Speedometer - Noisy/Inoperative

87chevy13

GMC NUMBER: 87-T-80

GROUP: 8C-Instrument Panel & Gages

DATE: August, 1987

CORPORATE
NUMBER: 768301

SUBJECT: NOISY OR INOPERATIVE SPEEDOMETER

MODELS: 1985-1987 C/K AND R/V 2,3 MODELS WITH 4.8L, 5.7L, OR 7.4L CARBURETED

ENGINES

Some 1985, 1986, and 1987 C/K and R/V model trucks may experience a noisy or inoperative speedometer. This condition may be caused by the speedometer cable contacting the engine exhaust between the cable connection on the transmission or transfer case and the first cable clamp located on the floor pan. If the contact occurs, the high exhaust temperature may damage the speedometer cable.

FIGURE NO.. 1:

FIGURE NO. 2:

A new design speedometer cable has been released to repair this condition when found (See Figure No. 1 for K/V models, Figure No. 2 for C/R models). The new cable has a foam collar where it mates with the first clamp, that when clamped, holds the cable in correct alignment and prevents cable droop. The new gray cable is also three

inches shorter than the black cable it replaces. Follow the procedure in Section 8C of the Light Duty Truck Service Manual to install the new cable.

PARTS INFORMATION

Part
Number Description Application Quantity
15549223 Cable Assembly K and V 2,3 with 1
4.8L, 5.7L, 7.4L
All Transmissions

15549220 Cable Assembly C and R 3 with 4.84 1
5.7L, 7.4L with M40
Automatic Transmission