Need Help, Drive Shaft Vib
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Junior User
Joined: Jun 2009
Posts: 65
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Need Help, Drive Shaft Vib
Im new to this 70 F100 and i just changed the ujoints, rear output shaft seal, and pinion seal, Well my question is my drive shaft has some play in it where it slides up on the output shaft, so im getting some drive line vib
and i think it will wear the shaft seal out qiuck!
Sorry my trany is a 3spd on the tree, I dont know who is the mfg of it,
is there a bushing or a bearing for the yoke to ride on so there is no play?
Please Help!
Sorry im not a good at typing
and i think it will wear the shaft seal out qiuck!
Sorry my trany is a 3spd on the tree, I dont know who is the mfg of it,
is there a bushing or a bearing for the yoke to ride on so there is no play?
Please Help!
Sorry im not a good at typing
Senior User
Joined: Jun 2009
Posts: 170
Likes: 1
From: Salt Lake City, UT
There is no bearing for the splined yoke. Now, is this a two piece drive shaft or just one tube with u-joints on each end, one of which attaches directly to the differential yoke and the other end has a u-joint between a short splined shaft that goes into the rear of the transmission?
If it is that type, what you probably have is a spline that is worn out and letting the shaft "wobble" around some. Usually, this is not felt until it becomes quite bad, (loose in the splines), and when that occurs, the only correction is a new splined shaft, which is commonly called a "slip joint" by some folks. Most drive shaft places can come up with a good used one or a new one and make the necessary welding and balancing for you.
If this is a two piece shaft with a spline in the middle, make sure you "index" the u-joints so they are in the exact same place all along the entire drive shaft. If you put the rear shaft into the spline and the u-joints are turned differently than the forward u-joint, you intruduce an "out of balance" condition to the drive shaft. If this is the case, re-install the shaft lining up the u-joints and the vibration should go away. Good luck!
If it is that type, what you probably have is a spline that is worn out and letting the shaft "wobble" around some. Usually, this is not felt until it becomes quite bad, (loose in the splines), and when that occurs, the only correction is a new splined shaft, which is commonly called a "slip joint" by some folks. Most drive shaft places can come up with a good used one or a new one and make the necessary welding and balancing for you.
If this is a two piece shaft with a spline in the middle, make sure you "index" the u-joints so they are in the exact same place all along the entire drive shaft. If you put the rear shaft into the spline and the u-joints are turned differently than the forward u-joint, you intruduce an "out of balance" condition to the drive shaft. If this is the case, re-install the shaft lining up the u-joints and the vibration should go away. Good luck!
Senior User
Joined: Oct 2007
Posts: 281
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From: Kernersville, NC
If this is a two piece shaft with a spline in the middle, make sure you "index" the u-joints so they are in the exact same place all along the entire drive shaft. If you put the rear shaft into the spline and the u-joints are turned differently than the forward u-joint, you intruduce an "out of balance" condition to the drive shaft. If this is the case, re-install the shaft lining up the u-joints and the vibration should go away. Good luck!
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
If this truck has a two piece driveshaft, it has three U-joints and a driveshaft center support which is composed of a sealed bearing, a large U shaped rubber support, misc brackets and shims.
If the driveshaft's center support bearing is defective, this will cause a vibration. If the rubber support is decomposing, this will cause a vibration.
If the driveshaft yoke that slides onto the transmissions output shaft is scored, here's another reason for a vibration.
With a two piece driveshaft, there is another yoke between the drive shaft and the coupling (rear drive) shaft. It could be scored, or out of round.
Then there's this possibility. If the drive shaft when it was removed, was propped up somewhere and fell over, it's now out of balance.
If the driveshaft's center support bearing is defective, this will cause a vibration. If the rubber support is decomposing, this will cause a vibration.
If the driveshaft yoke that slides onto the transmissions output shaft is scored, here's another reason for a vibration.
With a two piece driveshaft, there is another yoke between the drive shaft and the coupling (rear drive) shaft. It could be scored, or out of round.
Then there's this possibility. If the drive shaft when it was removed, was propped up somewhere and fell over, it's now out of balance.
Senior User
Joined: Oct 2007
Posts: 281
Likes: 0
From: Kernersville, NC
Im new to this 70 F100 and i just changed the ujoints, rear output shaft seal, and pinion seal, Well my question is my drive shaft has some play in it where it slides up on the output shaft, so im getting some drive line vib
and i think it will wear the shaft seal out qiuck!
Sorry my trany is a 3spd on the tree, I dont know who is the mfg of it,
is there a bushing or a bearing for the yoke to ride on so there is no play?
Please Help!
Sorry im not a good at typing
and i think it will wear the shaft seal out qiuck!
Sorry my trany is a 3spd on the tree, I dont know who is the mfg of it,
is there a bushing or a bearing for the yoke to ride on so there is no play?
Please Help!
Sorry im not a good at typing
Just exactly HOW MUCH play are we talking about?
If the play is not excessive, we may be chasing our tails trying to diagnose this, as there are many things that could cause a vibration that may be misdiagnosed as a driveline vibration.
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Junior User
Joined: Jun 2009
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Great thanks for all the advice,
The shaft is a one piece shaft, and the play is not much but there is some and i was talking to some one and he said there is a bushing in the tailshaft houseing , But i did not index the ujoints, (
) so i do need to go back and do that.
They play is like the ujoint is worn out
Like i said not much play so im going to look around some more.
Thank you guys!!!!!!!
The shaft is a one piece shaft, and the play is not much but there is some and i was talking to some one and he said there is a bushing in the tailshaft houseing , But i did not index the ujoints, (
) so i do need to go back and do that.They play is like the ujoint is worn out
Like i said not much play so im going to look around some more.
Thank you guys!!!!!!!
Senior User
Joined: Oct 2007
Posts: 281
Likes: 0
From: Kernersville, NC
Great thanks for all the advice,
The shaft is a one piece shaft, and the play is not much but there is some and i was talking to some one and he said there is a bushing in the tailshaft houseing , But i did not index the ujoints, ( ) so i do need to go back and do that.
They play is like the ujoint is worn out
Like i said not much play so im going to look around some more.
Thank you guys!!!!!!!
The shaft is a one piece shaft, and the play is not much but there is some and i was talking to some one and he said there is a bushing in the tailshaft houseing , But i did not index the ujoints, (
) so i do need to go back and do that.They play is like the ujoint is worn out
Like i said not much play so im going to look around some more.
Thank you guys!!!!!!!
Check to make sure that the U-joints are centered in the yokes. That's a common problem when replacing them. If they're not centered well, that lets the driveshaft rotate in an off-center pattern.
You may also have issues with driveline angles. Has the truck been lowered or raised???
Does the vibration get worse as speed increases? Do you feel it only at certain speeds?
Can you replicate the vibration sitting still with the transmission in neutral and by revving the engine?
Have you checked your motor supports and transmission support?
Is the vibration a "fine" vibration (slight and very rapid) or a "coarse" vibration (severe and harsh)?
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
You made the same mistake that many other ppl make. When the seal is replaced, the bushing should also be replaced.
What happens to the bushing: It can become scored, causing a vibration. Or can develop burrs that eventually will tear up the extension housing's seal.
B3TZ7A034B .. Extension Housing Bushing / B3TZ7A034B replaced B3TZ7A034A due to Ford changing the package quantity from one to two in the late 1980's.
Available from Ford and prolly every autoparts store on the planet.
This bushing has been used with myriad different transmissions (including A/T's) from 1953 thru today.
Every Ford 3 speed manual trans used this bushing from 1953 thru 1986.
Your truck has the: Ford Type 3.03 3 speed Manual all Syncromesh Transmisson.
This trans was used from 1963 thru 1983 in F100's / 1975/86 F150's / 1963/72 F250's / 1965/86 Econolines / 1966/77 Bronco's / Many 1963/80 Passenger Cars.
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