Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2011 and prior GM passenger cars and light duty trucks with an automatic transmission/transaxle.

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  2011 and Prior GM Passenger Cars and Light Duty Trucks

• In flow mode, an electronic flow meter measures the flow capability of the ATF oil cooling system.

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  In the flow mode, an electronic flow meter is used to measure the flow capability of the ATF oil cooling system.

Steps to confirm (in the document’s order)

1. On the 4L60-E, the cooler feed (exiting the transmission) is the bottom connector and the return (entering the transmission) is the top connector; J-35944-200 may be required.

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   4L60-E bottom connector (may require J- 35944-200) top connector (may require J-35944- 200)

2. On the 4L80-E, the cooler feed is the front connector and the return is the rear connector; J-35944-200 may be required.

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   4L80-E front connector (may require J- 35944-200) rear connector (may require J- 35944-200)

Repair

• For the flow test and flush procedure, refer to Automatic Transmission Oil Cooler Flushing and Flow Test J-45096 in SI.

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  Refer to SI for Automatic Transmission Oil Cooler Flushing and Flow Test J-45096 for the appropriate procedure.

Caution

• Insufficient oil flow through the ATF oil cooling system will cause premature transmission failure; the required minimum flow rate depends directly on the supply oil temperature.

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  Insufficient oil flow through the ATF oil cooling system will cause premature transmission failure. The required minimum ATF oil flow rate reading is directly related to the supply oil temperature.

• The oil in the supply vessel must be 18°C (65°F) or warmer for the J-45096 to operate.

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  The temperature of the supply vessel oil must be 18°C (65°F) or greater for the J-45096 to operate.

• Labor operations that remove the transmission for an internal repair or torque converter replacement include time to flow check and flush the transmission oil cooler system.

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  All Labor Operations that include removal of the transmission from the vehicle to perform an internal repair or torque converter replacement include labor time to flow check and flush the transmission oil cooler system.

• A flow test and flush uses between 4.7-7.5 L (5-8 qts) of DEXRON VI transmission fluid.

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  Performing a transmission oil cooling system flow test and flush will use between 4.7-7.5 L (5-8 qts) of DEXRON®VI transmission fluid.