Noise thump from rear of 99 explorer after fast breaking

There is a Noise thump from rear of 99 explorer sport after fast breaking.

70,000 miles. If you stop slow it does not happen. If you break fast then ounce you stop completely something in the back area gos a load thump. What could it be? Thank You very much for any reply :)
Reply to
MarkE
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This is probably not your same problem, but I remember once a guy came into the dealership I worked at with an explorer and a knocking noise in the rear. Turns out he had a mud clump formed on the other end of the gas cap tether up in the wheel well.

SW

70,000 miles. If you stop slow it does not happen. If you break fast then ounce you stop completely something in the back area gos a load thump. What could it be? Thank You very much for any reply :) >
Reply to
S

Drive shaft pop, Ford in the old days would put a relief valve in the front yoke to stop this but it has not been needed for years. As the drive line comes together after a panic stop the drive shaft will snap back when the vehicle comes to rest, all normal.

R> There is a Noise thump from rear of 99 explorer sport after fast breaking.

70,000 miles. If you stop slow it does not happen. If you break fast then ounce you stop completely something in the back area gos a load thump. What could it be? Thank You very much for any reply :) >
Reply to
KANSAS SPEED & MARINE

Ignoring his agents wishes,KANSAS SPEED & MARINE flung open the hotel room door and announced to the gathering crowd:

70,000 miles. If you stop slow it does not happen. If you break fast then ounce you stop completely something in the back area gos a load thump. What could it be? Thank You very much for any reply :)

...how much fuel did you have in the tank? If it's less than half full, you might of just heard the fuel sloshing forward after a hard stop. That would explain it only happening when you brake hard.

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