A BMW X5 SUV came into the shop on the hook with a no-move condition and a major leak from a cooler line.
Along with this new transmission came a new torque converter, manufactured by ZF Sachs. The converter may look somewhat similar to its predecessor, but, as they say, looks can be deceiving. The stator in the 68RFE converter is the same type that was used in the 47-48 RE converters, but that is where the similarities end. The turbine looks as if it is the same as the earlier models, but appearance is all they have in common.
How honest are we with ourselves in regard to our safety practices? Do we occasionally find ourselves cutting corners or ignoring safety practices in our bays?
If you have ever driven an Audi A8 or any other high-end car using a ZF 5HP19 or 5HP24 transmission, you know these units are pretty smooth shifting and lockup is almost undetectable. This particular Audi came in with a customer complaint of a clunk or bump when the vehicle slowed. Initially, the car was diagnosed, and the unit was removed and rebuilt.
The reference to finishing the swing has to do with the completeness of our actions. In golf, if you stop the swing just as the club makes contact, the ball isn’t likely to go very far or straight or up in the air for that matter. Any pro will tell you that you have to finish the swing, meaning to follow through, if you want good, consistent results.
Noise is one of the great mysteries of the transmission world. Noise is subjective, and people rarely can interpret noises in the same manner. Noise travels much faster and farther in solid objects such as the steel of an automobile than it does in air. There is driveline noise, engine noise, suspension noise, exhaust noise and road-generated noise.
In past articles and bulletins we have talked about functions of the torque-converter-clutch (TCC) solenoid on the 4L30-E family and how on BMW and 2000-up Isuzu models this solenoid is responsible for TCC application and a reverse-inhibit solenoid. The U140/240 series has “one-upped” that, as we are going to find out in the following illustrations.
In This Issue
Chrysler PCI(Programmable Controller Interface)
Module-to-Module Bus Communication, Part 1