42RLE rebuild, no fourth gear

It is because the overdrive is applied with the underdrive in third and that opposing force will lock it up and cause the 1:1 ratio. However, when you remove that opposing force the overdrive is slipping.

They should be getting some codes. If you can get those, that will help confirm this before they pull the unit back out. At least at that point we will know exactly what to go after if they have to send it back.

Take a look at the attachments below and look at the third gear vs fourth gear and you will see where in 3rd they are applying UD and OD that are basically opposed from each other.

Let us know what the codes are and we will know for sure what is happening.

That is never fun to redo things but I think he is correct. Most likely a cut seal so if he doesn't see anything, I would just reseal it again just to make sure.

Thanks for your support and continuing to come back. I always like answering your questions because you provide the info needed to assist.

You don't just tell us that "it doesn't shift right" and then ask what to do. :)

That sounds familiar. Thanks for the update. Glad you are back on it. Let us know how it turns out.

You stay safe as well.

If the unit air checks okay then you don't have a cut seal so then that means it would be the valve body.

The only thing that worries me is you are only looking at the unit and not looking at the entire vehicle. Sometimes there is more to the story that we are not getting when you only have the unit without the vehicle. Did they say there were any codes?

Got it. That can be deceiving on the air checks because the clutch pack can have clearance issues but still pass the air check. Thanks for the update because I am sure that will help others, including me because I clearly didn't think about checking the clearance. Now that we know what it is, it makes perfect sense.

Talk to you next time.