i was wondering how the transmission in the new GM trucks (4l70) would go with ls1s. would the 4l80 still be better? anyone know anything about this? just curious

 

the 4l70 guts can be used in the 4l60 4l65 from my understanding of it. a 4l80e will always be stronger.

 

I had to tear one down at work the other day on a 07 tahoe, the only difference from 4l60e is a electronic control valve or something on the fluid pump. Other than that, I don't believe they are any stronger.

 

They are very similar units and the 4l70e is comparable to the 4l65e and the 4l60e as far as strength goes

 

Basically the 4l70e is a modified 4l65e. The difference is that with the 4l70e GM has introduced an input speed sensor or a turbine speed sensor. To accommodate this sensor GM redesigned the pump, stator, internal wiring harness, input shaft, and the speed sensor itself that plugs into the internal wiring harness. Here are some pic's that I took when building one for a customer.
This first picture is of the input shaft. This is what the sensor reads off of.

This next picture is the sensor mounted to the pump.

This picture shows how it is bolted to the pump.

This next picture shows where the sensor comes through the pump stator to read off the input shaft. It is kind of hard to see but it is the hole in the middle on the bottom of the sleeve in the stator.

This next picture is where the internal lock up harness will plug into the speed sensor.

Here are a couple of pictures of the internal lockup harness and the speed sensor harness.

 

How is the data from this new sensor set-up utilized in powertrain management?