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"Thumping" under drivers side floorboard

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  #1  
Old 01-23-2014, 07:37 PM
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Default "Thumping" under drivers side floorboard

I have a 03 ram 1500 4x4 that I have been chasing down problems. It had a bad shake over 65mph so I finally got around to new tires, inner/outter tie rods, new lower ball joints, uppers are fine, new shocks and new brake pads/rotors/ and calipers. But now I get what I would describe as a thump feeling that seems to come and go with rotation of tire, somewhere on the drivers side I can feel in the floorboard. It only happens over 42mph, braking doesn't change it but it seems to quite down when accelerating. Truck was aligned after everything and tires have been balanced twice.

Any helpful insight would be appreciated, I'm reaching wits end working on this thing when it's below zero
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Old 01-23-2014, 11:45 PM
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Check and make sure nothing is stuck in the tire
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Old 01-24-2014, 06:20 AM
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I would check u-joints in front driveshaft.
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Old 01-26-2014, 08:01 PM
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i just checked the tire and nothing stuck or out of the ordinary. as far as front u joint are you referring to the front cv shaft? and whats the easiest best way to check them
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Old 01-27-2014, 11:40 AM
r-g_richards r-g_richards is offline
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I would also have the front hub bearing checked.
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Old 01-27-2014, 11:55 AM
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If it's 4wd you got a driveshaft that goes from transfer case to a flange at front differential. There's a ujoint that connects the driveshaft to the flange yoke.
How can you check it? I would simply unbolt those 4 bolts and remove that driveshaft. You don't need it unless you are using 4wd. Drive it and see if the problem is gone. If it is then it was that u-joint. They sell replacements that have zerk fittings. That way you can regrease ever so often and supposedly last longer. Good luck
The reason that's my 1st guess is that you feel it right under you in floor board and because, like me , it got better when accelerating.
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Old 01-27-2014, 03:13 PM
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Make sure you don't have a tire coming apart.
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Old 01-27-2014, 06:33 PM
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Tire seems good they are only a week and half old, I got the four bolts out for the driveshaft, how does it come out from there? I see a boot with a clamp. Does it all come out as one or just the main shaft and ujoint?
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Old 01-27-2014, 07:26 PM
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cut the clamp, then pull drive shaft out. You can use a zip tie for the boot. When you put it back.
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Old 01-27-2014, 08:21 PM
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Mine just slid right out.
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Old 01-27-2014, 10:23 PM
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Just wanted to make sure u didn't have to remove the pipe that runs below the shaft, I have it unbolted but couldn't figure out how to pull it out, even with the bolts out it seems fairly wedged in but I'll give it a go tomorrow depending how the weather is
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Old 01-27-2014, 11:39 PM
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Quote:
Originally Posted by irelandshemi View Post
Just wanted to make sure u didn't have to remove the pipe that runs below the shaft, I have it unbolted but couldn't figure out how to pull it out, even with the bolts out it seems fairly wedged in but I'll give it a go tomorrow depending how the weather is
You don't have to remove the splined shaft that comes out of the transfer case.
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Old 01-29-2014, 05:18 PM
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i finally got it off, the thumping went away today while driving without it. Though every once in a while i thought i felt a faint version of it but it very well could have been me just feeling a bump or something along those lines because i was focused on trying to feel something.
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Old 01-29-2014, 10:08 PM
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Quote:
Originally Posted by irelandshemi View Post
i finally got it off, the thumping went away today while driving without it. Though every once in a while i thought i felt a faint version of it but it very well could have been me just feeling a bump or something along those lines because i was focused on trying to feel something.
Thanks for the update...Winter roads around here with all the heaving creates lots of little noises/vibrations.
You can get free rental tools from autozone or AAP to easily replace the ujoint on that shaft.
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Old 01-30-2014, 05:39 AM
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Quote:
Originally Posted by irelandshemi View Post
i finally got it off,
IF you move the u-joint does it move freely, or is it seized?
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Old 02-07-2014, 06:35 PM
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Sorry for the long delay, between a death in the family and work times been tight, but the ujoint did not have Any noticeable play but I put a new one In anyways. The wobble is still there and usually happens right at 45mph on the dot. It was nice having it go away while I had the shaft off so any other ideas would be appreciated
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Old 02-07-2014, 07:19 PM
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Sounds like you removed the half shaft and not the driveshaft. The driveshaft goes from the transfer case (connected to the rear of the transmission to the front differential). The u joints are in an X shape.
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Old 02-07-2014, 10:05 PM
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That may mean the noise may be with the transfer case. A Chassis Ear type device would probably be helpful in homing in on the noise, but a mechanic might know what it is just by driving it and listening.
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Old 02-08-2014, 06:52 AM
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Quote:
Originally Posted by irelandshemi View Post
but the ujoint did not have Any noticeable play but I put a new one In anyways. The wobble is still there and usually happens right at 45mph on the dot. It was nice having it go away while I had the shaft off so any other ideas would be appreciated
Sorry to hear about your loss.
Was the wobble gone when the driveshaft not in place? In that case, if it wasn't the u-joint then probably the transfer case.
What do you mean by no noticeable play in u-joint? Do you mean it turned freely? Is this what you replaced? Click the image to open in full size.

Is this what you mean by front driveshaft?

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Old 02-08-2014, 04:28 PM
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Yeah it was the u joint out of the front shaft like you pictured, by no play I meant there was no looseness between the shaft and the "bracket" where the four bolts get bolted on. I guess wobble wouldn't be the best word to use but it is more of a thumping, the truck doesn't shake or anything as far as side to side. But removing the shaft made it basically go away
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