Hi - I have an 04 Endeavor - just bought it used. Noticed a whining/roaring noise while traveling at speeds above 30 mph. The noise usually kicks in around 30-40mph and continues consistently while accelerating. Then, when decelerating the noise goes along with the deceleration cutting out at around 25-30 mph. I have been to two different Mitsubishi dealers. The first told me that it was a normal noise (which frankly, insulted my intelligence). The second replaced the rear differential carrier assembly unit - only to find the noise still there. I took it back in and they said they lubricated the wiping surfaces on the carrier bearings. Noise is still there. I am taking it in again in the morning. While I am driving, the noise sounds like it is coming from the right front of the vehicle. I have found 3 bulletins that closely describe what I have been dealing with. One is the rear differential - which they replaced. The others have to do with the Axle Assembly and the Automatic Transmission (whistle noise from propeller shaft). I have taken it to some other auto shops - and have had a few mechanics tell me it is a bad right front carrier bearing. It is still under warranty - so I am back at the dealer. I told them what a mechanic told me about the carrier bearing being bad - and they said they didn't agree. Frustrating!!!

Can you give me any feedback? Oh - and ironically, when I took my vehicle in - there was another 04 Endeavor with the same problem. They replaced the rear differential and the vehicle was back in because the noise was still there.

Thanks.

Well, I see no one has any feedback. Though, I am amazed by all the people who posted on here that have had the same problem. Update - I took all three bulletins that I found online into my dealer. One of the bulletins they had already tried on my car - the one that replaces the rear differential. So, they tried the bulletin asking to replace the propeller shaft. The vehicle has not made the noise since I picked it up. So far so good. I will post again if the noise comes back - but I am hoping this works.

So, if you are an 04 Endeavor owner with this noise problem - tell your dealer service dept about the following bulletin. I describe the noise as a whining/roaring noise - but howling is also a good description. It kind of sounds similar to a plane coming in for a landing (just not as loud!).

TSB No: 108
NHTSA No: 10013677
TSB Date: 8/1/04
Component: Power Train: Automatic Transmission
Summary: Whistle noise from the propeller shaft.

I had that noise - started replacing things as you did, but in the end, I just chopped the car in for a new outlander :) There were a few other odd noises on mine as well, and being out of warranty.....I just decided to let it go.