncing off the curbs and
slick tires at the road course. Choose this system if you like carving
around bends, on/off ramps and/or open tracking with NO need to switch shocks or
click gimmicky knobs.
For our race setup, the shock gets switched for one with a Schrader valve to
adjust/set nitrogen pressure. With a shock inflator gauge like #LON50473 and a tank of
nitrogen from your local welding supply store, this enables the customer to change gas pressure beneath the dividing
piston. Choose this option for a dedicated track car. Our hired
'butt dyno' driver lapped 3 seconds quicker in his 1965 coupe when compared to
times using his highly modified conventional front suspension setup. The
stop watch doesn't lie. This valving can also be built into a Bilstein
shock without the Schrader valve should you not wish to have the option to tune
gas pressure but still want the race setup.
All of the shocks used in our coil over system will give many, many years of
service. When the time comes, the shocks are completely rebuildable/serviceable
by us or any worldwide Bilstein rebuilder. You can rest assured that your
investment in this system is one that you can easily maintain and enjoy for many
Shaft Mounted Bump Stops
Below you can see our optional shaft mounted bump stop conversion. This
NASCAR spec. progressive durometer bump stop installs on the shaft of our
Bilstein shock and replaces the stock bump stop. This enables you to
remove the outer spring tower cover and bump stop allowing a slightly lower ride
The stock bump stop is extremely hard and has a tendency to upset the
handling of the car. The progressive nature of this bump stop slows down
the impact when the suspension bottoms out, minimizing the unsettling nature of
Select this upgrade under 'Options' below.
Precision Ball Joints
Another exciting optional upgrade we offer to our coilover system is these high precision ball joints.
These precision ball joints offer the precision of a spherical bearing with the misalignment range of a ball joint.
Their rugged steel housings will withstand impacts that can destroy other ball joints.
Plus, even if you manage to damage the joint, they are fully rebuildable.
The alloy steel ball studs are process coated for low friction and long wear.
You will feel the difference in smooth travel and easy steering effort.
Select this upgrade under 'Options' below.
Click the image above to watch a brief YouTube video showing the reduced friction between the two ball joints.
Coilover System includes:
- Tubular .156 wall TIG welded upper control arms with replaceable
adjustable length chromoly heim bearing pivots, 4140
chromoly cross shafts and easily replaceable Moog screw-in ball joints.
Shipped with the front bearing 3 turns further out than the rear. This
adds approx. +3 degrees of positive caster to the spindle when installed
before having to shim the front bolt or shorten the strut rod. More or
less is easily possible by simply adjusting the bearings in or out. Arms and ball joints
are compatible installed in stock all the way down to 1-3/4" lower holes.
1" drop template included.
- Tubular .156 wall TIG welded lower control arms with replaceable
chromoly, kevlar/Teflon lined mono-ball inner pivots and easily
replaceable Moog screw-in ball
- A pair of our Adjustable strut rods.
- Your choice of Street, Sport or Race valved Bilstein shock absorbers
and matched Hypercoil coil-over springs tailored to your year vehicle. Spring
and shock assemblies comes pre-assembled complete with thrust bearings.
Helper springs with guides are also supplied should the vehicle and spring
rate require it.
- Lower CNC machined billet shock mounting brackets.
- Upper laser cut, TIG welded shock mounting brackets.
- Upper CNC machined billet stock spring seat adapter rings - Installs
over the stock spring seat negating its removal. No need to drill
out the spot welds and hack up your car.
- Laser cut engine bay cover plates - Covers the hole for a clean look
in the top of the shock tower that the stock shock used to go through.
- Hardware required to install the system.
- Spanner wrench to adjust ride height.
- Detailed instructions.
Download our product flier
Read about our stealth BOSS 302 installation
- STCO6566 fits 64-65 Comet, 64-65 Cyclone, 60-65 Falcon, 65-66
Mustang, 64-65 Ranchero,
- STCO6773 fits 66-77 Comet, 67-73 Cougar, 66-71 Cyclone, 66-71
Fairlane, 66-70 Falcon, 68-71 Montego, 67-73 Mustang, 66-71
Ranchero, 68-71 Torino. STCO6773 also fits XA XB XC and XD Australian Falcons
- Alignment required after installation.