TCC - Shudder
Model Year 1983Bulletin No. 83-126
File In Group 70
Number 14
Date May '83
SUBJECT: TORQUE CONVERTER SHUDDER - SUPPLEMENT TO BULLETIN 82-I-227A ON 1982-83 THM 125-C TRANSMISSIONS
Some 1982 and 1983 THM 125-C transmissions may experience a torque converter shudder condition, immediately following the torque converter engagement. Other suspected causes for this condition could be one or more of the items listed below. Inspect for the following conditions along with those specified in bulletin 82-I-227A, file group 70, No. 68, dated November, 1982.
FIGURE 1 - TURBINE SHAFT SEAL GROOVES:
1. An incorrectly machined seal groove on the turbine shaft in the transmission. A step in the bottom corners of the seal groove (Fig. 1) will prevent the turbine shaft seal from contacting the side wall of the groove, and will not seal. If this condition is found, replace the turbine shaft, and seals. Follow service manual procedures for installing and sizing the seals.
FIGURE 2 - AUXILIARY VALVE BODY TO COVER GASKET:
2. Particles of gasket material sticking the [1][2]torque converter clutch apply valve or plugging the converter release orifice in the control valve spacer plate. If a torn gasket is found, remove the gasket material from either the converter clutch apply valve or the control valve spacer-plate. Replace the torn gasket, with a new gasket, but first remove area marked (in Fig. 2) by carefully cutting with a knife.
3. An intermittent incorrect signal from the vehicle speed sensor (V.S.S.). Dirt or grease on the magnet field plate in the V.S.S. might be sending an early signal so that the converter clutch engages early. Remove the V.S.S. and clean it.
4. A leak between the turbine shaft I.D. and the inner turbine shaft sleeve. If all of the items above have been performed and the condition still exists, replace the turbine shaft.