I had a slight issue today. It happened when going up a big hill, I turned off the overdrive. As soon as I crest over the hill I turned it back on but as soon as it got over 40, the OD didnt kick in (kept turning on and off the OD switch) but kicked in at over 50. I headed back home. Same symptom but as I was half way home I was going about 45 and felt it finally went back into OD. Havent had the problem since but I did turn off the OD as I went up the same hill. It never happened before. Is this a warning sign my trans is going to go?

Thanks

 

Pull the codes and see what if anything the computer says about it, from what you describe it should have a code stored. The KOEO test may answer the question itself.

Could be something as simple as just a bad connection to the O/D shift solenoid or the O/D solenoid itself having a problem. Neither of which is a big problem, or a difficult problem to correct if that's all it is.

So no, I wouldn't hit the panic button.......................yet.

 

No codes. How many solenoids does it have?

Thanks for replying!

 

Several all mounted in a "Solenoid pack", you can't just replace one you replace the pack. Done with the pan off, the tranny stays in place.

First you need to find the problem, if it was a shift solenoid problem it should throw a code. The fact you didn't get on is odd, may be a valuing issue and not the solenoid. A valve sticking in the valve body.
I'm on vacation and don't have my E4OD service manual with me to look it up.

Have you changed all the fluid and filter? Do you have any idea how old the fluid is, how many miles its been in there?

The fluid can be drained completely, tranny and TC.

Remove the rubber plug at the bottom of the bellhousing. Rotate the motor until you see the little plug in the outer surface of the torque converter, remove it to drain it. Remove the pan and replace the filter. Make sure the redish rubber filter seal comes out with the filter, (tend to say in the hole when the filter is pulled off).

Put in 5 or 6 quarts of fluid and then start the motor, adding 2 more then pull the shifter down into low then up through all the gears holding your foot on the brake. Keep doing this until full, takes 16 to just over 17 quarts from empty with a stock pan.

Myself I put in a jug of Lucas in my trannys, helps with a few known tranny issues.

I'd start with that and see what happens.

 

Well, the truck has 70k and I dont think the owner has changed it since. Thanks for the step by step for DIY. But I am going to setup an appointment at a well known local tranny shop. I own a business. I prefer doing maintenance myself but sometimes I just don't have the time. Once I get the fluid changed, I'll keep everybody posted. Thanks for your help fellas.

 

Update. I got a call today and since my truck was use for plowing, the tranny days are numbered. When he dropped the pan, he saw a fair amount of metal shavings on the magnet. He doesnt know how long it will last Or neither do I. As far as the OD, he didnt find a problem. I am getting a trans flush as the moment.