SPEAKER GRILLE WARPAGE REPLACE GRILLE WITH NEW P/N

MODELS: 1988 C/K TRUCKS

Some 1988 C/K trucks have experienced speaker grille warpage. A new grille has been designed with stiffening ribs to prevent this condition. Before in- stallation of the new grille (2nd design) it will be necessary to modify the grille and the raised area in the speaker opening of the interior panel. Using the old speaker grille (1st design) as a reference point, file the area on the interior panel that lines up below the old grille notch (see Figure No. 1). On the grille (2nd design) underside measure 4 inches from the rear edge and remove approximately 1/2 inch from the outer stiffening rib (See Figure No. 1). These operations should be performed to accommodate the new grille design and prevent interference.

IMPORTANT: Modification is only required on the RH speaker grille and IP speaker opening. The LH speaker grille will fit as is.

If a plastic grille with this condition requires replacement, service with the paint-to-match base grille stocked by GMSPO. Cloth covered grilles should be replaced by the same color grille stocked by GMSPO.

All Plastic Base Cloth Trim Grille P/N Covered Gille P/N Codes ------ --- ------------- --- ----- (Left) 15613025 Blue (Left) 15613029 241 (Right) 15613026 (Right) 15613030 241 Beige (Left) 15613033 691 (Right) 15613034 691 Gamet Red (Left) 15613035 781 (Right) 15613036 781 Gray(Left) 15613037 821 (Right) 15613038 821

Parts are currently available from GMSPO.

For repairs to vehicles under warranty, use:

Labor Op: R0910 - Front Right R0911 - Front Left

Labor Time: .2 Hr Add: .3 Hr - If base grille must be color coated

NOTE: - 2ND DESIGN SPEAKER GRILLE DOES NOT HAVE A NOTCH FOR ORIENTATION TO IP.

- 2ND DESIGN IP DOES NOT HAVE AN ELEVATED AREA THAT CORRESPONDS TO THE 1ST DESIGN SPEAKER GRILLE NOTCH.

- WHEN A NEW STYLE (2ND DESIGN) GRILLE IS USED IN COMBINATION WITH A 1ST DESIGN IP,THE ELEVATED AREA OF THE IP THAT CORRESPONDS TO THE NOTCH MUST BE FILED SMOOTH TO ACCOMODATE THE 2ND DESIGN GRILLE ON THE R.H. SIDE ONLY.

- MODIFICATION OF THE R.H. NEW STYLE (2ND DESIGN) GRILLE UNDERSIDE IS REQUIRED. MEASURE 4 INCHES FROM REAR EDGE AND REMOVE 1/2 INCH FROM THE OUTER STIFFENING RIB. THIS WILL ALLOW FOR A FLUSH FIT TO THE IP

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.