thumping in rear
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Joined: Jul 2003
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thumping in rear
Quite a while ago I posted about my F250 super duty 4WD diesel dually truck making a loud "thumping" noise in the rear. There were several suggestions, gas tank mounts, greasing rear axle shaft. Someone was kind enough to post a site that gave step by step procedure for greasing the rear. I am still hearing the noise, it's louder than ever. Not berings, not u-joints, not mounts, any ideas? Also if that person who posted that site on greasing rear (boot removal,etc.) would post it again that would be helpful. Thanks! Randi
Senior User
Joined: May 2002
Posts: 290
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From: Birmingham, Al U.S.A.
When does it make the "thumping sound"? If it does it when you launch off a standing stop, once, then doesn't do it until you stop again it's the slip joint on the drive shaft. If it is thumping all the time it is something else.
Senior User
Joined: May 2002
Posts: 290
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From: Birmingham, Al U.S.A.
Look in the FAQ section of this forum
"Q: Why does my truck clunk when taking off from a stop?
A: Common problem usually lies with the slip-yoke on the rear driveshaft. Usually removing the driveshaft and lubing the slip yoke can relieve that problem. See this site for an excellent how to. http://www.eurekaboy.com/f250/slipjoint.htm"
If you need any help e-mail me. I have done mine it worked for me.
"Q: Why does my truck clunk when taking off from a stop?
A: Common problem usually lies with the slip-yoke on the rear driveshaft. Usually removing the driveshaft and lubing the slip yoke can relieve that problem. See this site for an excellent how to. http://www.eurekaboy.com/f250/slipjoint.htm"
If you need any help e-mail me. I have done mine it worked for me.
Fleet Mechanic
Joined: Dec 2002
Posts: 1,664
Likes: 188
My truck is in the shop Mon. for a dull type of clunk, thump, when taking off from a dead stop somethimes, and they had to order shims. I didn't talk to the mechanic, and one service manager says the shims are for rear axle springs, the other manager I talked with said it was for the rear end. But Mon. I'll know when the mechanic prints out the service job in detail.
I did check the bulletins for the truck and they had shim kits for both the rear springs, and drive shaft center velocity joint. So maybe that's where they're confused.
I'll post when I get some answers Mon. after the fact.
Capt.
I did check the bulletins for the truck and they had shim kits for both the rear springs, and drive shaft center velocity joint. So maybe that's where they're confused.
I'll post when I get some answers Mon. after the fact.
Capt.
Senior User
Joined: May 2002
Posts: 290
Likes: 0
From: Birmingham, Al U.S.A.
Capt, the static set up (truck no load) puts the two piece drive shaft at an angle in the middle. Loading the truck will sometimes take some of the angle out and some of the thump also. Shimming the center driveshaft bearing down will take some of the angle out and that will help it unloaded. However with the center bearing shims in when you load it you increase the angle the other way and the thump can return. It doesn't seem like they know what they are doing. Why don't you sell them on the idea of simply greasing the splines first. It is a 30 minute item on a rack. It worked on my truck, it has worked on others. No sense in disturbing spring hangers, shimming the center bearing if you don't have to.
Good luck.
Good luck.
Fleet Mechanic
Joined: Dec 2002
Posts: 1,664
Likes: 188
Originally posted by capt caper
My truck is in the shop Mon. for a dull type of clunk, thump, when taking off from a dead stop somethimes, and they had to order shims. I didn't talk to the mechanic, and one service manager says the shims are for rear axle springs, the other manager I talked with said it was for the rear end. But Mon. I'll know when the mechanic prints out the service job in detail.
I did check the bulletins for the truck and they had shim kits for both the rear springs, and drive shaft center velocity joint. So maybe that's where they're confused.
I'll post when I get some answers Mon. after the fact.
Capt.
My truck is in the shop Mon. for a dull type of clunk, thump, when taking off from a dead stop somethimes, and they had to order shims. I didn't talk to the mechanic, and one service manager says the shims are for rear axle springs, the other manager I talked with said it was for the rear end. But Mon. I'll know when the mechanic prints out the service job in detail.
I did check the bulletins for the truck and they had shim kits for both the rear springs, and drive shaft center velocity joint. So maybe that's where they're confused.
I'll post when I get some answers Mon. after the fact.
Capt.
I don't know if he's already greased the shaft or not. But with my camper on I haven't noticed the thump. So you may be right there.
They have a good service dept. and I'll let them do what they're going to do Mon. and see what else he might of done. They give me a slip useually and tells all what they've done. Then I'll go from there.
Thanks for the reply.
I'll keep you posted. Mon. nite.
Capt.
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Fleet Mechanic
Joined: Dec 2002
Posts: 1,664
Likes: 188
Originally posted by capt caper
My truck is in the shop Mon. for a dull type of clunk, thump, when taking off from a dead stop somethimes, and they had to order shims. I didn't talk to the mechanic, and one service manager says the shims are for rear axle springs, the other manager I talked with said it was for the rear end. But Mon. I'll know when the mechanic prints out the service job in detail.
I did check the bulletins for the truck and they had shim kits for both the rear springs, and drive shaft center velocity joint. So maybe that's where they're confused.
I'll post when I get some answers Mon. after the fact.
Capt.
My truck is in the shop Mon. for a dull type of clunk, thump, when taking off from a dead stop somethimes, and they had to order shims. I didn't talk to the mechanic, and one service manager says the shims are for rear axle springs, the other manager I talked with said it was for the rear end. But Mon. I'll know when the mechanic prints out the service job in detail.
I did check the bulletins for the truck and they had shim kits for both the rear springs, and drive shaft center velocity joint. So maybe that's where they're confused.
I'll post when I get some answers Mon. after the fact.
Capt.
The reciept said pinion angle was off. So they installed shims to correct angle.
They did something to the rear axle spring area. They took the bolts off holding down the springs to axle and changed height I guess with shims.
The clunk went away. Will see what happens with the camper on. It weights 4,000 lbs.
Capt.
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