Copyright © 1996 General Motors Corp. 3–29
PREVENTIVE MAINTENANCE
PREVENTIVE MAINTENANCE
A. Abnormal Stall Check Speed (cont’d)
High stall speeds (cont’d) Fourth clutch (reverse) slipping. Rebuild fourth clutch. Refer to Para-
graph 6–11.
Low stall speeds Engine not performing efficiently
(may be due to plugged or restricted
injectors or high altitude conditions).
Refer to engine manufacturer’s man-
ual or vehicle service manual.
Broken converter parts. Replace or rebuild converter assem-
bly.*** Refer to Paragraph 6–4.
Stall speeds of 50 percent of normal
(implies freewheeling stator).
Replace or rebuild converter assem-
bly.*** Refer to Paragraph 6–4.
B. Leaking Fluid
Fluid leaking into converter housing Engine crankshaft rear oil seal leak-
age.
Refer to vehicle service manual.
Metal-encased lip type seal at front
of input charging pump leaking.
Replace pump seal. Refer to Para-
graphs 6–7a(6) and 6–6d(10) or
(12).
Seal around OD of oil pump leaking. Replace OD pump seal. Refer to
Paragraphs 6–7a(5) and 6–6d(13).
Cracked weld in torque converter
assembly leaking.
Replace or repair converter assem-
bly.*** Refer to Paragraph 6–4.
Torque converter pump hub worn at
seal area.
Replace torque converter pump
hub.*** Refer to Paragraph 6–4.
Fluid leak at output shaft Faulty or missing seal at output
flange.
Install new seal in rear of transmis-
sion housing. Refer to Paragraphs
3–16b and g.
Flange worn at seal surface. Replace flange. Refer to Paragraphs
3–16b and h.
*** Note: Except for AT 543 models, no repairs can be made because the torque converter assembly is closed and welded after assembly of the
internal parts.
Table 3–13. Troubleshooting Chart (cont’d)
Problem Probable Causes Suggested Remedies
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