I havea 1992 ford 7.3 diesel. I just nowhad to repace the radiator and switched it with a manual one. I put a transmission cooler on it to make up for the rad not having one. Anyway since I have driven it today It goes into gear and drives good until it goes ito either 2nd or 3rd. Then it does a hard shift and acts like it not going to go into gear at first. Then it does and it wont switch to over drive it stays in 3rd. I have never had a problem switching the cooler like that before. I was thinking a sensor may hve went out or even the overdrive button, cause it doesnt do anything pushing it either way. Any help would be appreciated.

Thanks
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is the od light on the switch flashing if so u have a internal tranny issue -

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it doesnt act like its internal, it acts like a slynoid went out. Does any think that could be it? I have had transmission act funny before they go out befor, but never like this. I had a chevy that had to be babied untill you got up to 60 mph and it was sylnoid. -

I would double check the fluid level. -

Jet A Fuel's Sig:

1999 Dodge 3500 5.9 Cummins
5 spd manual 22K Fifth Wheel
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Cool air Filter
Autometer Gauges
Edge EZ
235,000 Miles

I did the fuel level is ok -

was it a new trans cooler could it have had debris in it? -

Yes it was brand new out of the box. and no debri was in it. -

these transmissions need two or three more quarts of fluid than what the dipstick says. there is actually an update they perform on the dipstick where they grind a new mark about a quarter in above the full line. they can run dry easily on grades(boat ramps)

is the OD light blinking on the shifter? could be a solenoid pack as they do lots of different things when they go out. do not buy a remanufactured one as they are likely not any better than what you had before. -