 One of the classic ways to...  One of the classic ways to adjust the instant center on a Chevelle is with this package from Art Morrison Enterprises that includes the steel adapters that relocate the upper rear-control-arm mounting point higher to shorten the instant center. The full kit includes adjustable upper arms with steel rod ends along with tubular lower arms, shocks, and all the hardware. |  We got this budget pinion-angle...  We got this budget pinion-angle trick from Just Suspension. To drop the pinion angle, merely elongate the rear hole in the upper control arm until you have the proper pinion angle. Then spot-weld these hardened 1/2-inch washers over the hole to establish the proper bolt position. It's as easy as that. |  This mock-up photo gives you...  This mock-up photo gives you an idea of how the Lakewood or Art Morrison bars relocate the upper control higher to change the instant center. |
 Global West offers these slick...  Global West offers these slick tubular lower control arms that are fitted with an encased spherical bearing in the front to allow the bar to articulate during street operation. The rear connection is a Del-A-Lum bushing that offers zero deflection to precisely locate the rear axle. |  All factory big-block '66...  All factory big-block '66 and '67 Chevelles came with a stamped-steel brace (arrow) between the upper and lower control-arm mounting points. Starting with the '68, most Chevelles (regardless of the engine) came with the braces. Edelbrock (shown), Hotchkis, and several other companies offer versions of this brace. |  This illustration (looking...  This illustration (looking forward from behind the car) reveals why a posi is merely a crutch to fix a spinning right-rear tire. When the car launches, the pinion gear in the rearend tries to climb the ring gear, unloading downward pressure from the right rear tire. This occurs in any solid-rear-axle vehicle and explains why non-posi-equipped cars spin the right-rear tire. |