You’re showing a picture of a 700R4 valve body and oil flow charts for a 4L60E. I’m confused.

 

That's all I could find with regard to what causes the 2-4 solenoid to engage 4th.

 

That's all I could find with regard to what causes the 2-4 solenoid to engage 4th

 

What I meant was, is it a 700 or 4L60E.

 

Hmmmm did you notice the post header/subject line?????

 

700 doesn’t have a 2-4 solenoid,and I did notice the subject line!

 

I'm afraid you can't help me because if you think a 700R4 doesn't have a 2-4 solenoid, you know nothing about the subject. In addition I know that you have not looked at the links that were part of my post also so why don't you just bow out of the discussion. You are wasting my time.

 

Great idea

 

I figure you already did this but I'm going to throw it out there because of what you said about the shift valve. I think you have some crud in the valve body and here and there a speck works loose and causes you some trouble. I would pull the VB and give it one heck of a soak and cleaning along with making sure that every valve in it slides freely. I would also run a fine file over the case just to make sure you don't have a edge that's causing a leak in the VB to case sealing.

 

Thanks, Chasracer, I suppose ultimately that's what I will do I was just hoping somebody could say specifically what to look for or what circuit or specific valve would be most suspect.

 

Sorry I guess I assumed you would definitely concentrate on the 3-4 up-shift valve once the VB was out for cleaning.

A74741-1

Whatever It Takes Transmission Parts

www.wittrans.com

They have a replacement 3-4 valve but it's not cheap - $117 and shipping. This appears to be the Trans-Go part that allows full throttle 3/4 shift. There is a note on the Trans-Go site that a minimum of 175 psi is required. Not sure if you have put a gauge on the trans and checked to see what pressures you are getting right now - it would be a good check before you pull it apart.

I am not sure if the valve is available from GM Parts or not.

 

Thanks again, Chasracer.. after going back and looking at my own documentation on my website, chapter one, I just noticed that the transgo 2-3 kit that I put in indicated that the 3-4 shift valve is to be left as it is. I'm pretty sure I never even removed it from the valve body when I rebuilt the transmission the first time nor the second time. I don't remember which direction is toward the rear of the car on the diagram of above. As I recall you can pull the valves that face toward the rear of the car without taking the valve body off the transmission. But not any that might face the front of the transmission. But of course if there's junk in it I guess I'll be pulling the valve body no matter what.

By the way nobody has answered with regard to what's going on with Dana at probuilt transmissions. Does anybody know him and whether he is alright or not?

 

Forgot to mention on the second rebuild I had 270 psi with full pull on the TC at 1500 rpm

 

700r4 does not have a 2-4 solenoid. I am thinking you are talking about the servo in the side of the case for the band? There is a 2-4 servo for the band.

 

WHAT???? OHHHH DEAR ME ....

 

Actually, neither trans has a 2-4 "solenoid".
The 4L60E diagram show the 1-2, 2-3, and 3-2 solenoids.
But since you said you bought a Sonnax, I'm assuming you are talking about the 2-4 "servo".

You need diagrams specifically for the 700R4.

EDIT: My advice would be to take your original cooler out of the system, since you put a new one in, but haven't eliminated the old one as a possible flow issue.
I'm not saying it would cause your issue, but you may as well eliminate it during troubleshooting.
Also, put a temp gauge on your trans.
My 4L60E controller has a temp gauge, and it's been invaluable.
I also have a quick-response (mechanical) pressure gauge in my center console.
I also put a magnetic filter on the return line, so that no particles from the cooling system can get to the trans.
END EDIT

One thing I can tell you is that, generally speaking, shifting doesn't just involve providing pressure to a certain hyd. circuit, it also involves pressure differential.
So a leak in one gear's hyd. circuit could keep it from shifting into another gear, because the pressure differential isn't right.
That's about all the detail I'm qualified to go into, but it's food for thought.

Your "270psi at 1500rpm" isn't necessarily a good thing... more isn't better, proper pressure at the proper throttle setting is a good thing.
At 1500 rpm I wouldn't expect more than about 100psi (as a guess), since your throttle is barely open.
That full 270 shouldn't be there until you're at a high throttle setting, regardless of RPM.
Are you the guy with the TCI valve body that's full pressure all the time?

Look at the Sonnax site's articles, and see if you find anything there...

Sonnax Tech Resources - Articles, Videos & More

Discover hundreds of free articles, videos, guides and more to help you find the best solutions to transmission, torque converter and driveline issues.

www.sonnax.com

 

Thanks, Surf...well ok, I'm old, and I like my wine...servo and solenoid both start with an "S"...haha..

As I understand the fluid going to the cooler only serves the bushings and perhaps somewhere else but does not serve any of the valve body shifting pressures.

Stock valve body with Transgo shift kit

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VIDEO ! 11/18/2017 - - Testing pressures with TV cable pulled all the way out.

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Yeah, I didn't know what you meant by "with a full pull on the TC", so didn't pay attention to it.
And no, I didn't waste my time with Chapter 1, or 2, etc.
Just offering some general tips...

 

Not related, but how did you manage to edit the title of your post? I've never seen that option...

Russ

 

Well, I don't know what to tell you, I just clicked on "edit".....and edited!?!?!!

 

Thanks. I'm either on, or have been on, maybe 2 dozen forums and have knowingly tried editing the title on some boards to no avail. So I've since ASSumed "edit" only applied to the body. Possibly these Xenforo-based boards are wired differently... Anyway, doesn't the edit button disappear after 15 minutes?

Russ

 

Once more, does anybody know Dana in Calimesa, California, and what may be going on with him?? He's always answered his phone and returned emails before but after two emails and 3 or 4 phone calls, no response....
.