I posted this in the trans and drive train section. I was hopping someone here might be able to drop somthin on my problem.

03 Navigator has about 110k on it. I just bought it and it had small leaks from where the trans cooler and the aux cooler met. I didnt drive it like that but who know how long it had been driveing that way. I repaired that small problem. Drove it around for a few days felt good and strong. Hit 60 and the Over drive light started flashing. hit the O/D button on the counsel rpms kicked up a little bit, hit the button again they wen down. (seems to be the OD is working properly).

Next day cruising 60 the check engine and od light turn on. I got the P1744 code (torque conv. clutch sys per.) Checked the fluid looks good.
Just got done reading tons of 4R100 reveiws. The spectruim seems vast, is it worth flushing and putting in the filter and new valve body or am i sol on the easy fix?
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I would first try a new TCC solenoid, along with a new filter and fluid. It's a $150 gamble, but it could save you a $2000 rebuild.