Rapid THUD when taking off
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Elder User
Joined: Mar 2010
Posts: 756
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From: Phoenix Az
Rapid THUD when taking off
What causes a rapid thud when taking off. It kind of feels like slack in the driveline. Some times there's two or three. I came across a thread here that described that as a slipping tranny, especially in only 1 gear. That's my case, in first gear. There's also a bit of a shudder when taking off, also. I was hoping it might be in the torque converter, as I'm planning on upgrading it in the future, anyway.
If that were the case, what does it mean in real terms.
Waye
If that were the case, what does it mean in real terms.
Waye
Fleet Owner
Joined: Mar 2007
Posts: 28,312
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From: BLT, MN
I don't know all the correct terminology but it could be the driveshaft where it slides into the rear of the transmission. That may need some grease. Make sure you chock the wheels before pulling the driveshaft.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 28
From: Mesa AZ
Seems like every 40k miles my slip joint starts sticking. I end up having to re-grease it and everything is good for a while more. Sometimes if I tow a heavy load, it loosens up or something because the 'thud' goes away. Eventually it comes back though.
Could be your slip joint. Does it happen when you first start moving after each dead stop?
Could be your slip joint. Does it happen when you first start moving after each dead stop?
Senior User
Joined: Mar 2010
Posts: 154
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From: Topeka,ks
Not shure what year your truck is ive got a 2001 f350 and mine started somethang like you are explaning. And found out that the bolts to the full float axle were finger tight. Dont no how it happen but it was just the driver rear axle that was doing it tighen it up and retorqe to specications and good as new . Good luck
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From: Phoenix Az
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Cargo Master
Joined: Jan 2002
Posts: 2,079
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From: LA and CO
That's funny. Sounds like me yesterday. First drive after installing new tie rods and springs and I hear this weird rumbling... It was the old springs rolling around in the back of the truck!
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Elder User
Joined: Mar 2010
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From: Phoenix Az
I tried to order the XG-8 PTFE lubricant at my local ford dealership. He looked it up and sure enough that's what it's used for. Motorcraft doesn't stock it and one other source he uses doesn't either. What's a reasonable alternative. Give me specifec brands if you can please and where there sold.
Thanks,
Wayne
Thanks,
Wayne
of American machinists
Joined: Oct 2004
Posts: 1,014
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From: NORTH IDAHO
I used Schaeffer's on mine.
Schaeffer Mfg. | Moly EP Multi Purpose Grease
I also installed two zerk fittings 180 degrees apart on the short section of the slip yolk. No more pulling the drive shaft to grease it, a few pumps every 6 months or so keeps it pretty quiet.
Schaeffer Mfg. | Moly EP Multi Purpose Grease
I also installed two zerk fittings 180 degrees apart on the short section of the slip yolk. No more pulling the drive shaft to grease it, a few pumps every 6 months or so keeps it pretty quiet.