'84 C4 Barely Accelerates While In Drive
Drifting
Joined: Feb 2016
Posts: 1,384
Likes: 339
From: Simi Valley CA
I would look into getting an ATSG 700r4 rebuild service manual. Then you can trouble shoot it better. It will give you specs on line pressures and guide you towards the components that cause what ever issue you're seeing. Another thing is the valve body may be too worn. When I rebuilt my first 4L60e I put all new seals in the valve body. Got a transmission code again. I had to take the valve body apart, made a boring jig and bored out one of the valves to install an oversized valve. It cured the issue. I really don't know much about auto transmissions, but was able to find tons of info on youtube for installing transgo upgrade parts for specific issues.
Thread Starter
Intermediate
Joined: May 2022
Posts: 46
Likes: 3
Okay, so before I start chasing this problem any further and go back into the transmission again or potentially go further than the valve body, I just want to be sure pretty much everyone here unanimously agrees the problem is inside the transmission and not some sort of weird vacuum/electrical/engine issue. I know that the high line pressure should be the dead giveaway, but I just want to confirm before taking the next steps.
Melting Slicks
Joined: Feb 2003
Posts: 2,669
Likes: 809
From: Saskatoon Sask.
Okay, so before I start chasing this problem any further and go back into the transmission again or potentially go further than the valve body, I just want to be sure pretty much everyone here unanimously agrees the problem is inside the transmission and not some sort of weird vacuum/electrical/engine issue. I know that the high line pressure should be the dead giveaway, but I just want to confirm before taking the next steps.
You could dick around with this trans several times and not find the cause. My advise would be to rebuild the entire unit, either yourself or get it done. Put in a rebuilt pump and valve body if you don't know what to look for in your old one. A master kit for these units is cheap and then you have a "new" unit.
