© 2008 ATRA. All Rights Reserved. GENERAL MOTORS 37 6T40 (RPO MH8,MHB) 6T45 (RPO MH7,MHC) The 6T40/45 utilize a thermal type element to control the oil level in the unit similar to other GM units. Known as a “Fluid Level Control Valve” the unit is basically a thermally controlled stand pipe. At temperatures below 60°C (140°F) fluid is allowed to drain into the sump. At temps above 60°C (140°F) drain back is blocked, allowing the side cover (valve body area) to fill with fluid. If you are changing fluid in these units make sure the unit is cold. If you remove the drain plug in the bottom of the case only about 50% of the fluid in the unit will drain, You will need to remove the bottom pan as with other transmissions to completely drain the unit. To check the fluid level, the transaxle TFT value must fall between 85°C-95°C (185°F-203°F). Checking the Fluid Level Fluid temp can be checked from the “driver information center” or by using a scan tool. It is critical that the fluid be at the correct temperature or an overfill or under fill condi- tion may occur. These units are very sensitive to overfill. As little as ½ qt overfull can lead to fluid leaking from the vent. Fluid level is checked with the engine running, fluid temp 85°C-95°C (185°F-203°F), in park, via a plug (most applications) near the axle seal area in the case.

GENERAL MOTORS 6T40 (RPO MH8,MHB) 6T45 (RPO MH7,MHC) · © 2008 ATRA. All Rights Reserved. GENERAL MOTORS 37 6T40 (RPO MH8,MHB) 6T45 (RPO MH7,MHC) The 6T40/45 utilize a thermal type

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GENERAL MOTORS 37

6T40 (RPO MH8,MHB)6T45 (RPO MH7,MHC)

The 6T40/45 utilize a thermal type element to control the oil level in the unit similar to other GM units. Known as a “Fluid Level Control Valve” the unit is basically a thermally controlled stand pipe.

At temperatures below 60°C (140°F) fluid is allowed to drain into the sump. At temps above 60°C (140°F) drain back is blocked, allowing the side cover (valve body area) to fill with fluid.

If you are changing fluid in these units make sure the unit is cold. If you remove the drain plug in the bottom of the case only about 50% of the fluid in the unit will drain, You will need to remove the bottom pan as with other transmissions to completely drain the unit. To check the fluid level, the transaxle TFT value must fall between 85°C-95°C (185°F-203°F).

Checking the Fluid Level

Fluid temp can be checked from the “driver information center” or by using a scan tool. It is critical that the fluid be at the correct temperature or an overfill or under fill condi-tion may occur. These units are very sensitive to overfill. As little as ½ qt overfull can lead to fluid leaking from the vent. Fluid level is checked with the engine running, fluid temp 85°C-95°C (185°F-203°F), in park, via a plug (most applications) near the axle seal area in the case.