Thump - not sure what it is

[taylordm@att.net]

I have a thump in my '98 Explorer 4x4 Sport. If I accelerate moderately I don't get the noise, if I aggresively accelerate the car I get a continuous thump that goes faster with the increase in speed. I have not continued to push the accelerator long enough to see when it stops. It doesn't matter if it is from a stand still or I am going 60 miles an hour, if I step on the accelerator the thump starts. Let off the accelerator it stops.

Another clue is when I put it in 4 wheel drive the thump is there no matter how much I push on the accelerator. No thump when the car is coasting.

Does this sound like a transmission problem?

Dave

 

[urbanistic]

Define that thump a little more... does it repeat? From what area is the thump coming from?

 

[taylordm@att.net]

It does repeat

It sounds like it is coming from the front of the car, but can't tell for sure.
It is a continuous and steady noise that speeds up with the increase in speed of the car, it is almost like a slipping noise but the car continues to shift.

 

[scucci]

It is your rear driveshaft slip yoke. TSB 04-23-7 see pdf. The tsb indicates it is for rangers, but it is also for explorers. The kit is $28.00 at a stealership or $20.00 online.

Scucci