I have a 1998 ford windstar gl with 153000miles on it. Sometimes it drives fine for a while but then when its warm up it will shift down into second, it doesn't leak tranny fluid or smoke or make any funny noises, it shifts down smoothly but not when it should!!...or sometimes it won't want to shift into 3rd at all, but thats usually if ive started the car to let it warm up, so it will just shift from first to second and stay there.....what could this be?? thanks!

SOURCE: 1996 TBird 4.6 auto/overdrive trans problem

Your transmission fluid contain water,thats why the colour of the fluid changed to pink.And of such the clutch is slipping causing the engine to reve up before shifting - Check transmission cooler.

SOURCE: 1995 ford explorer transmission problems

your check engine light mustbe on could be tps sensor

SOURCE: 1998 Windstar Transmission doesn't shift into gear

common problem for ford. and in these vans. Same thing to the 98 I had. I am a mechanic and couldn't figure it out. Thought pin fell out but linkage moved. Brought in to tranny shop and they ended up getting used on for $800

SOURCE: Just had both o2 sensors

O2 Sensors --- not related to shifting

New transmissions --- are only new once
When installed on the assy line

Has to be rebuilt if necessary

PO 147 ---O2 Sensor Heater (Bank 1 Sensor 3) don't have one of those
PO714 -- Trans Temp Sensor -heat for the slipping
PO 471 --- Exhaust Pressure Sensor -don't have that either

Need a new guy
Not very professional were they