This morning I was hauling my boat out to the fishing hole and when it would shift into overdrive the torque converter would lockup then immediately unlock. I would accelerate and it would lockup and immediately unlock again. It did this most of the trip there then it starting locking up like it normally did. But on the way home it wouldn't lockup the whole trip. I checked my fluid and it was full but the color was a touch off. I changed the fluid about 6k ago. The truck has a e4od in it and 241k on the speedo. I believe the converter is going out but any recommendations and help would be appreciated! Thanks

 

I drove into work this morning no troubles. I don't live too far from work so the tranny probably wasn't warmed up all the way. As i think about it the same thing happened the weekend before last when i took the boat out. But it would lockup on the way home. I do have a ts performance 6 position switch i usually run it in the 4th position. If i recall it specifically tells you not to tow in the last 2 positions. When i bought the truck it had a intercooler in it and it shimmed the fpr and replaced the intercooler with one i made. By the way the boat and trailer only weight a touch over 1000lbs together. Thanks!

 

I done some research and believe it may be the manual position lever sensor. I'll check the connections and see what happens. Im gonna be pulling a trailer later tonight.

 

That's a lot of miles for one of these trannies... mine had a reman put in right before I bought it at 160k.

 

I don't believe that the tranny has not been worked on before. You can tell some one has tinkered with it.

 

im not that good with trannys, but thats what happened to mine a few years ago right before the 2rd rebuild my tc would be locked in od, then when i gave her a little fuel, she would unlock. others here with more experience will chime in.

 

Hmmmm.....mine wants to lock when giving it some fuel but when i let off it unlocks. But only does this when im towing. I read on the net someone with a similiar problem i think mine is actually slipping out of od and just back into drive. When it would try to go into overdrive there was a quite a few hundred rpm difference when it would go into overdrive and when it would slide back into drive. Thats why i'm thinking it might be the mlps. Thanks for the replys!

 

Well I have a update on my truck. I took the boat back out this morning and the trip there was the same as last time slipping in and out. But I discovered something odd on the way home. It didn't even act up once til I went to move into the left lane and hit my turn signal at highway speeds. The rpms jumped right up and it did the same when I turned the lights on just to test it out. When I would turn the lights or the turn signals off the rpms would go back to normal. Does anyone have any ideas why it would do this? It only seems to do this when I am pulling a load and the lights are on. Any help would be appreciated!

 

You have a wiring problem, most likely with the trailer lights. It could be a shorted bulb or a shorted wire. The PCM monitors the brake light circuit to unlock the torque converter. If something is wrong there the PCM thinks the brakes are on.

 

Well I have a update on my truck. I took the boat back out this morning and the trip there was the same as last time slipping in and out. But I discovered something odd on the way home. It didn't even act up once til I went to move into the left lane and hit my turn signal at highway speeds. The rpms jumped right up and it did the same when I turned the lights on just to test it out. When I would turn the lights or the turn signals off the rpms would go back to normal. Does anyone have any ideas why it would do this? It only seems to do this when I am pulling a load and the lights are on. Any help would be appreciated!

 

Thanks for the reply and sorry for the double post. I'll get out there and check out the wiring. I know it isn't in the best condition since i purchased it. But i'll give it a try! Thanks!