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.

 

Vince....quick question.....they 60e and 70e use identical housings externally right? and would use the same yoke and driveshaft?

 

I believe this to be true. What does the sticker on you trans as far as an ID?

 

So is there a way to make this a direct swap for us with the 60/65E? What would be the advantage?

 

At this point a 70 is a modified 65 from what I can see. I am not aware of an advantage. I do want to have some of the 70 parts checked for hardness. We are working on some new parts for the level 5 4l65e and also for the 70.

 

New parts..Hmmm...must be to make a stronger level 5 trans than current! I like..............

Jim

 

Is that speed sensor the one that reads vehicle speed? Why would they move that up front?

 

No it is a input/turbine speed sensor. It does not read as a VSS.

 

hey Vince, do you have a shift kit for the 70e yet? i looked at the transgo but it doesnt list for the 70e. also are the servo's the same as a 60e? looking at easy upgrades without pulling the tranny out for now. anything else you recomend?

 

I was curious if you could put a corvette servo in without GM knowing if it breaks.