Campaign - Incorrect Speedometer Gear: Overview

Number: 82C30
Section: VII
Date: March, 1983
Subject: PRODUCT CAMPAIGN 82C30 INCORRECT SPEEDOMETER DRIVEN GEAR 1982 K20 LIGHT DUTY CHEVROLET TRUCKS EQUIPPED WITH RPO'S LH6 (DIESEL ENGINE), MM7 (4-SPEED OVERDRIVE MANUAL TRANSMISSION) AND GT4 (3.73 RATIO REAR AXLE)
TO ALL INVOLVED CHEVROLET DEALERS

General Motors has determined that some 1982 K20 Chevrolet Light Duty Trucks equipped with RPO LH6 (diesel engine), MM7 (4-speed overdrive manual transmission) and GT4 (3.73 ratio) rear axle were assembled with the incorrect drivedriven gear and sleeve assembly.

The incorrect speedometer driven gear will result in the speedometer indicating a vehicle speed which is approximately 20% slower than the actual vehicle speed. For example, when the actual vehicle speed is 50 mph, the speedometer will indicate approximately 40 mph.

To correct this condition, the speedometer driven gear and sleeve assemblies will be replaced in all involved vehicles.