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jumpy... loapy... Rompy... sensation... while driving

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Old Mar 24, 2017 | 12:33 PM
  #1  
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jumpy... loapy... Rompy... sensation... while driving

This problem is similar to the sensation of warped brake rotors when braking but this is not a braking issue.

You feel it in the seat and its a vertical sensation versus a horizontal. Sometimes it will present minimally when releasing the brake from a dead stop. it is not a speed dependent issue. Mostly I feel it when letting off the pedal and coasting. It is not localized to the front or rear axle but seems rather to be throughout the whole truck driveline...

Any ideas.. thanks.
 
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Old Mar 24, 2017 | 02:36 PM
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Drop your rear driveshaft and replace your U-joints if you haven't in a while. Use spicers if you can get them.

Denny
 
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Old Mar 24, 2017 | 02:42 PM
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tranny low on fluid, carrier bearing shot, ujoint bad, carrier bearing rubber failing causing driveline off center


bent wheel, bad wheel bearing, bent axle, tire out of round, bubble in tire
 
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Old Mar 24, 2017 | 05:07 PM
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grease the splines on your drive shaft using the Ford specific grease. Try that first, then if that doesn't do it, try the universals next.
 
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Old Mar 25, 2017 | 04:53 PM
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Ok..

I did the u joints about 3 to 4 years ago.. Spicer non-greaseable kind.

what about the rear end ?
 
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Old Mar 26, 2017 | 10:32 AM
  #6  
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I run thru a rear joint every 2 years or so. My effect is a vibration just off throttle. Then I know it's time.

The easy way to isolate your problem is to remove the rear shaft completely and lock in your hubs and run in four high and see if the vibe disappears. Index your driveshaft first so you know to replace it exact.

This will allow you to service the shaft/joints after you do isolate it.

Denny
 
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Old Mar 26, 2017 | 11:39 AM
  #7  
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I'll stand with Jason on this one. Sounds a lot like a sticking slip yolk on the driveline.
 
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Old Mar 26, 2017 | 02:23 PM
  #8  
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Slip yoke

Anyone ever do the drill and tap on the drive shaft in order to grease the splines easier? I always have such a difficult time pressing it back together.
 
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Old Mar 26, 2017 | 07:05 PM
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Originally Posted by HKusp
grease the splines on your drive shaft using the Ford specific grease. Try that first, then if that doesn't do it, try the universals next.
Do you know that specific grease from Ford, or just ask dealer for driveshaft spline grease? Thanks

Just replaced joints and I have the exact same off-brake release feel in differential.
 
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Old Mar 28, 2017 | 02:18 PM
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It could be clown car syndrome!

Drive at walking speed on a smooth road.
You will get a kind of rocking feeling.
One of your tires is separating and has a lump on it.
You can really feel it at very low speed.
 
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Old Mar 28, 2017 | 05:40 PM
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I highly suggest you do not drive the truck over 40 MPH until you have determined you do not have a bad u-joint, slip yoke or out of balance drive-shaft. Just get it rebuilt for insurance. The slip yoke will be hard to tell.

Mine had both. Noticeable vibration that increased with speed when I bought the truck. Figured I would get it fixed soon so no biggie... I drove it home and as soon as I was at highway speed for about 15 minutes the noise went away... because it cracked my ****ing tail-housing on the transmission. The vibration from the driveshaft started whipping the transfer case around and POP. The previous owner never took the truck on the freeway in the last few years so he would have never known. I have never seen anything like that... but I also have driven better quality vehicles my whole life (Toyota/Nissan).

A new tail-housing alone is $450 plus a ****-ton of work. My truck has been down for 2 weeks. My advice is pull your driveshaft and spend $350 to get it rebuilt now vs. dealing with what I have later...
 
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Old Mar 31, 2017 | 11:48 AM
  #12  
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Thanks for the feedback...

I'm gonna grease the yoke and see what happens.
I also know that the pinion seal needs to be replaced.
u joints are non-greaseable.
 
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Old Apr 1, 2017 | 12:44 AM
  #13  
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Take a look through my thread about vibration and universals in the rear driveshaft. I got a lot of good advice. Maybe something in there can help?

https://www.ford-trucks.com/forums/1...oint-shot.html

Good luck
 
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