Vibration

A week or so ago my '85 SR5 ExtraCab pickup developed a vibration. The
vibration was there at about 55-60 mph. When going slower or faster it
was as smooth as ever.
Sunday I took a 100 mile trip and by the time I got back home the
vibration was there from about 20-70 mph and when I slowed to turn onto my
street the vibration had worsened to a definite knock and shook the whole
truck.
This morning I got under it and I could see that there was about 1/8 inch
side play in the rear u-joint so I decided that since one had gone bad the
other two were probably about ready to be replaced too so I replaced all
three of them.
This took about 99% of the vibration away but there is still a little when
I let off the gas and coast about 55 mph down to about 50.
Does anybody have any ideas what could be still causing the vibration?
I took the center carrier (with bearing) to a mechanic and he said that it
looked okay to him but when I put it back into the truck I could tell that
there was a little bit of side play in it; not enough to see but I could
feel that it was there.
If it is measurable at all I would guess that it couldn't be more than
1/32nd in side play. Could this be a cause for vibration?
The bearing rolls smoothly and the rubber in the carrier doesn't have any
cracks and nothing appears to be broken.
If the problem isn't in the carrier where else should I be looking. As I
said earlier, I replaced all three u-joints and I hope that it could be
something else rather than the carrier.
I called around and the price of a new carrier is from about $125 as
Schucks to $285 at the local Toyota dealer. I don't want to replace the
carrier if I don't have to.
Any suggestions???
jj

Have the driveshaft rebalanced.

On Tue, 28 Feb 2006 10:03:19 GMT, [email]jjones_001@yahoo.com[/email] (Jerry) wrote:
[color=blue]
>A week or so ago my '85 SR5 ExtraCab pickup developed a vibration. The
>vibration was there at about 55-60 mph. When going slower or faster it
>was as smooth as ever.
>Sunday I took a 100 mile trip and by the time I got back home the
>vibration was there from about 20-70 mph and when I slowed to turn onto my
>street the vibration had worsened to a definite knock and shook the whole
>truck.
>This morning I got under it and I could see that there was about 1/8 inch
>side play in the rear u-joint so I decided that since one had gone bad the
>other two were probably about ready to be replaced too so I replaced all
>three of them.
>This took about 99% of the vibration away but there is still a little when
>I let off the gas and coast about 55 mph down to about 50.
>Does anybody have any ideas what could be still causing the vibration?
>I took the center carrier (with bearing) to a mechanic and he said that it
>looked okay to him but when I put it back into the truck I could tell that
>there was a little bit of side play in it; not enough to see but I could
>feel that it was there.
>If it is measurable at all I would guess that it couldn't be more than
>1/32nd in side play. Could this be a cause for vibration?
>The bearing rolls smoothly and the rubber in the carrier doesn't have any
>cracks and nothing appears to be broken.
>If the problem isn't in the carrier where else should I be looking. As I
>said earlier, I replaced all three u-joints and I hope that it could be
>something else rather than the carrier.
>I called around and the price of a new carrier is from about $125 as
>Schucks to $285 at the local Toyota dealer. I don't want to replace the
>carrier if I don't have to.
>Any suggestions???
>jj[/color]

In article <d9t80211ndc06k8hl3dpno8coc3h1oqroi@4ax.com>, [email]admin@snoman.com[/email]
says...[color=blue]
>
>
>Have the driveshaft rebalanced.
>
>On Tue, 28 Feb 2006 10:03:19 GMT, [email]jjones_001@yahoo.com[/email] (Jerry) wrote:
>[color=green]
>>A week or so ago my '85 SR5 ExtraCab pickup developed a vibration. The
>>vibration was there at about 55-60 mph. When going slower or faster it
>>was as smooth as ever.
>>Sunday I took a 100 mile trip and by the time I got back home the
>>vibration was there from about 20-70 mph and when I slowed to turn onto[/color][/color]
my[color=blue][color=green]
>>street the vibration had worsened to a definite knock and shook the[/color][/color]
whole[color=blue][color=green]
>>truck.
>>This morning I got under it and I could see that there was about 1/8[/color][/color]
inch[color=blue][color=green]
>>side play in the rear u-joint so I decided that since one had gone bad[/color][/color]
the[color=blue][color=green]
>>other two were probably about ready to be replaced too so I replaced all
>>three of them.
>>This took about 99% of the vibration away but there is still a little[/color][/color]
when[color=blue][color=green]
>>I let off the gas and coast about 55 mph down to about 50.
>>Does anybody have any ideas what could be still causing the vibration?
>>I took the center carrier (with bearing) to a mechanic and he said that[/color][/color]
it[color=blue][color=green]
>>looked okay to him but when I put it back into the truck I could tell[/color][/color]
that[color=blue][color=green]
>>there was a little bit of side play in it; not enough to see but I could[/color][/color]
[color=blue][color=green]
>>feel that it was there.
>>If it is measurable at all I would guess that it couldn't be more than
>>1/32nd in side play. Could this be a cause for vibration?
>>The bearing rolls smoothly and the rubber in the carrier doesn't have[/color][/color]
any[color=blue][color=green]
>>cracks and nothing appears to be broken.
>>If the problem isn't in the carrier where else should I be looking. As[/color][/color]
I[color=blue][color=green]
>>said earlier, I replaced all three u-joints and I hope that it could be
>>something else rather than the carrier.
>>I called around and the price of a new carrier is from about $125 as
>>Schucks to $285 at the local Toyota dealer. I don't want to replace the
>>carrier if I don't have to.
>>Any suggestions???
>>jj[/color][/color]

The driveshaft was fine until the u-joint went bad. Is it probable that
it could be thrown off balance permanently by the bad u-joint? That seems
very unlikely to me but I suppose that it's possible.
Have you ever heard of this being the cause of a driveline going out of
balance?
jj

Jerry I agree get the shafts balanced as you have just fitted new joints and
they are not the exact shape size and mass of the old ones, during the
vibration a balance weight may have come off. When changing joints it is
just good practice to balance shafts . Give the shop doing the job the two
shafts and ask them about the centre bearing, they will probably suggest
replacing it.

Joe


"Jerry" <jjones_001@yahoo.com> wrote in message
news:HdVMf.4002$VI6.487@newsread1.news.pas.earthlink.net...[color=blue]
>A week or so ago my '85 SR5 ExtraCab pickup developed a vibration. The
> vibration was there at about 55-60 mph. When going slower or faster it
> was as smooth as ever.
> Sunday I took a 100 mile trip and by the time I got back home the
> vibration was there from about 20-70 mph and when I slowed to turn onto my
> street the vibration had worsened to a definite knock and shook the whole
> truck.
> This morning I got under it and I could see that there was about 1/8 inch
> side play in the rear u-joint so I decided that since one had gone bad the
> other two were probably about ready to be replaced too so I replaced all
> three of them.
> This took about 99% of the vibration away but there is still a little when
> I let off the gas and coast about 55 mph down to about 50.
> Does anybody have any ideas what could be still causing the vibration?
> I took the center carrier (with bearing) to a mechanic and he said that it
> looked okay to him but when I put it back into the truck I could tell that
> there was a little bit of side play in it; not enough to see but I could
> feel that it was there.
> If it is measurable at all I would guess that it couldn't be more than
> 1/32nd in side play. Could this be a cause for vibration?
> The bearing rolls smoothly and the rubber in the carrier doesn't have any
> cracks and nothing appears to be broken.
> If the problem isn't in the carrier where else should I be looking. As I
> said earlier, I replaced all three u-joints and I hope that it could be
> something else rather than the carrier.
> I called around and the price of a new carrier is from about $125 as
> Schucks to $285 at the local Toyota dealer. I don't want to replace the
> carrier if I don't have to.
> Any suggestions???
> jj
>[/color]