Odd thump during acceleration
Tuned
Joined: Nov 2005
Posts: 444
Likes: 2
Originally Posted by DIeselmanRI
I'm not so sure it's gear lash. I understand what is said about a big truck with torque. However, (and I'm not trying to start a brand war pissing match), I also have a 2001 Dodge ram 3500 4x4. It has a Dana 80 posi rear. Last time I dynoed, I had 425 rwhp and 899 ftbs (yes, it has a Cummins). There are no issues with that truck like I'm experiencing with this new truck. I also converted the Dodge from an automatic to a 6 spd manual (myself) which included lengthing the front drive shaft and shortening the rear shaft. I experienced no ill effects.
With that said, I have been trying to see if accelerating differently makes a difference. Slower accels help, but if you listen, you can still hear the noise.
It almost feels like a brake bind, as if the rear pads are not releasing quick enough.
I'm going to the dealer tomorrow morning. Hopefully they will know what is causing this.
I will post again on Monday with what the dealer says.
Thanks again
George
With that said, I have been trying to see if accelerating differently makes a difference. Slower accels help, but if you listen, you can still hear the noise.
It almost feels like a brake bind, as if the rear pads are not releasing quick enough.
I'm going to the dealer tomorrow morning. Hopefully they will know what is causing this.
I will post again on Monday with what the dealer says.
Thanks again
George
Thread Starter
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New User
Joined: Mar 2006
Posts: 9
Likes: 0
I went to the dealer on Sat. they took it out for a spin.
Looked up TSB's and they are going to start with the easiest (cheapest) thing first. Truck is going in tomorrow to have the driveshaft spline lubed. If this doesn't work, they will look into the pinion angle (there is a TSB stating that it MAY need to be shimmed).
Dealer said it doesn't appear to be the rakes sticking.
Thanks again for the help.
george
Looked up TSB's and they are going to start with the easiest (cheapest) thing first. Truck is going in tomorrow to have the driveshaft spline lubed. If this doesn't work, they will look into the pinion angle (there is a TSB stating that it MAY need to be shimmed).
Dealer said it doesn't appear to be the rakes sticking.
Thanks again for the help.
george
Senior User
Joined: Feb 2004
Posts: 143
Likes: 0
From: Sand Dune, CA
Guys,
I really think the lack of grease on the spines is causing the thump.
Before I removed my driveshaft last weekend, I was checking for free play and noise by rotating the driveshaft. What I discovered was a "thump" coming from the "spline" section of the driveshaft. Next I pulled the driveshaft and physically inspected the splines - no grease. Now, here is the interesting part, when I pulled the splined section of the driveshaft out of the transfer case, ATF began flowing out of the transfer case. I would guess half a quart then it stopped. When I ran my finger inside the splined section of the driveshaft it felt like fluid residue, not grease.
Here's my theory: I believe the ATF is "washing out" the grease on the splines. If you read some of the posts, greasing the splines only worked for a short time for some trucks. There maybe a correlation between how much grease is added and miles driven, combined with the "washing out" effect before the "thump" returns.
I would like to know if the "thump" is only a problem with trucks that have a transfer case (4 wheel drive), or are 2 wheel drive trucks affected as well.
I really think the lack of grease on the spines is causing the thump.
Before I removed my driveshaft last weekend, I was checking for free play and noise by rotating the driveshaft. What I discovered was a "thump" coming from the "spline" section of the driveshaft. Next I pulled the driveshaft and physically inspected the splines - no grease. Now, here is the interesting part, when I pulled the splined section of the driveshaft out of the transfer case, ATF began flowing out of the transfer case. I would guess half a quart then it stopped. When I ran my finger inside the splined section of the driveshaft it felt like fluid residue, not grease.
Here's my theory: I believe the ATF is "washing out" the grease on the splines. If you read some of the posts, greasing the splines only worked for a short time for some trucks. There maybe a correlation between how much grease is added and miles driven, combined with the "washing out" effect before the "thump" returns.
I would like to know if the "thump" is only a problem with trucks that have a transfer case (4 wheel drive), or are 2 wheel drive trucks affected as well.
New User
Joined: Jan 2006
Posts: 10
Likes: 0
Do a search on this forum for this. Common issue - related to rear diff. in my case. My '05 FX4 4x4 stopped doing this after driving through some Wadi's in Low Range for about 30 km's. Truck has done 5000 km's now and the noise dissappeared at about 3000 km.'s
There are various theories on this noise - I have never seen a solid answer for this "clunk".
Good luck.
There are various theories on this noise - I have never seen a solid answer for this "clunk".
Good luck.
New User
Joined: Apr 2006
Posts: 2
Likes: 0
Odd Thump during acceleration
Hello, I have a 2005 F150 w/8,000 miles. I have had in back 2 times for this and each time they grease the drive shaft and it goes away for about 2,000 miles. It is back again, and really thumps now. I wish I knew exactly what was going on here before I take it back again. Has anyone actually had theirs fixed properly by Ford or know what it is?
Chris
Chris
Thread Starter
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New User
Joined: Mar 2006
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Took it to the dealer yesterday. They greased the splines.
No noise for now. However, the Tech told me they didn't stoc the grease the TSB is telling them to use, so he used the same grease he used for others. He said he ordered the correct grease, and when I take the truck in for it's first oil change (free) that he will re-lube with the correct grease.
Maybe the type of grease is the issue?
No noise for now. However, the Tech told me they didn't stoc the grease the TSB is telling them to use, so he used the same grease he used for others. He said he ordered the correct grease, and when I take the truck in for it's first oil change (free) that he will re-lube with the correct grease.
Maybe the type of grease is the issue?
Senior User
Joined: Aug 2004
Posts: 264
Likes: 0
From: SE Michigan
I was having the same issue on my 05 4X4 . The dealer put in a new drive shaft, according to them they found wear in the slip yoke. Has been fine for the last 600 miles.
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Brett Foote
Senior User
Joined: Oct 2004
Posts: 140
Likes: 0
From: NORCAL
Mine was doing the same thing, had the yoke lubed, didn't work. They say they didn't notice anything when driving it, yeah right, great technicians. I didn't have time to argue so I left, but I will take it back when I can leave it longer. It is definitely a "slip clunk" in the rear end.
Freshman User
Joined: Nov 2005
Posts: 31
Likes: 0
Slip/clunk
I have battling this for over a year. Several trips and two dealers later I think it may be gone. They started out with the greasing of yoke, temp. better. I have had the 4x4 solenoid replaced, no better and finally got a good mechanic who per tsb had to install a rear leaf spring spacer kit to change the angle, still stuttered so he went to the next step of replacing the clutch paks, bearings, new rear diff. fluid with a limited slip additive and it is gone. I only have a couple hundred miles on it but it feels much much tighter and different than it used to. No more stutter. Only time will tell........
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
You would think that by now Ford would have put grease fittings back on the drive shaft. i've said that i thought this was a big mistake on Fords behave. If a man is to busy or lazy to crawl under his truck and grease the drive shaft and front end i think he needs to walk or call a cab. jmho.....
Freshman User
Joined: Nov 2005
Posts: 31
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Thump/shudder fix
I thought I would list the exact receipt from the dealer that has fixed my problem.The first thing they did was to install rear axle shims 1 degree, replace u bolts and center bolts. Still had chatter from dead stop on accel. the first step is to try and correct problem by changing the pinion angle, it didn't. Then they replaced the rear diff. clutches. Bulletin 05-13-1
BA Kit - rear axle & driveline
AB SPACER
friction modifier
seal
bearing asy.-ball
I am nearing a thousand miles since and it is completely gone.
Hope this helps.
BA Kit - rear axle & driveline
AB SPACER
friction modifier
seal
bearing asy.-ball
I am nearing a thousand miles since and it is completely gone.
Hope this helps.
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AVE8R
6.4L Power Stroke Diesel
6
Jul 11, 2017 07:41 AM
04, 2001, 2005, acceleration, acceration, clunk, drivetrain, f150, f250, ford, fords, fx4, slack, slip, thumping
