98 f150 4x4 with the 4r75w 290000km and every now and then my O/D light starts flashing, seems like its happening after you have been driving for an hour or more, and the only way it will stop is to shut the engine off, but it will come back on after a while...anyone ever had this happen, or have an idea of what could be the problem. fluild doesn't seem burnt and is pink and clean..still shifts fine threw all the gears so i don't have a clue what the problem is......

 

The pre-2004 AODE-based transmission was the 4R70W (not 75).

Is the fluid low or high? (Either is a problem.) Make sure you check with the engine on and in Park, on a flat, level surface.

 

sorry my bad.yeah its a 4r70w..fluid was good when i checked it..could this be a heat thing???

 

This could absolutely be a heat thing. That was my first thought actually.

If the OD light was flashing that means it stored a fault code. That code is the key. To get it read you are going to need to find a shop that has a scanner capable of reading manufacturer specific transmission codes. That won't happen at Autozone or most of the places that will read codes for free to get you to buy parts. This takes a real scanner to get done and they don't have one of those.

Good luck with it.
Darrin

 

Can the aftermarket programmers (Superchips, Edge, etc) read transmission codes?

I only received a blinking OD light once, and that was right after replacing my transmission valve body. One of the shift pressure pistons had gotten bound up with the retaining clip and I had to replace it. I seriously doubt your problem is the same.

Is it still flashing? Does it always flash, or only after you've been driving, especially towing?

 

only after driving for a while it will come on

 

Mine flashed and I replaced the gear shifter due to worn wires going to the switch. Fixed my problem.

 

Yep, sounds to me like a heat problem. Until anyone else chimes in, I'll give my $0.02. You said the fluid was at the correct level already. If your truck has a tranny cooler you might want to check the lines and make sure they're not clogged and everything's flowing properly.

Is this issue happening during day-to-day driving (not towing, off-road, constant low-speed or stop-and-go in hot weather, etc)? The tranny shouldn't need auxiliary cooling except during heavy work, such as these activities. If you're having heat problems from plain vanilla driving there's probably an internal transmission problem that's causing the extra heat.

If you're doing a lot of heavy towing or off-roading it might be a good idea to add an aftermarket tranny cooler with an e-fan to help it keep cool.

Again, this is all my $0.02; I have some basic knowledge, but trannies aren't an area where I have a lot of experience. Hopefully someone more knowledgeable will also chime in for ya'. You might try searching this forum, too, if you haven't done so already. Maybe try an advanced search for "overheating" with only the Transmission section chosen.

Or, you could always go to the dealer as Darrin suggested. But then it'll be much more than $0.02 worth of help! Of course, sometimes it's necessary.

Good luck!

 

is it easy to install a temp gauge in the tranny

 

I would go to a dealer and have the code read.

 

I imagine you could install it in the side of the pan, but it's kind of an exposed area and may easily become damaged by road debris. You could also install a fitting in line with (before) the tranny cooler, assuming you have one. You could also install one after the cooler to see what it's doing for you.

No matter what, though, these are all going to cost money. Sensor + gauge + pod mount... Might be easier just to get the code read by the dealer and know exactly what the problem is for about $80. And that would be credited toward the repair if you have them do it (highly recommended if it's internal).

If the repair estimate is really expensive you might also want to get a second opinion. I hate paying lots of money and not having the problem fixed, and mechanics (including dealers) have no guarantees.

 

knock on wood but i haven't taken my truck a dealer yet..i take pride in doing this my self...with the help of some mechanic friends and online friends lol..might just call a tranny place and see what they say

 

change the fluid otu with the correct fluid and see what happens

 

the correct fluid is in there

 

Without getting the codes read, all anyone here is doing is making wild *** guesses!