trauski
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• indianapolis, IN, USA |
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• Registered on 3/10/2003 |
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• 44 posts |
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 Posted:3/24/2003 14:04 |
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my 2000 x makes a thus when i come to a stop. especially if yoiu have to stop quik. it seems that it makes the noise as the rocks front to back from stopping. then when you give it the gas to take off it thuds in the rear upon take off. is this normal or what do you think is going on? |
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E. Long
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• Subscriber since 1/1/2001 |
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• Atlanta, GA, USA |
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• Registered on 1/23/2001 |
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• 2,229 posts |
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Posted:3/24/2003 17:10 |
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| Quote: | | my 2000 x makes a thus when i come to a stop. especially if yoiu have to stop quik. it seems that it makes the noise as the rocks front to back from stopping. then when you give it the gas to take off it thuds in the rear upon take off. is this normal or what do you think is going on? |
Hi,
It sounds like you have a bad u-joint. To test it, park your X on a flat surface, put on the parking break, put the tranny in neutral, and block the tires so the vehicle doesn't roll -- crawl underneath and twist the rear driveshaft both directions, see if you can move it in any other direction as well. There should be no "play" in it at all. With what you describe though, my guess is that there will be play in the driveshaft.
The driveshaft is the link between your transfer case (which is attached to your transmission) and your rearend. When there is play in this "link of the chain" you will feel a clunking noise whenever your vehicle stops or starts.
There are ujoints on the front and rear of the driveshaft. Either one may be bad. When you're underneath and trying to twist the driveshaft, you should be able to pinpoint the problem.
If you feel like there's no play in the driveshaft, then it's most likely not a ujoint problem and could be suspension-related. Let us know what you find...
-Eric
'67 Galaxie 500 - 390 FE, .030" over, FE to AOD adapter, disc brake conversion. The Daily Driver.
'00 Excursion - 7.3L PSD, LANDYOT Gen-II Radius Rods, Factory Tech Valve Body, 200K+ miles and going |
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gearman
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• los Angeles, CA, USA |
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• Registered on 1/22/2003 |
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• 336 posts |
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Posted:3/24/2003 20:30 |
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i work on a lot of 4x4s,i have owned a lot of 4x4s.you might have worn leaf springs.if your mounts(motor and transmission) are good,and as Eric mentioned,your u-joints checked out,then you have the 4-wheelers dilema.sloppy springs.they all seem to do it after a while.
01 excursion psd hellwig rear stabalizer 285 michelins suncoast converter transmission custom built with Transgo shift kit,by me.
TTS computer chip,next mod-TTS exhaust system
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trauski
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• indianapolis, IN, USA |
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• Registered on 3/10/2003 |
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• 44 posts |
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Posted:3/25/2003 09:38 |
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thanks for the tips. i will get her checked out eventually. i just got my etended ford premium warrenty in the mail today, that was transferred when i bought the x 2 weeks ago. i hate to take it in for bumps and noises as i figure they say nothing wrong and ill get charged. |
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Wheels
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• Visalia, CA, USA |
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• Registered on 1/20/2003 |
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• 214 posts |
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Posted:3/25/2003 16:52 |
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I had the exact same problem. Turned out in my case it was just the slip yoke needed to be lubed. Here are the instructions I followed http://www.clubfte.com/users/monsta/SuperDutyFAQ.html After you go to the site, click on "Rolling Chassis" and you'll find a question about a clunk. That is where the instructions are. Check it out, took me about 30 minutes cause I work slow.
Jason |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
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Posted:3/26/2003 15:57 |
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Mine did the same thing. Slip yoke definantly. If you lube it yourself, please make sure you set the parking brake!
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trauski
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• indianapolis, IN, USA |
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• Registered on 3/10/2003 |
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• 44 posts |
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Posted:3/28/2003 13:21 |
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x is at dealer with ext warr. went their at lunch and told tech about thud. i grabbed the rear drive shaft and it had play. tech said he would grease slip yoke should get rid of it. waiting for new bearing in rear end se other post. |
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Dave Sullivan
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• Kitchener, XX, Canada |
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• Registered on 2/27/2003 |
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• 199 posts |
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Posted:3/28/2003 20:13 |
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Ok I'm curious... how exactly does the slip joint cause a thump on start and stop.
Dave. |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2
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Posted:3/29/2003 15:58 |
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Due to the lack of cushioning grease, when the shaft rotates the splines bang up against each other.
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Dave Sullivan
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• Kitchener, XX, Canada |
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• Registered on 2/27/2003 |
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• 199 posts |
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Posted:3/29/2003 21:06 |
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Nope. I dont buy it. The male spline is dipped in some kind of plastic or teflon and then tight fitted into the female shaft. The result is a very snug fit with little back lash in the the rotating direction. The only way that shaft should be moving is in the longetudinal. If there is play between the two shafts then that means the coating has broken down and needs to be replaced. Grease does not solve the problem. It is unlikely to be a cushining device in the rotating direction. It is intended to provide lubrication for the two shafts to slip back and forth in the longitudinal direction. IE: in and out. All you have to do is pull the two shafts apart and inspect the male splines. They should have a solid coating on them (probably blue) and in good shape. No pieces. (Generaly long strings.)You would have to treat the vehicle pretty rough to have that kind of damage so soon.
Further. The description says that the vehicle was making the noise during the rocking back and forth when the vehicle was stopped. This implies that the wheels were locked by the brakes which means the that the drive shafts are not rotating.
I would inspect the shafts and keep looking.
Dave.
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