Originally Posted by ericj
I am hoping that someone else has had this issue, my wife's 2005 explorer is making a thumping noise, almost like when you hit a bump or something on the road. It only happens when the truck slows down between 65-35mph and it stops when you accelerate. It isn't constant but once it happens it basically continues until the next time you drive it after it sit, has anyone had something similar?
The AWD or 2wd tire diameter won't matter between axles as long as all tires are the same size. plus or minus 1" diameter is acceptable. Full time 4wd takes that into account. Running on pavement in 4HI will bind the axles and can cause issues. Only quattro Audi and premium higher end AWD systems take tire diameter into account when it comes to braking and power transfer.
If you don't feel feedback through the steering wheel chances are good the problem is at the back. It could be a number of things, warped rotors, stuck caliper pistons that are slow to retract after you press the brake, the pads drag on the rotors. Irregularly worn brake pads can also be an issue.
To try to narrow it down, set the vehicle on axle stands, place the transfer case in neutral so you can turn each wheel independently. The axle gears and driveshafts will also move to better pinpoint the noise. I also wouldn't rule out early stages of a bad wheel bearing.
I have a Durango R/T AWD and that's what I would try to do to pinpoint the noise.
Other things to check is the pumpkin and transfer case gear oil/trans fluid levels.
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