Strange thump/lurch accelerating from a stop
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Joined: Feb 2011
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Strange thump/lurch accelerating from a stop
I have a '95 4x4 f150, 302, automatic (not sure which tranny, but I know it isn't an E40D). The truck is lifted a couple of inches, has manual locking hubs. Whenever I take off from a complete stop, I can feel and hear a thump that seems to be coming from the rear of the truck. There is also a bit of a lurch associated with the noise as the truck takes off.
I haven't noticed any additional problems once the truck is moving. It seems to have gotten worse. I recently had all the bearings and one axle shaft in the rear end replaced after a leak developed. I was told the other axle shaft had been replaced before.
The problem existed before the repairs, but not frequently enough that I felt compelled to look into it. Any ideas what the problem might be?
I haven't noticed any additional problems once the truck is moving. It seems to have gotten worse. I recently had all the bearings and one axle shaft in the rear end replaced after a leak developed. I was told the other axle shaft had been replaced before.
The problem existed before the repairs, but not frequently enough that I felt compelled to look into it. Any ideas what the problem might be?
Elder User
Joined: Nov 2005
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Try dropping the drive shaft, and smearing a good load of grease on the splines of the slip joint. Reassemble and test drive. If the cluck is gone, a worn slip joint is the problem. The grease doesn't fix the problem, but it lets the joint work without getting stuck and causing the lurch/ clunk on take off. The grease will not last a long time, but might buy you some time to figure out what to do next. I drilled and tapped for a grease zert and shoot the joint when it starts clunking. I don't drive my truck a lot.
Good Luck Frank
Good Luck Frank
Senior User
Joined: Dec 2010
Posts: 266
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From: Southern California
I have the same issue, and i've been told the same thing about the slip yoke. I am going to try that soon.
Also want to add that I had a truck before and had something that seemed a lot like this and when i told it to a shop after not being able to track down the issue myself the guy found that my torque converter came loose and the 6 or so bolts had ovaled the holes like 3/4 an inch. Ive heard this is pretty rare but if you run out of possibilities you may want to look into that.
Good luck
-Jesse
Also want to add that I had a truck before and had something that seemed a lot like this and when i told it to a shop after not being able to track down the issue myself the guy found that my torque converter came loose and the 6 or so bolts had ovaled the holes like 3/4 an inch. Ive heard this is pretty rare but if you run out of possibilities you may want to look into that.
Good luck
-Jesse
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