If you will check my posting history, you will see where the input shaft stripped out on my 98 LeSabre transaxle. Since the trans was at the life of the clutches, I was looking at rebuild or replacement. I decided to go with a used replacement since I found a used 98 tranny with only 29K miles; I did purchase a six month warranty on the trans which is now gone. I did replace all the solenoids in the trans with new ACDelco including the pressure plate. The speed sensor was not replaced and a leading trans parts place said they did not have them and that they rarely failed. The trans shifts well except for a harsher 2-3 shift. I plan on putting in a TransGo shift kit. The replacement trans was clean; nothing in the pan, and it came with the torque converter which I used instead of the old one.

I have developed a intermittent PO742; TCC system stuck on condition. The condition stays during travel; once it sets, it stays until I stop the vehicle and it sits. The condition then clears and the car shifts fine. The car doesn't stall but when pulling off it will shudder and I have to creep until I get some speed. I am guessing that the valve in the valve body is sticking. I foolishly did not check the valves in the valve body before installing the tranny back in the car. I used Dexron VI fluid in the trans with a new filter of course.

So, what do you guys think? I was wondering if I could use something like Seafoam in the trans and drive it. Then when I put in the TransGo shift kit I will put in some fresh Dexron VI fluid and a new filter.

I don't believe there is a valve, it'* a solenoid......there are several TSB'* on this code....

OK, maybe it is just a solenoid and no valve, a new one shouldn't be sticking and is why I went with the cost of the ACDelco instead of the cheap China no name. OK, I have already looked around the net so that is why I am here; to get some feedback from the forum. I did have someone to send me a notice but it was for a different car and these tranny changed year to year until they were replaced. So if you have a TSB that I can read for the 98, then by all means give me a link to it as I have not found it on my searches.

Back to the original question. Since this was a used tranny that had sat for awhile, what do you guys think about adding something like seafoam to the fluid to see if it would clean away anything that could possibly be making the solenoid stick? Or do you suggest no and just keep driving it as is? Real PITA to remove the side cover; you can't without basically dropping the tranny. Saw a video on YouTube where a guy shows how to "twist the cradle down or up"; he even shows rebuilding the 4T65E in car.

I stand corrected, there is a valve, I looked too quickly......And it'* possible there could be some sediment in there, causing it to stick and not release the apply fluid......or a burr on the valve....

So, one place to start is the valve body, especially if you have already replaced all the solenoids in the valve body already.......even check the harness for a short.......unfortunately, that is not easy to get to, especially if you don't have access to a lift.....

One other thing is, when a tranny is launched, and a replacement is installed, the transmission lines and the cooler in the radiator should be flushed.....not sure if you did that....

Do you have the VIN that the 29,000-mile transaxle came from? There were some valve body issues back in those days and perhaps this one didn't get taken in for it since it was so new and warranty time-expired before it mile-expired. With a VIN you could find out what had been done to the donor car including transaxle stuff.