GMC JE8500 1974: POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH

General Information

NHTSA Campaign ID Number: 74V226000

Make Model Year
GMC JE8500 1974
Date Owners Notified Date Received by ODI Date Added to Database
1974-11-27 1974-11-21 1979-10-12

Manufacturers Involved: General Motors, LLC

Component: POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH

Potential Number Of Units Affected: 811

Report Initiator: MFR MFR Report

Notes

CHEVROLET CAMPAIGN NO 74-C-19.POSSIBILITY WHEN THE ALLISON MT-650TRANSMISSION IS MATCHED WITH EITHER THE 366 OR 427 CID V-8 ENGINES, THE 1,3 TO1,0 GOVERNOR DRIVE-TO-DRIVEN GEAR RATION CAN CREATE EXCESSIVE GOVERNOR RPM WHENOPERATED IN TOP GEAR AT OR NEAR MAXIMUM RATED ENGINE SPEED RPM OF 4000.THEEXCESSIVE GOVERNOR SPEED CAN RESULT IN A GOVERNOR DRIVEN GEAR FAILURE.AFAILURE OF THIS TYPE CAN CAUSE A DOWN SHIFT OF THE TRANSMISSION WITHOUTWARNING.IF THIS OCCURS, TRANSMISSION AND ENGINE SPEED WOULD INCREASE GREATLYAND MAY RESULT IN ONE OF THESE COMPONENTS BREAKING.'CORRECT BY INSPECTING ANDINSTALLING NEW TRANSMISSION REAR HOUSING ASSEMBLY AND GOVERNOR WITH 1.0 TO 1.0 DRIVE-TO-DRIVEN RATIO.'