4l70e tech info

[VinceATFLT]

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.
This first picture is of the input shaft. This is what the sensor reads off of.
http://i110.photobucket.com/albums/n97/Vinceflt/100_0305.jpg
This next picture is the sensor mounted to the pump.
http://i110.photobucket.com/albums/n97/Vinceflt/100_0277.jpg
This picture shows how it is bolted to the pump.
http://i110.photobucket.com/albums/n97/Vinceflt/100_0267.jpg
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.
http://i110.photobucket.com/albums/n97/Vinceflt/100_0266.jpg
This next picture is where the internal lock up harness will plug into the speed sensor.
http://i110.photobucket.com/albums/n97/Vinceflt/100_0276.jpg
Here are a couple of pictures of the internal lockup harness and the speed sensor harness.
http://i110.photobucket.com/albums/n97/Vinceflt/100_0289.jpg
http://i110.photobucket.com/albums/n97/Vinceflt/100_0290.jpg

[rrmccabe]

Thanks Vince, have wondered what that looked like.

Now if someone could figure out why the speedo quits at WOT when you add a stall !!

Chuck has some parts on order for me for my upcoming stall install. Nothing big but look forward to getting it going.

Thanks again. Appreciate FLT's insite.

Rich

[Lunchbox RR]

Right on for the info Vince !!!
Now, I have alittle more insight of the internals, I'm thinking about a shiftkit for the 4l70E !!!

[VinceATFLT]

At this point I do not think that there is one. I did use the transgo hd-2 kit for this trans. I will tell you that it was a custom 1 off deal. The problem is that you must remove the pump to do the boost valve and the pr springs. Also the boost valve supplied in the transgo kit had to be machined do to the pump changes. At this point we are testing this combo to see how it is going to work. I have heard that transgo is working on it although sometimes as people say "if you want things done you have to do them yourself".

As far as the speedo not working at wot, I think that this probably do to this added sensor. I am not a tuner but I'm sure someone is working on it.

[rrmccabe]

As far as the speedo not working at wot, I think that this probably do to this added sensor. I am not a tuner but I'm sure someone is working on it.

It doesn't seem the tuners have any idea what's causing it.

That and the issue where the service stabilitrack flashes on guys making more power even when the ST is shut off. Whoever figures that out is gonna get my vote for SuperTuner :) You would think Vector could do it easy based on what they say that have for OS tools, etc.

Thanks Vince. Nice to have you guys here.

[02redhawk]

It doesn't seem the tuners have any idea what's causing it.

That and the issue where the service stabilitrack flashes on guys making more power even when the ST is shut off. Whoever figures that out is gonna get my vote for SuperTuner :) You would think Vector could do it easy based on what they say that have for OS tools, etc.

Thanks Vince. Nice to have you guys here.


I'm pretty certain Vector does know the cause... :yes:

[rrmccabe]

I'm pretty certain Vector does know the cause... :yes:

Well then they need to find the fix ! :)

And Chris sent me a PM saying he was working on it. Has something to do with the flux magnetic capacitor colliding with the thermal henway driveshaft combobulator vertical axis.

[ChiTownSS]

Well then they need to find the fix ! :)

And Chris sent me a PM saying he was working on it. Has something to do with the flux magnetic capacitor colliding with the thermal henway driveshaft combobulator vertical axis.

:crazy: OK that made my head hurt.

[BLK60SS]

Hahhah, don't forget...you have to be traveling at 88mph.

[MyGoatBites]

Actually you have to be traveling 83mph to engage the flux capacitor. You have to also be running at least 93 octane and have some sort of power adder on your truck to generate the 1.21 gigawatts needs to engage the speed sensor. All this...or you could just not put a stall converter in your truck.

Personally while I find the spedo thing annoying, they always give me a slip saying how fast I was going when I get to the end of the track. That is unless you are running at Denton, then you are lucky if they were even timing you.

[BLK60SS]

1.21 gigawatts

That's jiggawatts, my friend. :crazy:;)

[rrmccabe]

That's jiggawatts, my friend. :crazy:;)

Vector sells those. On back order right now. Due in next week.

[TonyGXP]

Vince, Thanks alot for this info, should help those "DIY'ers"...

Is there anything that was "upgraded" over the 4l65 it is based off of, or are we looking at just the latest "number" change due to upgrades in the sensor/wiring design??

[DrkPhx]

And all along I thought the 4L70E was a true upgrade over the 4L65E. Looking at the specs on the GM Powertrain website confirm Vince's finding because both are rated at the same maximum power rating. Which makes sense because the 65E came in the 05 Vette and GTO with the LS2. Also, according to the website there are two assembly plants; Toledo, Ohio and Ramos Arizpe, Mexico.

[VinceATFLT]

Vince, Thanks alot for this info, should help those "DIY'ers"...

Is there anything that was "upgraded" over the 4l65 it is based off of, or are we looking at just the latest "number" change due to upgrades in the sensor/wiring design??

I saw some parts that had ID marks on them but I have not had a chance to check the hardness of these parts. I am thinking that the made the number change to ID the input changes. Vince

[TuneTimePerformance]

not very reassuring... what level have you seen the 65's get to HP wise before the grenade goes off?

[VinceATFLT]

not very reassuring... what level have you seen the 65's get to HP wise before the grenade goes off?

I was mearly stating that I had seen some ID grooves on the output shaft and the rear ring gear. Before I have proof that these parts are stronger/harder, I will not post that they are better that the 65 parts. They may very well be the same parts that simply have an ID on them to show what generation they are. As far as the grenade factor, it really depends on what the application the trans is being used in. I have seen f-body and vettes go to 700-800rwhp. Fullsize trucks (5000-6500lb trucks) go to 500-600rwhp. Weight, torque, HP, usage, and few other factors all come into play here. With the TB SS, it is a new market that I'm sure plenty of us are learning and designing as we go. I'm sure you have to agree here. Vince

[TonyGXP]

I just read the new MotorTrend and it says the "HD 4L70E" trans never skipped a beat.. I guess there using this in the new Silverado now? I wonder if it's the same as ours?

[Blacksheep1]

Hopefully FLT will get it figured out soon since I have a dead 4l70 after tonight.:x

[PEDRO]

what happened? trying to "make" urs run like normal? lol

[Blacksheep1]

Some thing like that. It decided it didn't want to shift 2-3 anymore while "playing " on the street tonight.

[PEDRO]

well u need to wuit playin with the vettes in the tbss and take the single cab out to the streets:crazy: !!

[Blacksheep1]

It was a T/A not a Vette and no one will run my silverado.

[PEDRO]

yeah id be scared of the silverado to.I keep gettin cobras that want to run me.

[DrkPhx]

I just read the new MotorTrend and it says the "HD 4L70E" trans never skipped a beat.. I guess there using this in the new Silverado now? I wonder if it's the same as ours?

Same Transmission code for both vehicles which is M70.

[TonyGXP]

Same Transmission code for both vehicles which is M70.

interesting.. so do we have a HD trans, or does MotorTrend blow it..AGAIN spreading misinformation about vehicles... Hope they know something we don't!:D