A/T - Forward Clutch Plate Assembly Modifications
85-637A (VIIc)
APR., 1985
Subject: FORWARD CLUTCH PLATE ASSEMBLY
Model and Year: 1982-85 THM 700-R4
TO: ALL CHEVROLET DEALERS
At the start of production of the 1985 THM 700-R4 transmission, ALL MODELS will be built with thicker steel clutch plates and thinner composition clutch plates in the forward clutch assembly.
NOTICE: THE THICKNESS CHANGE IN THE PLATES DOES NOT AFFECT THE OVERALL "STACK UP" DIMENSION FOR THE FORWARD CLUTCH ASSEMBLY WHEN USED IN SETS AS SHOWN BELOW. DO NOT MIX THE NEW PLATES WITH PLATES FOR TRANSMISSIONS BUILT PRIOR TO THE 1985 MODEL YEAR. USE A MICROMETER TO INSURE THE PROPER PLATE USAGE.
Your parts catalog should reflect information contained in the chart below.
PART NUMBER PART NAME THICKNESS MODEL YEAR
8642167 FORWARD CLUTCH PLATE 1.97 mm (.077") 1982-1984
8647350 FORWARD CLUTCH PLATE ASSEMBLY 2.03 mm (.079") 1982-1984
8654325 FORWARD CLUTCH PLATE 2.29 mm (.090") 1985
8654324 FORWARD CLUTCH PLATE ASSEMBLY 1.78 mm (.070") 1985
8642991 OVERHAUL REPAIR PACKAGE 1982-1984
8647980 OVERHAUL REPAIR PACKAGE 1985