B.C. Racing coilovers for a 2005-up
Pontiac Grand Prix (PN ZB05BR) are
rated at 500 lb/in. The strut outer
body is threaded, so increasing or
decreasing the ride height with
twist collars is independent of the
wheel-load setting. To accept 15x10-
inch front rims, the strut body was
trimmed, some 10.9-inch rotors and
single-piston calipers from a 2000
Pontiac Grand Prix GTP replace the
stock 11.9-inch Monte Carlo SS rotors,
and^5 ⁄ 8 -inch-thick spacers inserted
between the discs and rims.
The lower control-arm bushings are
stock. Deep contours of control arms
allow contact-free, full-lock turns
with the slicks. The front and rear
antiroll bars are removed to increase
dynamic weight transfer and
suspension rise/squat.
“The factory transaxle mount is a
rubber unit with plenty of unwanted
motion,” Brandon says. This solid-
aluminum prototype may go into
production if demand warrants it. The
stock^7 ⁄ 8 -inch-diameter Monte Carlo
axleshafts were replaced with stronger
11 ⁄ 8 -inch-diameter units from a 1993
Caddy El Dorado (driver side) and a
1995 Olds Aurora V8 (passenger side).
Brandon credits David from Triple Edge
Performance in Ft. Wayne, Indiana, for
sharing this extra-duty driveline recipe.
Below: Out back, the rear suspension
uses even stiffer 600-lb/in B.C. Racing
coilovers with the rear antisway bar
removed. Brandon has the rear shock
towers cranked to the maximum: “I
want the body to remain as flat as
possible.”