Technical Service Information
GM 6L80/90
FLARE 2-3 AND OR ENGAGEMENT CONCERNS
COMPLAINT: GM vehicles equipped with the 6L80/90 transmission, built prior to December of 2008 may
exhibit a complaint of a flared 2-3 upshift or a delayed with harsh application into Forward
and/or Reverse engagements. Note: this complaint has been linked more to a cold condition
but may show up at any time.
CAUSE: The cause may be, leakage in the sealing ring area on the pump cover which feeds the 1-2-3-4
and 3-5-Reverse Clutch packs, causing a slow application, which can also cause elevated
pressure as the TCM may try to adjust for the slow application.
CORRECTION: To correct this condition, replace the previous design pump cover with the one piece sealing
rings , as shown in Figure 1, with the new design pump cover that now is a two piece design
with anti-rotational tabs and a machining process that was performed on the ring land to
accommodate the new tabs on the sealing rings. Note: This two piece sealing ring design was
updated to prevent leakage in the 1-2-3-4 and 3-5-Reverse Clutch apply circuits and will
retro-fit to previous models as a complete assembly. Refer to Figure 3 to see the mandatory
pump alignment ring that must be used when replacing the pump cover. Figure 3 also shows
the available alignment tools, and Figure 4 shows the bolt torque and sequence used when
replacing the pump cover.
SERVICE INFORMATION:
PUMP COVER 2 PIECE SEALING RING DESIGN..............................................24248573
(New cover comes with rings already installed)
NOTE: This pump cover is also available from aftermarket sources.
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AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
PREVIOUS DESIGN PUMP COVER
Previous design 230
Plastic rings
229
219
219 OIL PUMP COVER ASSEMBLY
229 1-2-3-4 AND 3-5 REVERSE HOUSING THRUST WASHER
230 1-2-3-4 AND 3-5 REVERSE SEAL RINGS (3 REQUIRED)
Copyright © 2013 ATSG
Figure 1 13-17
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AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
NEW DESIGN PUMP COVER
New design 230
Plastic rings
that are tabbed
in place
230A
“O”-rings
are installed before
the Sealing rings
229
Cover is notched to
accommodate the new
tabs on the Sealing rings
219
219 OIL PUMP COVER ASSEMBLY
229 1-2-3-4 AND 3-5 REVERSE HOUSING THRUST WASHER
230A 1-2-3-4 AND 3-5 REVERSE SEAL RINGS “O” -rings (3 REQUIRED)
230 1-2-3-4 AND 3-5 REVERSE SEAL RINGS (3 REQUIRED)
Copyright © 2013 ATSG
Figure 2
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AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
ALIGNMENT TOOL INSTALLATION
ADAPT-A-CASE
T-46664AC PUMP COVER
ALIGNMENT TOOL
ARIZONA TRANSMISSION
MACHINE INC.
ALIGNMENT TOOL
J-46664 PUMP COVER
ALIGNMENT GM TOOL
J-46664
INSTALLED
TORQUE BOLTS TO:
11 N·M (97 IN.LB.)
see figure 4 for sequence Copyright © 2013 ATSG
Figure 3 13-17
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AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
BOLT TORQUE SEQUENCE
TORQUE BOLTS TO:
11 N·M (97 IN.LB.)
Note: Torque the 13 oil pump cover retaining bolts to 11 Nm (97 in.lb.) using the sequence shown
above starting with number 1.
Copyright © 2013 ATSG
Figure 4
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AUTOMATIC TRANSMISSION SERVICE GROUP
