A/T - Apparent Loss of Engine Power

Model Year 1983

Bulletin No. 83-174

File in Group 70

Number 32

Date Aug. '83

SUBJECT: Apparent Loss of Engine Power

MODELS AFFECTED: 1982 & 1983 THM 325-4L Transmissions - All Models


Some 1982 and 1983 vehicles equipped with a THM 325-4L transmission may exhibit an apparent loss of engine power. This condition may be caused by an incorrect application of the low and reverse clutch assembly, during third speed operation.

FIGURE 1:

This condition is caused by a missing coiled spring pin that is used for locating the Lo-1st detent valve bushing in the control valve assembly. (Figure #1). The absence of the coiled spring pin allows the Lo-1st detent valve bushing to rotate in its bore, allowing detent oil to apply the low and reverse clutch.

When servicing any 1982 and 1983 THM 325-4L for this apparent loss of engine power condition, inspect the Lo-1st detent valve bushing for correct orientation in its bore (Figure #1). If the bushing is found misoriented and the coiled spring is missing, reorientate the bushing in its bore and install a coiled spring pin (Part #8628400).