Well stock trans went two weeks ago so warranty company had another stock one put it (4r100). Finally got the truck today and I noticed my overdrive was flashing. I have no issues though shifts fine speedo works Rpms are normal I checked fuse 19 under the dash that's fine so I'm lost

If I turn the key on I can use the button like normal but once I drive it just flashes. It works but flashes .

 

If the light is flashing, there's a code stored. That's the best place to start.

 

Yeah I have a drive home tomorrow back to Delaware so Monday at work if it's still happening I'll have my one coworker scan it sucks you need a fancy scanner for it

 

You don't really need a "fancy" scanner, search for "torque pro" or "forscan" in this forum for some effective low cost options.

 

Well has to be fancier then the one I have lol

 

Just drove it to get food

I noticed it doesn't start to flash till I hit 15-20mph where it goes to shift to 2nd

But the code will tell just annoying that a dealership installed the trans and had to of seen this but of course they weren't there when I got it today

 

Did they replace the trans cooler and radiator? These are things overlooked when doing a transmission service, "cleaning/flushing" never works, replacement is necessary.

 

No they did not I plan to do a 6.0 cooler soon. They did have to replace two cooler lines due to them "blowing" after the new trans was installed. They said due to rust idk I didn't see the old lines and live out of state from where it was soo only so much i could do