Driveshaft slip yolk deviation... can this be right? (vid)
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Elder User
Joined: Dec 2009
Posts: 864
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From: Fort Campbell, KY
Driveshaft slip yolk deviation... can this be right? (vid)
Ok, I'm running down a vibration more like hop you get from a choppy road, and backlash between accel and deccel. It's a single solid driveshaft, longest before you have to have a two piece unit. So while capturing footage for that I saw this! WT% I'm sure most haven't seen it, but hoping you guys that have dyno'd or something may have. Is it time for a drive shaft?
Oh and pardon the inverted video, dang mount wouldn't cooperate.
<iframe src="http://www.youtube.com/embed/uuD2rI2slcQ?rel=0" allowfullscreen="" frameborder="0" height="349" width="560"></iframe>
Oh and pardon the inverted video, dang mount wouldn't cooperate.
<iframe src="http://www.youtube.com/embed/uuD2rI2slcQ?rel=0" allowfullscreen="" frameborder="0" height="349" width="560"></iframe>
Last edited by CPUNeck; Jul 1, 2011 at 10:45 PM. Reason: Clarify configuration
Fleet Mechanic
Joined: Jul 2005
Posts: 1,800
Likes: 52
From: Southern Colorado
Thanks for posting the excellent video!
I'm not surprised that the d-shaft does that much in-and-out. I have lubed mine twice and have given up on having a smooth launch. Mine binds when hot and unloaded. It clunks/sticks less with a trailer in tow or a load in the bed. In cold weather, mine is fine. I think my spline fit is too tight.
I have fought sticky slip yokes on every Ford truck I have owned (1976, 1990, 1999, 2001), and figure it's the nature of the beast.
I'm not surprised that the d-shaft does that much in-and-out. I have lubed mine twice and have given up on having a smooth launch. Mine binds when hot and unloaded. It clunks/sticks less with a trailer in tow or a load in the bed. In cold weather, mine is fine. I think my spline fit is too tight.
I have fought sticky slip yokes on every Ford truck I have owned (1976, 1990, 1999, 2001), and figure it's the nature of the beast.
Posting Guru
Joined: Mar 2008
Posts: 1,104
Likes: 5
From: West Tx
I would think you would get less movement with the driveshaft slip yoke at the carrier bearing. Your asembly is backwards from mine, where mine has the balance ring on the driveshaft at the differential.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
Looks like what happens when the slip yoke binds during fore and aft travel and has caused an enlargement of the spline race. There is orbital flexing rather then a straight line in and out travel. Disconnect the drive shaft at the diff and see how much flex there is between the spline and spline race. It should be very minimal. MHO
Cargo Master
Joined: Feb 2010
Posts: 2,298
Likes: 94
From: Delta, CO
Mine is like said above, makes me wonder if someone put the driveshaft in backwards.
Logistics Pro
Joined: Jun 2005
Posts: 4,243
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From: AZ
(If I am seeing his video correctly...on the right side of the video that is the rear differential correct?)...think I'll go buy a lottery ticket 
if mine has been in backwards all these years.
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Cargo Master
Joined: Feb 2010
Posts: 2,298
Likes: 94
From: Delta, CO
Well, either CPUneck's driveshaft is in backward OR the driveshaft in my F350 has been in backward for years (I do have the longbed CC though) and never gave me a bit of problem (If I am seeing his video correctly...on the right side of the video that is the rear differential correct?)...think I'll go buy a lottery ticket if mine has been in backwards all these years.
(If I am seeing his video correctly...on the right side of the video that is the rear differential correct?)...think I'll go buy a lottery ticket if mine has been in backwards all these years.
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Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
My SC E99 SWB one piece drive shaft is oriented the same as Casper's.
Functionally it doesn't matter which way it is oriented.
The difference is probably SWB one piece or LWB two piece rear drive shaft.
Functionally it doesn't matter which way it is oriented.
The difference is probably SWB one piece or LWB two piece rear drive shaft.
Logistics Pro
Joined: Jun 2005
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From: AZ
...
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
By one piece I mean it only has one drive shaft unlike the two piece drive shaft that has a carrier bearing between the front part and rear part of a two piece drive shaft.
PREMIUM SPONSOR
Joined: Feb 2009
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I have never seen a driveshaft "backwards" like that, even on short beds or excursions. But then again I had never seen an Excursion with a GPR rather than a GPCM until 2 weeks ago either.
Posting Guru
Joined: Dec 2007
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From: SEMO
