NHTSA Engineering Analysis EA03019

GM'S LETTER TO NHTSA DATED DECEMBER 11, 2003, EXPANDS ITS ORIGINAL RECALL (NHTSA 02V286) TO INCLUDE CERTAIN W-BODY VEHICLES: 96-97 OLDS CUTLASS SUPREME; 98 OLDS INTRIGUE; 97-98 OLDS CUTLASS; 97-98 CHEVY LUMINA, MONTE CARLO AND MALIBU; 96 PONTIAC GRAND PRIX; AND 96-98 BUICK REGAL.THE NUMBER OF VEHICLES RECALLED IS 750,283.GM DETERMINED THAT FAILURE OF THE RACK AND PINION IS RELATED TO DAMAGE OF THE LOWER PINION BEARING AND THE LEVEL OF THE PINION BEARING PRE-LOAD SPRING FORCE.GM STATES, HIGHER RACK PRE-LOAD SPRING FORCE (133 LB.) IS THE DESIGN CHARACTERISTIC MOST CLOSELY ASSOCIATED WITH HIGHER BEARING DAMAGE RATES IN MOST OF THE VEHICLE APPLICATIONS THAT USED THE GENERAL BEARING COMPANY (GBC) BEARING.ALL OF THE VEHICLES COVERED IN THE EXPANDED RECALL HAVE THE 133 LB SPRING FORCE.THE 96 LUMINA/MONTE CARLO AND 97-98 CENTURY W-BODY VEHICLES INCLUDED IN THIS INVESTIGATION UTILIZE A LOWER SPRING FORCE AND ARE NOT INCLUDED IN THE RECALL.