BANGING NOISE IN REAR SUSP. CAUSED BY R/SPRING CONTACT

MODELS AFFECTED: 1986 FRONT WHEEL DRIVE LESABRE

There have been some owner comments, on subject models, of a banging type rear suspension noise noticeable on rough roads. This noise was due to rear spring coil contact and was corrected on 1987 front wheel drive LeSabres by new designed springs. To use the 1987 rear springs on a 1986 complaint vehicle, determine the code identification of the springs on the vehicle and obtain a 1987 service spring which has the same "Rate" and comes closest to the "Load" of these springs.

Figure 1 lists the "Rate" and "Load" of the 1986 front wheel drive LeSabres production springs. Figure 2 lists the currently released 1987 LeSabre service springs.

For example, if a 1986 vehicle has code MAS rear springs, the 1987 service springs, Code RRD, Part No. 25530346 should be ordered from GMSPO.

Figure 1 - 1986 Front Wheel Drive LeSabre Production Rear Spring Usage

SUSPENSION Rate Load Part No Code ---------- ---- ---- ------- ---- N/mm N

Std Ride 42-60 3100 25525299 MAN -G67 42-60 3300 25525300 MAP 42-60 3500 25525301 MAR 42-60 3790 25525302 MAS 42-60 4020 25525303 MAT 42-60 4250 25525304 MAV 42-60 4480 25525305 MAW

F40/F41 45-60 3100 25525306 MAX -G67 45-60 3350 22525307 MAY 45-60 3600 25525308 MAZ 45-60 3850 25525309 MBA 45-60 4100 25525310 MBB 45-60 4350 25525311 MBC 4600 4600 25525686 MBD

Figure 2 - 1987 Front Wheel Drive LeSabre Service Rear Spring Chart

BASE 42-60

W/O G 6 7 3464 25530344 RRB 3900 25530346 RRD 4336 25530348 RRH

F40/F41 45-60 W/O G67 3432 25530359 RRL 3900 25530361 RRN 4368 25530363 RRR

G67 = Automatic Level Control Option

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.