You can check the level, but you need to have all 4 wheels off the ground and level as you would on a lift. Then you remove the inspection plug while the engine is running to check the level. I suppose they were looking to shut out the DIY on this one. That said, it sounds like you got it solved.

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All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin has been performed on the vehicle. These vehicles may have a condition in which the transmission turbine shaft may fracture. If this occurs while in first or second gear, there will be no effect on performance but no upshift to third through sixth gears will occur.

If the fracture occurs while in third through sixth gears, the vehicle will coast until it slows enough for a downshift to first or second gear to occur, increasing the risk of a crash.

In both instances, a MIL Malfunction Indicator Lamp may illuminate and all of the forward gears may become inoperative if operated in this manner for a long period of time minutes or hours. The engine will continue to run and all power accessories will remain functional.

It is important to routinely use this tool to verify eligibility because not all similar vehicles may be involved regardless of description or option content. Copyright General Motors. All Rights Reserved. Page 2 August Bulletin No. Dealers will not have a report available if they have no involved vehicles currently assigned. The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. Accordingly, you are urged to limit the use of this report to the follow- up necessary to complete this recall.


GM 6-Speed 6T30 MH9 Hydra-Matic Automatic Transmission

The Hydra-Matic 6T30 transmission delivers on that promise. Shared traits between the 6TXX family — and other Hydra-Matic six-speeds is to reduce complexity, size and mass, including clutch-to-clutch operation that enables the six-speed to be packaged into approximately the same space as a four-speed automatic. Because of the wide ratio spread, first gear is a very high ratio, which provides brisk acceleration from a stop. Sixth gear, however, is an overdrive ratio, which keeps the engine revolutions lower for highway cruising, reducing engine friction losses and optimizing fuel economy. The advantages of this layout enables a shorter overall vehicle length, more interior room and lower powertrain height. Clutch-To-Clutch Shift Operation Three planetary gearsets are used with three stationary clutches and two rotating clutches, which save space compared to freewheeling designs.


6T30 6T40 6T45 6T50 GM 6F35 FORD


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