a dull thump when accelerating

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Jan 19, 2004 | 08:54 PM

#16

351coupe

Elder User

Joined: Apr 2002

Posts: 589

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My 95 F-350 does the same thing.I havent looked into it yet but Ive heard that the transfer-case mount is a common cause.The slip-yoke needing grease is another common one-as someone already mentioned.

Jan 19, 2004 | 09:06 PM

#17

paulfix

Senior User

Joined: May 2003

Posts: 203

Likes: 1

This may sound stupid, but I had a thump rattle sound a while back on take off. After checking almost everything, changing mounts and bushings, it turned out to be oil bottles and a can of WD40 in a draw under the passenger seat. I laughed pretty hard when I figured it out

Jan 19, 2004 | 09:23 PM

#18

Blue89F150

Junior User

Joined: Nov 2003

Posts: 51

Likes: 0

From: Indy

Well, I know this is not F0rd related, but my firebird did it and it was the tranny mount it would make like a hard thump you could feel in the floor board.. The tranny moutn was shot. My trucks starting to do it to..lol Like everybody els I might check the tranny mount. My 2 cents.

Adam Throop

Jan 20, 2004 | 03:12 PM

#19

sgthawkusmc

Laughing Gas

Joined: Oct 2003

Posts: 1,082

Likes: 93

From: VA/NH

I concur with Blue89F150. Sounds like a tranny mount. You have to push up hard on them sometimes to check. It might feel ok, but there is a lot of upwards pressure on them when step on the gas.... Put a long screw driver or lug nut wrench between the tranny and the crossmember if you can. Look at the rubber and see if it separates.