I've read on other forums its the OD "E" clip. Its about a 5 dollar piece but you need to drop the entire tranny. I have the FX4 04 and have the SAME excact problem!!!
I concur, it is most likely that the overdrive servo retaining clip has broken and parts get lodged in places in the valve body where they shouldn't be or the servo itself is bad.I've read on other forums its the OD "E" clip. Its about a 5 dollar piece but you need to drop the entire tranny. I have the FX4 04 and have the SAME excact problem!!!