6000 V6-260 4.3L DSL (1982)
Turbine Shaft: All Technical Service Bulletins
Torque Converter - Shudder Immediately After Engagement
Number
83-T-34
Section 7
Date 05/83
Subject:
TORQUE CONVERTER SHUDDER - SUPPLEMENT TO BULLETINS 82-T-87 AND 83-I-51 - 1982 AND 1983 THM 125C TRANSMISSION
Some 1982 and 1983 THM 125C transmissions may experience a torque converter shudder condition immediately following the torque converter clutch
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-T-87.
Figure 2
1.
An incorrectly machined seal groove on the turbine shaft in the transmission. A step in the bottom corners of the seal groove (see Figure 2 below)
will prevent the P.T.F.E. 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 1
2.
Particles of gasket material sticking the 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 (see Figure 1 above) 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.
