shift solenoid location?

It is not good to do. lets just replace it here are the instructions and location of the shift solenoids. Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

I just rebuilt this 4t45e transmission (second to third shift solenoid failure). I replaced clutches and solenoids and checked the sprags and pistons. I then reassembled with new seals from a $270.00 rebuild kit. After installing in the car, drive acts the same as neutral. Reverse works. Manually selecting first, second, or third works as well. I tried disconnecting the linkage, and shifting using a wrench, same problem.

Good morning.

Did you air test the clutch packs after replacing the seals and clutches?

Did you go through the valve body and clean all the valves and passages?

Roy

I did go through the valve body and made sure all of the valves were free moving, and passages clear. I did not replace the Teflon seals as they looked like new. I followed the ATSG manual religiously, but could not figure out how to apply air pressure to the pistons. I was extremely careful not to roll any of the lip seals while inserting the pistons. I also validated the check ball positions against the update page. I verified the input sprag would rotate in the one direction.

Also, no codes are being thrown.

Thanks,
Dave

Okay, as far as air test, you need a test plate for clutch applications.

if there are no codes, it is mechanical issue. it looks like you will need to pull it again and look at the front clutch assembly again to find out the issue.

Roy

As far as front clutch assembly, are you referring to the forward clutch assembly or the second clutch in the driven sprocket support bracket?

If it is mechanical, why would selecting first, second or third manually work, but not drive? I am not questioning your response, but am trying to get a better understanding on how the drive selection causes a different mechanical response from the first, second or third selection. I assumed that they should all be the same at a stop or at very low speed.

Yes, the forward clutch.

When it low range you have applied a band.

Does your ATSG book give you a flow diagram for the fluid?

Roy

I was told by dealership that my shift solenoid in my transmission is sticking. so I'm trying to find out where thy are located at and how many there are so I can try fixing it myself.

I am currently reading: https://www.scribd.com/doc/227203957/4T40E-Repair-Manual
which does.

Good afternoon,

The side cover has to be removed to access the shift solenoids. There are two of them in the valve body.

This is an involved job removing the side cover to gain access. the axle will have to be removed and then the transmission will have to be dropped down on the one side to get the case cover out.

It is a five hour job in a shop with experience and the correct tools.

Roy

1. Remove the case side cover.
2. Disconnect the 1-2 shift solenoid electrical connector.
3. Remove the 1-2 shift solenoid retaining clip (314D)
4. Remove the 1-2 shift solenoid (315A).

Okay.

You will still need to pull it again and go back to the clutches.

Roy

It turns out that I assembled the input sprag backwards. Thanks for the help.

Good find. Glad you found the issue.

Roy