A/T - Shift Busyness, Harsh 1-2 Shift or 3-2 Shift Flare
Model Year 1983Bulletin No. 83-169A
File in Group 70
Number
30A
Date Sept.. '84
SUBJECT: SHIFT "BUSYNESS" (CYCLING BETWEEN FOURTH AND THIRD GEARS) HARSH 1-2 SHIFT OR 3-2 SHIFT FLARE
MODELS AFFECTED: 1982-83 RIVIERAS EQUIPPED WITH 5.0L ENGINES (VIN CODE Y) AND THM 325-4L MODEL "OE" TRANSMISSIONS
NOTICE: This information supercedes and updates Bulletin 83-169, Group 70, #30. Please discard previous bulletin and replace it with this one.
Some 1982 and 1983 Rivieras with 5.0L engines (VIN Code Y) and THM 325-4L model "OE" transmissions may experience a shift "busyness" which is most noticeable while driving up inclines and in cruise control. "Busyness" refers to cycling between fourth and third gear.
Beginning on February 2, 1983, a revised control valve assembly went into production for all 1983 THM 325-4L "OE" model transmissions to correct this condition. This assembly also improves a harsh 1-2 shift and a 3-2 shift flare.
When servicing any 1982 or 1983 THM 325-4L "OE" model transmission produced before the above date for any of these conditions order service package number 8635953. This package contains:
Control valve assembly Pressure regulator spring Intermediate servo cushion spring Control valve spacer plate 3-4 accumulator spring Instruction sheet
Refer to the instruction sheet contained in the service package as well as the service manual for proper removal and installation procedures of the items contained in this package.
NOTICE: To complete this revision on 1982 Rivieras, the cruise control servo should be checked. If the servo housing is black in color, it should be replaced with servo part #25031846, which is gray in color.