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Contemporary, Corner-Carving Components for Classics
Part 1: Tubular Control Arms, Coilover Shocks, and Big Brakes Make for a Better-Performing C10
BY Ryan MansonPhotography BY Mike Chase
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hen the 1963 Chevy C10 was introduced, it was one of the first fullsized trucks to be offered with a modern, independent front suspension design. While Ford retained its love for the straight axle, albeit upgrading eventually to the twin I-beam design, Chevy opted with a frontend more reminiscent of their passenger car line of the era. The design was a success and one that GM eventually carried on into the ’80s and beyond. Yet while the basic design was a success, especially when it came to easily lowering these trucks, it wasn’t without its faults. The stamped control arms tended to flex under heavy cornering or aggressive driving and a rudimentary lowering job meant the original suspension geometry oftentimes changed, and not for the better. But factory improvements throughout the years meant the early trucks could be easily upgraded with such bolt-in items as disc brakes and power steering, making for a more modern classic truck.

While modern amenities no doubt helped keep these classics on the road, we eventually hit a tipping point where these trucks were being pushed to their breaking point, performance-wise. While the aftermarket industry concentrated on every upgrade imaginable for the muscle car market, our lowly trucks were left with 30-year-old components and technology.

Recently, it seems the aftermarket has seen the light and we’re entering a renaissance of sorts when it comes to upgrading our old trucks par with their contemporary passenger car brethren. Oversized tubular control arms, sway bars, coilover shocks, big brake packages, and even LS swap kits have made it easier than ever to bring that old truck into the 21st century.

Speedway Motors has been offering parts for racers and hot rodders alike for decades, with the classic truck market recently becoming one of their ever-growing outshoots. From fuel tanks to radiators, Speedway offers just about everything needed to upgrade or restore that vintage pickup. It was with this knowledge that led the crew at Cotati Speed Shop to Speedway Motors while searching for solutions to alter Pete and Leslie Richmond’s 1968 Chevy C10’s stance. Pete and the Cotati crew discussed their goal of having a truck that sat right (5-6 inches lower) and handled similar to the vehicles he and his wife are used to driving on a daily basis. They decided on a kit from QA1 and sold through Speedway that fit the bill perfectly and would even allow the crew at Cotati Speed Shop to fine-tune the camber and caster settings, resulting in a further-improved driving experience for the Richmonds.

Coupled with a set of their double-adjustable coilover shocks and stout sway bar, the guys were convinced the QA1 setup would be perfect to give the C10 the handling characteristics they were looking for with the ride height adjustability and superior performance QA1’s products are known for. What’s better? The entire QA1 kit is a 100 percent bolt-in affair. No welding necessary; just a variety of simple hand tools is all that’s required.

To complement the QA1 front suspension kit, the Cotati crew added a pair of Classic Performance Products (CPP) Dropped Modular Spindles to the build sheet, which will lower the truck an additional 2 inches (bringing the total drop to 5 inches) and will accept CPP’s Zero-Offset SOS Big Brake Kit with its large caliper and 13-inch rotors. A brand-new CPP 500-Series Power Steering Box will bolt in place of the stock manual unit, the final piece of the upgrade puzzle.

QA1 front control arm kit
1. Here’s the QA1 front control arm kit for 1963-1987 Chevy/GMC C10 trucks straight from Speedway Motors (PN 72152611D750). Tubular control arms and 750-pound double-adjustable coilover shocks are standard fare. The guys at Cotati Speed Shop opted to add a QA1 sway bar kit (PN 72152896) to further complement the components.
upper control arm mount
2. With the original suspension and steering components removed, there’s one more item that needs to be addressed before the installation commences: the upper control arm mount. Two rivets mate the upper control arm mount to the top of the crossmember and need to be removed using an air chisel or a grinder. Next, the four fasteners that mate the mount to the side of the framerail are removed and the upper control arm mount is set aside.
QA1 upper control arm bracket
3. Before the new QA1 upper control arm bracket can be installed, there are a few modifications that may be necessary, depending on your particular chassis, which includes modifying the 1 1/4-inch hole toward the front of the truck to line up with the upper control arm mounting studs on the QA1 bracket.
spring pocket opening on the crossmember
4. The spring pocket opening on the crossmember also needs to be enlarged to match the opening on the QA1 bracket. With the modifications complete and the bracket sitting nice and flat, a set of four 3/8×1 1/4-inch fasteners are loosely installed to hold the bracket to the crossmember and a set of four 7/16×1 1/4-inch fasteners are installed to attach the bracket to the framerail.
frame bolts are torqued
5. With all the fasteners loosely installed, the 3/8-inch frame bolts are torqued to 30 lb-ft, followed by the larger crossmember bolts torqued to 45 lb-ft.
upper control arm bracket
6. The upper control arm bracket is installed and ready to accept the QA1 upper control arms and coilover shock.
QA1’s lower control arms
7. QA1’s lower control arms use a larger 9/16-inch U-bolt, requiring the holes in the crossmember on the 1972 and earlier trucks to be enlarged to suit.
lower control arms are installed
8. Next, the lower control arms are installed against the cross shaft mounts on the frame, being sure to align the front dowel pin in the control arm cross shaft. The rear alignment dowel does not need to line up with the index in the cross shaft.
four U-bolt nuts
9. The G-Comp subframe was the perfect width to slip inside the Ford frame. It was then welded at each end, skip welded along the bottom of the tubes on the inside of the frame, and rosette welds were made through the factory holes in the ’rails.
two concave spacers are installed
10. With the lower control arms installed, our attention is turned once again to the upper control arm bracket, where the two concave spacers are installed on the control arm mounting studs …
flat side of the cross shaft faces the frame
11. … followed by the upper control arm. Note that the flat side of the cross shaft faces the frame.
shims are installed for an initial alignment guess
12. A few shims are installed for an initial alignment guess before the upper control arm nuts are snugged up. These fasteners will be torqued to 70 lb-ft once the final frontend alignment is complete.
bumpstop and bracket
13. A bumpstop and bracket is included in the QA1 kit, which attaches to the lower control arm using the provided 3/8×1-inch hardware torqued to 30 lb-ft.
double-adjustable QA1 coilover
14. With the control arms in place, the crew at Cotati Speed Shop installed a double-adjustable QA1 coilover through the crossmember pocket and attached it to the upper control arm bracket using 1/2×21/2-inch hardware. A pair of spacers are installed between the shock eyelet and the mounting bracket.
lower shock mount
15. The lower control arms have a recessed front strut to increase tire clearance. They come equipped with heavy-duty ball joints and Delrin bushings.
lower shock mount in place
16. With the lower shock mount in place, the lower control arm can be raised and the QA1 coilover shock attached to the lower shock mount using the provided 1/2×21/2-inch hardware.
installation of the spindle
17. The installation of the spindle is the final step in wrapping up the basic suspension component installation. The spindle is first attached to the upper ball joint, then the lower control arm is raised to connect the lower ball joint. The upper ball joint castle nut is then torqued to 50 lb-ft while the lower gets torqued to 90 lb-ft. Once torqued, each nut is further tightened until a cotter pin can be installed.
Classic Performance Products (CPP) Modular Dropped Spindle
18. While Pete wanted to get the 1968 down in the weeds, he also wanted to upgrade the front brakes on the C10, so it was decided to use a Classic Performance Products (CPP) Modular Dropped Spindle. Used in conjunction with the QA1 front suspension kit, this setup is good for a 5- to 6-inch drop, depending on the coilover adjustment.
improve the handling of the pickup
19. Dropping the C10 wasn’t Pete’s only goal when it came to upgrading the front suspension, he also wanted to improve the handling of the pickup as well. For that end, the Cotati crew will also be installing a QA1 tubular front sway bar. Designed to be installed using the stock mounting location, for trucks originally equipped with a factory sway bar the installation is a breeze, requiring a simple swap of the factory brackets with QA1’s dropped units. When it comes to a truck not equipped with a factory sway bar, two rivets that mate the crossmember with the framerails need to be removed and the holes used as the rear mounting position of the QA1 sway bar brackets.
sway bar is installed
20. With the brackets in place, the sway bar is installed with the fasteners only finger tight to allow for easy rotation of the sway bar as it’s connected to the lower control arms. These fasteners will be torqued to 30 lb-ft after the endlinks are connected.
mating the sway bar to the lower control arm
21. With the suspension loaded (truck on the ground) the endlink is installed, mating the sway bar to the lower control arm. These fasteners are also torqued to 30 lb-ft
QA1’s front suspension kit
22. In addition to lowering the front of the C10, QA1’s front suspension kit is designed with increased caster and negative camber angles better suited for modern, aggressive wheel-and-tire combos, improving camber gain and overall cornering grip. Polyurethane bushings isolate road noise for a smooth, quiet ride while reducing bind for improved handling.
maintenance-free, low-friction ball joints
23. Another benefit of QA1’s suspension design is the use of their maintenance-free, low-friction ball joints. Installed in every QA1 control arm, the use of ultralow-friction composite bushings eliminate flex and deliver bind-free movement.
CPP’s Zero-Offset SOS Big Brake Kit
24. Of course, a performance-oriented suspension setup wouldn’t be complete without an equally performing brake system. For that end, Cotati opted to use CPP’s Zero-Offset SOS Big Brake Kit with its large, 13-inch rotor and equally oversized caliper.
Installing CPP’s Big Brake Kit
25. Installing CPP’s Big Brake Kit is super easy thanks to the use of their Modular Dropped Spindle and a simple caliper bracket. After the spindle bearings are packed, the aluminum hub is installed, using the provided castle nut and cotter pin to secure things.
13-inch rotor
26. The 13-inch rotor is then slid over the hub’s wheel studs and held in place with a temporary lug nut or two.
one-piece caliper bracket
27. The one-piece caliper bracket is then attached to the Modular Dropped Spindle.
caliper is then attached to the caliper bracket
28. The caliper is then attached to the caliper bracket …
completing the brake installation
29. … completing the brake installation.
earlier C10 trucks
30. The earlier C10 trucks (1963-1970) are required to update the steering linkage to 1973-later parts or, as Cotati opted to do, use QA1 adaptor tie-rod sleeves and all-new steering linkage components from CPP.
500-Series power steering unit from CPP
31. While on the topic of steering, the Cotati crew also opted to upgrade the stock manual steering box with a new 500-Series power steering unit from CPP. This upgrade is a direct bolt-in modification, making it one of the easiest improvements to be made to an early C10.
wrap on the front suspension
32. That’s a wrap on the front suspension on Pete and Leslie’s C10. The Cotati crew have upgraded every component under the frontend of the Chevy with simple, bolt-on parts from Speedway Motors that anyone can install in their driveway and truly convert that old C10 into a modern, road-hugging classic truck.
SOURCES
Classic Performance Products (CPP)
(800) 522-5004
classicperform.com
Cotati Speed Shop
(707) 586-8696
cotatispeedshop.com
Speedway Motors
(800) 979-0122
speedwaymotors.com