Thumping sound when coasting, accelerate or brake and it stops.
I suspect there will be something loose in a CV joint, under load it will be held in place but when it is not under load it flaps around causing the thumping. You should be able to identify which side of the vehicle it is coming from then a mechanic should see it ASAP because if it lets go completely it will not only be dangerous and stop the vehicle from going anywhere it will be very expensive to fix the colateral damage.
SOURCE: Will not start
if the lights work it is not the battery. The battery controls your lights. It could be your starter. try tapping the litte round part of it with a crow bar or something, and if the POV wants to start or attempt you know thats the problem.
you can also check all your battery conections and insure that there isnt any corrision on them
SOURCE: Rear differential / axle noise and vibration.
A drive shaft that has lost a balancing weight will vibrate between 40 and 50 mph. If not corrected this could damage the input shaft bearing and seal on the differential causing oil leakage. Differentials are fairly indestructible but if run without oil will fail.
As for the front end you should never run the 4wd on dry pavement. The front differential is a posi traction unit that will turn both wheels at the same rate unlike the rear diff that will allow the inner wheel to turn slower than the outer on turns.
SOURCE: Engine taps when accelerating, let off gas and it
HOPE IT'S NOT PISTON SLAP, IF LACK OF MAINTANENCE WAS THE CASE MAY BE INTERNAL DAMAGE OR VALVETRAIN DAMAGE. IF IT RUNS ROUGH MAYBE SOMETHING ON ROTATING ASSY DAMAGED.
SOURCE: 2005 ford escape 3.0l AWD XLT - DRIVESHAFT CARRIER
if there is some one in your area that balances driveshafts they can change just the bearing for you
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