Phoenix L4-151 2.5L VIN 5 2-bbl (1982)
Technical Service Bulletin # 84733A
Date: 840901
A/T - Torque Converter Clutch Shudder
Number 84-7-33A
Date
9/84
Subject:
TORQUE CONVERTER CLUTCH SHUDDER--THM 125-C
Some THM 125C transmission may exhibit torque converter clutch (T..C.C.) shudder as the TCC applies and/or after it applies when the accelerator
pedal is depressed slowly (Crowd Shudder). These types of shudders are best described as a jerking sensation. In some cases the shudder may cause the
instrument panel to vibrate.
Listed below are items which may cause a "TCC Apply Shudder" and/or a "TCC Crowd Shudder".
TCC Crowd Shudder & TCC Apply Shudder
CONDITION
CAUSE AND CORRECTION
TCC APPLY
TCC CROWD
SHUDDER
SHUDDER
X
X
1.
An intermittent incorrect
signal from the vehicle speed sensor (V.S.S.). Dirt or grease on the
reflective bar in the V.S.S. may be sending an incorrect or erratic signal so
that the converter clutch engages early. Remove the V.S.S. and clean it.
X
X
2.
The auxiliary valve body cover
attaching bolts may be loose or the bolt threads/holes may be shallow. If the
holes are shallow, the bolts will bottom out without torquing the cover
down.
X
3.
Some 1982 models were built
with either an exhaust hole or an orifice cup plug in the auxiliary valve body
cover. The valve body cover was
CONDITION
CAUSE AND CORRECTION
TCC APPLY
TCC CROWD
SHUDDER
SHUDDER
changed to a solid cover (no exhaust hole or orifice cup plug) in 1982. The service auxiliary valve body cover, part number 8643645, should be used on
a11 models to prevent shudder. The service part does not have an orifice cup plug.
Figure 1