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From: Nate Nagel on 4 Aug 2010 19:41
Hi all,

just got my F-150 back from the shop today... needed new U-joints. I
find now that I have a vibration - not severe, but enough to be annoying
- between 35 and 45 MPH. Really feels like driveshaft. Wasn't there
prior to install of new U-joints. Checked shop manual (yes, I have it)
and it says that 2-piece driveshaft cannot be phased wrong due to master
spline. Any ideas what else this could possibly be?

Unrelated, but I also now have an ABS trouble code... so it's going back
to the shop tomorrow anyway :( I did check plug on diff, it is still
plugged in.

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel
From: Paul on 4 Aug 2010 19:57
Nate Nagel wrote:
> Hi all,
>
> just got my F-150 back from the shop today... needed new U-joints. I
> find now that I have a vibration - not severe, but enough to be annoying
> - between 35 and 45 MPH. Really feels like driveshaft. Wasn't there
> prior to install of new U-joints. Checked shop manual (yes, I have it)
> and it says that 2-piece driveshaft cannot be phased wrong due to master
> spline. Any ideas what else this could possibly be?
>
> Unrelated, but I also now have an ABS trouble code... so it's going back
> to the shop tomorrow anyway :( I did check plug on diff, it is still
> plugged in.
>
> nate
>
See if the u-joints are off center.
From: m6onz5a on 4 Aug 2010 21:32
On Aug 4, 7:41 pm, Nate Nagel <njna...(a)roosters.net> wrote:
> Hi all,
>
> just got my F-150 back from the shop today... needed new U-joints.  I
> find now that I have a vibration - not severe, but enough to be annoying
> - between 35 and 45 MPH.  Really feels like driveshaft.  Wasn't there
> prior to install of new U-joints.  Checked shop manual (yes, I have it)
> and it says that 2-piece driveshaft cannot be phased wrong due to master
> spline.  Any ideas what else this could possibly be?
>
> Unrelated, but I also now have an ABS trouble code... so it's going back
> to the shop tomorrow anyway :(  I did check plug on diff, it is still
> plugged in.
>
> nate
>
> --
> replace "roosters" with "cox" to reply.http://members.cox.net/njnagel

They probably didn't mark where the driveshaft was before they removed
it, and didn't put it back in the same position during installation.
From: jim beam on 5 Aug 2010 11:59
On 08/04/2010 07:17 PM, lugnut wrote:
> On Wed, 04 Aug 2010 19:41:12 -0400, Nate Nagel
> <njnagel(a)roosters.net> wrote:
>
>> Hi all,
>>
>> just got my F-150 back from the shop today... needed new U-joints. I
>> find now that I have a vibration - not severe, but enough to be annoying
>> - between 35 and 45 MPH. Really feels like driveshaft. Wasn't there
>> prior to install of new U-joints. Checked shop manual (yes, I have it)
>> and it says that 2-piece driveshaft cannot be phased wrong due to master
>> spline. Any ideas what else this could possibly be?
>>
>> Unrelated, but I also now have an ABS trouble code... so it's going back
>> to the shop tomorrow anyway :( I did check plug on diff, it is still
>> plugged in.
>>
>> nate
>
>
> I don't know what the manual is talking about when it
> indicates the drive shaft cannot be out of phase or has a
> master spline. My '93 has no master spline and can
> definitely be slipped together out of phase. It is not hard
> to look at the joint alignment a see if they are properly
> aligned. It has been my experience that the driveline
> sections must be rebalanced when the joints are replaced.
> The requirement is greatly reduced by marking the tubes so
> they can be reassembled as they were originally. Rebalance
> is still a good idea. Another problem with them is pressing
> the joints together too tightly making the joint stiff which
> will have vibration similar to imbalance. It is also good
> to replace the midship bearing when the joints are replaced.
>
> Lugnut

what he said

--
nomina rutrum rutrum
From: N8N on 5 Aug 2010 16:15
On Aug 4, 10:17 pm, lugnut <lug...(a)roadkill.net> wrote:
> On Wed, 04 Aug 2010 19:41:12 -0400, Nate Nagel
>
> <njna...(a)roosters.net> wrote:
> >Hi all,
>
> >just got my F-150 back from the shop today... needed new U-joints.  I
> >find now that I have a vibration - not severe, but enough to be annoying
> >- between 35 and 45 MPH.  Really feels like driveshaft.  Wasn't there
> >prior to install of new U-joints.  Checked shop manual (yes, I have it)
> >and it says that 2-piece driveshaft cannot be phased wrong due to master
> >spline.  Any ideas what else this could possibly be?
>
> >Unrelated, but I also now have an ABS trouble code... so it's going back
> >to the shop tomorrow anyway :(  I did check plug on diff, it is still
> >plugged in.
>
> >nate
>
> I don't know what the manual is talking about when it
> indicates the drive shaft cannot be out of phase or has a
> master spline.  My '93 has no master spline and can
> definitely be slipped together out of phase.  It is not hard
> to look at the joint alignment a see if they are properly
> aligned.  It has been my experience that the driveline
> sections must be rebalanced when the joints are replaced.
> The requirement is greatly reduced by marking the tubes so
> they can be reassembled as they were originally.  Rebalance
> is still a good idea.  Another problem with them is pressing
> the joints together too tightly making the joint stiff which
> will have vibration similar to imbalance.   It is also good
> to replace the midship bearing when the joints are replaced.
>
> Lugnut

hey, I'm just reading the FSM. It clearly stated that it was
impossible to phase it incorrectly and visual inspection did not
reveal any issues. Unfortunately I just packed up all of my tools
last weekend so I really can't mess with it myself. I do not believe
that they replaced the carrier bearing; I probably would have were I
doing this myself, but whaddayagonnado.

Right now I'm waiting for the shop to call me and tell me that my
company car is ready (had them give it its regular service when I
picked up truck, so I'm just going to trade them back) and have them
address the ABS light, then it sounds like I need to find a good
spring and driveshaft type place to address this farther.

nate
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