I searched, and didn't find exactly the answers i was looking for.
I have a 1997 Olds LSS, 3.8L N/A.
The engine/car has 205,000mi
the trans was replaced with a 68,000mi unit from the same year/proper fit
i've driven it about 30,000mi since the transmission swap
Recently, I got a CEL - DTC P1870 Transmission Component Slipping 3.8L
I had autozone print the explanation, it said - towing/excess load, low trans fluid, OR internal trans fault.
I checked my fluid, and it was down 1qt. I topped it off, reset the code, and it was fine for about 3 weeks.
The other night, while out for a ride, the light came back on.
This time, I properly checked the trans fluid - and it was right on the money.
I have noticed an occasional "slip" in 4th gear overdrive - the car will slip about 3-400RPM'*, not violently - just kind of, a lazy variation - up down up down up down up down - until i either tap the brakes to unlock the Tq convertor, or give it more gas to downshift.
However, My tranny fluid was not flushed completely when it was replaced. They topped it off, road tested it once, brought it back in on the lifht - dropped the pan, changed the filter and gasket, and topped it off again. As we all know, this leaves about 2/3rds of the old, crappy, tranny fluid trapped in the cooler lines, in the tq convertor, etc.
so, my fluid is brownish red - and I've scheduled a transmission flush at the dealership for tomorrow (wed.) they've got the machine that draws old fluid out of the trans cooler line, and re-fills with fresh, while the car is running and the trans does all the work. They will also be replacing the transmission filter, and gasket.
SO, will fresh fluid - and fresh filter - help this nonsense, or is my code going to come back on in another 3 weeks?
the thing'* pretty tight overall, i want to get to the bottom of this