4L60-E, 4L65-E, 4L70-E HYDRA-MATIC® Automatic Transmission RPOs M30, M70, M32, M33, MK2, MD6 Oil Cooler Fitting Change (08-07-30-004)

Publication date: 2008-01-31
Reference number: 08-07-30-004

4L60-E, 4L65-E, 4L70-E HYDRA-MATIC® Automatic Transmission RPOs M30, M70, M32, M33, MK2, MD6 Oil Cooler Fitting Change

TECHNICAL SERVICE BULLETIN

Reference Number(s): 08-07-30-004, Date of Issue: January 31, 2008

Affected Model(s):

1997-2008 GM Light Duty Trucks (Including Saab); with 4L60-E, 4L65-E, 4L70-E HYDRA-MATIC® Automatic Transmission (RPOs M30, M70, M32, M33, MK2, MD6)

SERVICE INFORMATION

Fig 1: View Of Old & New Fittings

Courtesy of GENERAL MOTORS CORP.

Aluminum cooler line fittings - These new fittings (2) cannot be used on earlier cases because the threaded hole is not the same size. Old style fittings (1) will continue to be available through SPO parts.

Service cases will be the new case and fittings. The old cases with the old thread design will not be maintained for service.

The connection on the hose side will accept both the short snout and the newer longer snout cooler hose assemblies.

Fig 2: Locating Fittings

Courtesy of GENERAL MOTORS CORP.

The fittings (1) have a new torque specification of 20 N.m (14 lb ft). They also have one inner and one outer "O" ring that are not serviced separately. The new thread size 9/16-18 UNF-2A (1) was implemented on 11-29-07 or Julian date 333.