Speedway 350-300 User manual

1
350-300
INSTRUCTIONS
© 2019, Speedway Motors, Inc.
G-Comp Rear Suspension
62-67 Nova
350003.1
350003.2
350003.3
350003.4
350003.5
350004
350023
350024
G-Comp Chassis Brace
G-Comp Front Supports
G-Comp Upper Rear Crossmember
G-Comp Panhard Bar
Hardware Kit
G-Comp Rear Truck Arms
Panhard Bar Hardware, Nova
G-Comp Rear Panhard Bar Brackets
Kit Contents
TRUCK ARM
CHASSIS BRACE
REAR CROSSMEMBER
COIL-OVER SHOCK
(NOT INCLUDED)
PANHARD BAR
U-BOLT
CAM BOLT
PANHARD
BAR BRACKET
REAR END HOUSING
(NOT INCLUDED)
SADDLE
BRACKET
FRONT SUPPORT

2
350-300
INSTRUCTIONS
© 2019, Speedway Motors, Inc.
G-Comp Rear Suspension
62-67 Nova
1. Remove Rear Suspension: Raise the car and support it with jack stands or a lift. Remove the exhaust,
drive shaft, rear end, and all rear suspension components including the rubber bump stops. Disconnect
fuel lines and remove fuel tank. Remove fuel lines, brake lines, and E-brake cables from bottom of car.
These can be re-routed through the holes in the chassis brace after installation.
2. Prep for Welding: Raise the chassis brace into its approximate position and mark all areas that will be
welded. These areas should be ground down to bare metal to provide the proper conditions for welding.
(Any carpet or padding installed on back side of weld areas should be removed at this time.) To position
the chassis brace, the rear flanges of the chassis brace should be clamped tight against the leaf spring
boxes while the chassis brace is pushed up against the bottom of the car and centered left to right.
(4X) 5/16"-18 X 3/4"
BOLTS
CLAMP TO LEAF
SPRING BOX
CLAMP TO LEAF
SPRING BOX
FIT BETWEEN ROCKERS
FIT BETWEEN FRAME RAILS
FRONT OF CAR
ALIGN WITH OEM
SHOCK BOLT HOLES
SLIP OVER
FACTORY FLOOR SUPPORTS
FRONT SUPPORT TUBES SHOULD FIT TIGHT
AGAINST CROSSMEMBER FOR WELDING
3. Repeat step two with the rear cross member and front supports. Depending on the car, minor
trimming/fitting may be required. Bolt the upper rear crossmember to the car using the four supplied
5/16”-18 x 3/4” bolts. These bolts will go into the factory shock bolt holes. This will locate the
crossmember in the proper position.
4. Tack-Weld Crossmembers: Once all areas that will be welded are prepped and cleaned, then the cross
member, chassis brace, and front supports can be tack welded into place. (Some grinding and trimming
may be necessary to provide proper fit up.) Note: Do not fully weld the crossmembers at this time! Only
weld enough to securely hold the parts in place during mock up. Hint: Weld in places that can be easily
accessed with a grinder in case it becomes necessary to move or adjust the parts.

3
350-300
INSTRUCTIONS
© 2019, Speedway Motors, Inc.
G-Comp Rear Suspension
62-67 Nova
5. Prep Rear End: If re-using a rear
end, tear down the rear end to just a
bare housing. Remove any spring perches
or brackets. For the saddles and panhard bar
bracket to be positioned properly, it is critical
that they fit tightly against the bare axle tubes. Any
extra material on the tubes will need to be ground away
to provide a proper fit. Prep for welding by removing all paint,
oil, and grease where new brackets will be installed.
6. Assemble Truck Arms and Rear End Housing: Install
truck arms onto the front crossmember using the
supplied 3/4"-16 X 5-1/2” cam bolts and spacers.
NOTE: Install the cam bolts in the center of adjustment
as shown. The flat side of the bolt should be facing
upwards. Install rear end housing using the
supplied U-bolts and nuts as shown above.
Do not fully tighten U-bolts at this time.
7. Adjust Rear End: Raise the rear end to the desired ride height, relative to the car. (Suggested ride
height is about 12 ½” center to center for the shock bolt
holes). Support the rear end at this height and center it
in the car. The center to center distance on the top side
between the two truck arms should be 39” as shown.
The distance from the outer flange of the rear end
housing to the truck arm should be the exact same on
both sides. Once the rear end is centered, and at ride height,
spin the rear end housing to achieve the desired pinion angle.
Now, double check that the rear end is in the proper location and
tighten down the U-bolt nuts.
39”

4
350-300
INSTRUCTIONS
© 2019, Speedway Motors, Inc.
G-Comp Rear Suspension
62-67 Nova
8. Tack-Weld Saddle Brackets: Once you are sure the rear end is located properly, tack-weld the saddle
brackets to the rear end housing. It is recommended to double check all measurements after tack
welding.
5/8"-18 X 3 1/2"
BOLT AND NUT
5/8"-18 X 6"
BOLT AND NUT
9. Panhard bar: Secure the panhard
bar to the rear crossmember using the
supplied 5/8”-18 x 6” bolt and lock nut. Adjust the
panhard bar so that there is about ½” of thread showing
and tighten the jam nut. This will allow for a small amount
of adjustment in both directions. Now, raise the panhard
bar bracket into place on the rear end and bolt the panhard
bar to it using the 5/8”-18 x 3-1/2” bolt and lock nut. Rotate,
or “clock” the bracket on the rear end so that the bolt is
horizontal. Double check that the bracket is in the proper
position and tack weld the bracket to the rear end housing.
As shown, the panhard bar bracket should be about 17 ½” from
the center of the housing. The center of the housing can be found by
measuring the flange to flange distance and dividing by two.
DO NOT assume that the drain plug or third member are centered,
this is often not the case. You must measure to find the center!
NOTE: There are 3 possible locations for each end of the panhard bar,
use the mounting holes that make the panhard bar level with the ground
at ride height. This will vary depending on ride height.
17.5”
CENTERLINE
PANHARD BAR BRACKET
WILL BE VERY CLOSE TO
THE SADDLE BRACKET
BOTTOM VIEW

5
350-300
INSTRUCTIONS
© 2019, Speedway Motors, Inc.
G-Comp Rear Suspension
62-67 Nova
10. Check Alignment and Clearances: It is recommended at this point to cycle the suspension though
its travel and check for any clearance issues. This is also a good time to double check that the rear end
is aligned properly with the car and the pinion angle is correct. (use the cam bolts on the truck arms to
adjust the alignment)
11. Finish Weld: Remove the rear end, panhard bar, and truck arms from the car. Fully weld the cross
member, chassis brace, and front supports to the car. Weld the saddle brackets and panhard bar bracket
to the rear end. NOTE: It is a very good idea to only weld a small bead at a time, then move to a new area
and allow the first area to cool completely before welding further in that area. This will greatly reduce the
risk of warping, especially on the rear end housing.
12. Re-Assemble: Once all of the welding is complete, everything can now be re-assembled.
Secure the truck arms to the chassis brace using the cam bolts and cam spacers as shown in step 6.
Now is a good time to fully assemble the rear end by installing gears, axles and brakes. (This can also
be done after installing the housing into the car)
Raise the complete rear end into position. Attach the rear end to the truck arms using the supplied
U-bolts, washers and nuts.
Install the panhard bar using the 5/8”-18 x 6” bolt and lock nut on the crossmember end and the 5/8”-18
x 3 ½” bolt and lock nut on the housing end.
Install your coil over shocks using the supplied 1/2”-20 bolts. The 2-3/4” bolts and 3/16” wide spacers are
for the bottom while the longer 3” bolts and 5/16” spacers are for the top. Note: This kit is designed to use
shocks with a compressed length of 10” and an extended length of 14”. Shock ends should be ½” bearings
with a mounting width of 1”. For recommended part numbers please visit our website or contact one of our
tech experts.
Re-install the drive shaft, fuel tank, fuel lines, brake lines, and E-brake cable etc…
Bleed the brakes.
Fill the rear end with fluid.
Install wheels and tires.

6
350-300
INSTRUCTIONS
© 2019, Speedway Motors, Inc.
G-Comp Rear Suspension
62-67 Nova
13. Alignment:
Lower the car onto the ground and check for desired ride height. Adjust ride height if necessary by
raising the car and spinning the adjusting collar on the coil-over. Repeat procedure until desired ride
height is obtained.
Once the ride height has been set, lower the car onto the ground and make sure the rear end is
centered in the car body. Adjust the panhard bar if necessary. Lengthening the panhard bar will
move the rear end toward the passenger side, while shortening it will move the rear end toward
the driver side.
Now that the ride height is set and the rear end is centered perfectly in the car, the rear end can be
aligned by adjusting the cam bolts on the front of the truck arms. NOTE: This is difficult to do accurately
and a professional alignment is recommended. This method will get you close enough to drive the car
to an alignment shop.

SpeedwayMotors.com/Info/FAQ
WARRANTY DISCLAIMER Purchasers understand and recognize that racing
parts, specialized street rod equipment, and all other parts and services sold
by Speedway Motors, Inc. are exposed to many and varied conditions due
to the manner in which they are installed and used. Except for certain limited
warranties, if any, set forth in Speedway Motors, Inc.’s current catalog with
respect to the products and/or parts thereof identified on your invoice, each
product,andeachpartthereof,issold“asis”,and“withallfaults”andSpeedway
Motors, Inc. makes no warranties either expressed or implied, written or
oral, with regard such products and services including, without limitation,
any warranty of merchantability or fitness for a particular purpose. Without
limiting the foregoing, there is no warranty expressed or implied as to whether
the goods sold hereby will protect purchasers or ultimate end-users of such
products and parts from injury or death. In no event shall Speedway Motors,
Inc. be liable for any special, incidental or consequential damages, or any other
damages whatsoever arising out of or connected with the use or misuse of the
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person, entity or agent of Speedway Motors, Inc. has any authority to make
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or representations allegedly made on behalf of Speedway Motors, Inc. by any
such person, entity or agent are void. Purchasers are relying solely on their own
skill and judgment to select, purchase and use suitable products and assume
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of utility jugs, funnels and barrel pumps for dispensing fuel. Please check your
own state for more information, regulations or further direction in your use of
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on Speedway Motors websites. Some parts in this catalog are not legal for sale
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claims process, please retain original box, packing material and damaged
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SHORTAGES Please check the contents of your delivery to ensure that all
parts ordered are received. Refer to your invoice to cross check all items
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for instructions regarding shortage claim within 5 days of receipt. Speedway
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REFUSALS All refused packages will be billed the freight to and from the
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WARRANTY CLAIMS If the item is used or installed and a warranty claim
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RETURNS We want you to be satisfied with your purchase. If you are not
satisfied, you may return your new, unused item within 60 days for refund or
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All exchanged or returned merchandise must be in original factory condition
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returned item requires repackaging, your refund / exchange will be subject
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BRAKE INSTALLATION ALERT The selection and installation of brake
components should only be done by personnel experienced in the proper
installation and operation of braking systems. The installer must use his/
her own discretion to determine the suitability of all brake components
and brake kits for every particular application. Speedway Motors, Inc.
makes no warranties either expressed or implied including any warranty of
merchantability or fitness for a particular purpose, other than those contained
in its current catalog or website with respect to the goods identified on the
face of the invoice. There is no warranty expressed or implied as to whether
the goods sold hereby will protect the purchaser or ultimate user of such
goods from injury of death.
EXHAUST INSTALLATION ALERTExhaust systems and other component
surface finishes are not permanent. Coatings, paint and other factory supplied
cosmetic treatments are only intended to protect from surface corrosion in
an unused state. No returns are allowed after the parts have been installed.
Header flanges must be clean and clear of paint and surface contaminants
prior to mating to exhaust gaskets. Exhaust fasteners must be re-torqued
after the initial heat cycle and regularly thereafter to ensure a proper gasket
seal is maintained. Should you decide to install this exhaust product at your
home, be warned that pleasure car or light duty truck/van “bumper” jacks
are intended for emergency use only. The use of frame contact jack stands
in conjunction with a floor jack as a main support is highly recommended to
minimize accidental dropping of a vehicle while the installation proceeds. We
recommend the use of a shop hoist if possible. Please use caution! Speedway
Motors, Inc. makes no warranties either expressed or implied including any
warranty of merchantability or fitness for a particular purpose, other than
those contain in its current catalog or website with respect to the goods
identified on the face of the invoice. There is no warranty expressed or implied
as to whether the goods sold hereby will protect the purchaser or ultimate user
of such goods from injury or death.
CHECK LOCAL LAW Some parts are not legal for sale or use in California on
any pollution controlled motor vehicles. These items are legal in California for
racing vehicles only which may never be used upon a highway. Check local
law.
Speedway Motors, Inc.
P.O. Box 81906 • Lincoln, NE 68501
800.979.0122 • SpeedwayMotors.com
Find the above info on our website:
© 2019, Speedway Motors, Inc.
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