2003 Ford Expedition 4x4:
Back in March I had brought my Expy (46,000k miles) into the dealer to have the rear differential replaced for a whining that happens from bearing misalignment. They also had to replace what i believe is the clutch pack. I also brought it in about a month later for the tranny clunking into 2nd on decelleration at 20mph. The dealer told me that the computer didnt throw any codes and couldnt find anything. I was told by some Expy owners that its a characteristic.
My recent problem is that now I have a groan on decelleration at about 30mph to a complete stop. Also sometimes groans on an upshift at about 40mph at accelleration when the RPMs drop to 1000. I thought it might have been the self adjusting brakes but when i decellerate and hear it, i let up on the brake and it still makes the groan. Also thought it might be the tranny but when i hear the groan on decelleration, if i put it in neutral, it makes no difference and still hear the groan. Also thought maybe was something like the A/C pump but happens when its off too. The groan is a movement thing so it cant be engine. Thought it could be the bearings or something in the wheels but once again only happens at 30mph decelleration and sometimes as it up shifts at 40mph and the RPMs drop around 1000. Hard to recreat the groan all the time as it doesnt happen all the time, but when it starts, it usually does it at every stop.
Could this possibly be the clutch pack or a tranny issue?? The tranny does NOT slip or shift odd. I have no problems with the tranny so i doubt it would throw a code. Its going to be difficult to explain to the dealer if i cant recreate the groan all the time and the tranny wont throw any codes as they said it didnt before with the clunk into 2nd. Would like to have some kind idea before I bring it in and they all say . . . "here he comes again".
Thank you.
Andie

Optional Information:
2003 Ford Expedition 5.4L

Already Tried:
nothing yet. Just listen in depth to when it happens