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Re: vibration update on the cuda
[Re: KatFysh]
#126885
09/27/08 04:37 PM
09/27/08 04:37 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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master
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OP
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Posts: 2,617
Stratford nj
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Quote:
I cracked a second tailshaft housing 3 weeks ago. I'm finally ready to go tear it apart tomorrow. What I'm gonna do is drop 3 lines. One from the balancer, 1 from the trans tailshaft and one from the rear pinion yoke. Then gonna check it with a laser level to see where the line runs from front to back. I'm thinking on mine that I may be off side to side with my trans crossmember. Also, did you use a new crush sleeve when you swapped yokes? I didn't on mine and that is another thought I had. Maybe the pinion isn't set correctly creating the vibrations.  But I'm not getting any groaning noises.
What I guess I'm asking here is, do you think that with all the times that you've had yours apart, that maybe the tailshaft isn't located exactly where it was before all this started, up/down & side to side  ? When was the very time you took it apart for this problem? What was wrong then?
i did put a new tail shaft on too. and when i changes yokes i did not put a new crush sleeve in, it still has vibes even when i put in a set of 3.23's.
the first time the tranny was apart was over the winter and after that is when they started, the front drum was wiped out, so now i have another new one in there and still now change
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Re: vibration update on the cuda
[Re: ProSport]
#126889
09/27/08 04:44 PM
09/27/08 04:44 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Stratford nj
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Quote:
Have you checked tire/wheel balance?
yup and even tried another set of tires and wheels
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Re: vibration update on the cuda
[Re: tazmaniac]
#126890
09/27/08 04:45 PM
09/27/08 04:45 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Stratford nj
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Quote:
How much endplay between convertor and flex plate, flexplate cracked?
how much should there be? the converter slide right up to the flex plate with no issues. i looked at the flex plate and rechecked the TQ specs too, and no issues there.
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Re: vibration update on the cuda
[Re: cudadan]
#126891
09/27/08 04:47 PM
09/27/08 04:47 PM
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Joined: Apr 2004
Posts: 12,339
somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
Quote:
and this is an 8 3/4 rear?
yes it is
and I take it you had the whole thing checked out..
weird man...all the components you had checked...yet usualy when a vibration takes out rear U joints would be...unbalanced drive shaft...bad u joints to begin with...bad pinion yoke or bearings to same...misalignment/..
if the axles were bad you would be eating gears and seals..
the suspension is all tight?...outside of installing a whole new drivetrain...got me hangin..
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Re: vibration update on the cuda
[Re: smokinwoody]
#126892
09/27/08 04:52 PM
09/27/08 04:52 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
master
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OP
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Joined: Aug 2003
Posts: 2,617
Stratford nj
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Quote:
Quote:
Quote:
and this is an 8 3/4 rear?
yes it is
and I take it you had the whole thing checked out..
weird man...all the components you had checked...yet usualy when a vibration takes out rear U joints would be...unbalanced drive shaft...bad u joints to begin with...bad pinion yoke or bearings to same...misalignment/..
if the axles were bad you would be eating gears and seals..
the suspension is all tight?...outside of installing a whole new drivetrain...got me hangin..
i know, this has me totally lost. i tired my stock axles too lol, and it only eats the rear u joint never the front one. if i run down the track i might get 2 passes out of the rear u joint, SUX unless the rear housing is somehow bent and dont know what the leaf springs would do if they were bad, cruizing around town its smooth as glass, till i get to 80mph then it goes south
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Re: vibration update on the cuda
[Re: KatFysh]
#126895
09/27/08 05:09 PM
09/27/08 05:09 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I cracked a second tailshaft housing 3 weeks ago. I'm finally ready to go tear it apart tomorrow. What I'm gonna do is drop 3 lines. One from the balancer, 1 from the trans tailshaft and one from the rear pinion yoke. Then gonna check it with a laser level to see where the line runs from front to back. I'm thinking on mine that I may be off side to side with my trans crossmember. Also, did you use a new crush sleeve when you swapped yokes? I didn't on mine and that is another thought I had. Maybe the pinion isn't set correctly creating the vibrations. But I'm not getting any groaning noises.
What I guess I'm asking here is, do you think that with all the times that you've had yours apart, that maybe the tailshaft isn't located exactly where it was before all this started, up/down & side to side ? When was the very time you took it apart for this problem? What was wrong then?
Cars and trucks are made with the pinion off-set
from the tail shaft to make sure the U-joint is
always working. But in racecars that I build I use
a laser mounted in the rear main of the block that
points directly on the pinion centerline then I
adjust the pinion angle to keep the U-joint working
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Re: vibration update on the cuda
[Re: cudadan]
#126896
09/27/08 05:53 PM
09/27/08 05:53 PM
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Joined: Aug 2003
Posts: 43,129
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,129
Bend,OR USA
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It is time to start isolating the cause or causes. Jack the car up(both ends) and put it on jack stands again under the suspension so all the weight is on the jackstands like it is on the track. Run it in gear first to make sure where the vibrations start and stop, RPM or MPHs . Shut the motor off and remove the rear tires, put all of the lug nuts back on tght enough to hold the brake drums on and test it agian, if the vibration is still there remove the break drums next and test agian. If thats not it do the axles next and retest again. The last thing to test is removing the driveshaft and that will allow some fluid to leak out. If none of those cure it then it is in the remaining parts, converter, trans, engine and so on. Test, test and test some more  There is no magic in these parts, some problems are harder to diaignose than others   Please let us know how it goes and what you find. BTW, are you lubing the new U joints with a good Hi temp wheel bearing grease before installing them If not do that next time and every time. U joints come with a rust preventive grese like cosmoleium (SP?) in them that is not intended to be ran on the road. I learn that the hard way One other thing to check is the pinion yoke and U joint alignment to the center of the pinion shaft, I had one pinion yoke that would not center the U joint which made the drive shaft wobble a very small amount.
Last edited by Cab_Burge; 09/27/08 05:58 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: vibration update on the cuda
[Re: tazmaniac]
#126897
09/27/08 06:00 PM
09/27/08 06:00 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
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OP
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Posts: 2,617
Stratford nj
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Quote:
show have .100-.200 endplay should not be tight possible at higher speeds without some endplay convertor will push up against pump.
i definately had between .100 and .200 or end play
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Re: vibration update on the cuda
[Re: Cab_Burge]
#126899
09/27/08 06:09 PM
09/27/08 06:09 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
master
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OP
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Posts: 2,617
Stratford nj
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Quote:
It is time to start isolating the cause or causes. Jack the car up(both ends) and put it on jack stands again under the suspension so all the weight is on the jackstands like it is on the track. Run it in gear first to make sure where the vibrations start and stop, RPM or MPHs . Shut the motor off and remove the rear tires, put all of the lug nuts back on tght enough to hold the brake drums on and test it agian, if the vibration is still there remove the break drums next and test agian. If thats not it do the axles next and retest again. The last thing to test is removing the driveshaft and that will allow some fluid to leak out. If none of those cure it then it is in the remaining parts, converter, trans, engine and so on. Test, test and test some more There is no magic in these parts, some problems are harder to diaignose than others Please let us know how it goes and what you find. BTW, are you lubing the new U joints with a good Hi temp wheel bearing grease before installing them If not do that next time and every time. U joints come with a rust preventive grese like cosmoleium (SP?) in them that is not intended to be ran on the road. I learn that the hard way One other thing to check is the pinion yoke and U joint alignment to the center of the pinion shaft, I had one pinion yoke that would not center the U joint which made the drive shaft wobble a very small amount.
, well 1st and second are smooth, in 3rd now with the car on stands i can feel a vibe at 35mph, i can feel this with my hand on the car, it comes and goes when i change rpms it will stop at certain speeds and rpms, then it will come back. At around 45 to 55 i dont feel it, the it starts to show up around 80. i dont see anything moving out of the ordinary. i measured the rear from side to side and the rear is 3/8" more to the passing side. if that matters or not., how bent would the rear housing have to be to cause this, or would it? i looked at the harmonic balancer and it doesnt even look like its moving, so i dont think theres an issue there, and the motor doesnt even look like its running thats how smooth it looks. if it was something thats not in or near the rear would it still cause only the rear ujoint to go bad. if it was something from the transmission tail shaft forward would it try to eat the front ujoint and not the rear. Im thinking its something in the back end cause it only eats the rear ujoint
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Re: vibration update on the cuda
[Re: Leigh]
#126900
09/27/08 06:10 PM
09/27/08 06:10 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Stratford nj
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Quote:
Probably not it, but, my truck slowly developed a cyclical vibration as the original leaf srings lost ride height. The faster I went, the worse it got.
im not even sure how old my springs are, i've had the car for 7yrs now and there the same ones
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Re: vibration update on the cuda
[Re: cudadan]
#126901
09/27/08 06:17 PM
09/27/08 06:17 PM
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Joined: Jan 2003
Posts: 5,987
Anoka County, MN
Leigh
master
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master
Joined: Jan 2003
Posts: 5,987
Anoka County, MN
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Quote:
Quote:
Probably not it, but, my truck slowly developed a cyclical vibration as the original leaf srings lost ride height. The faster I went, the worse it got.
im not even sure how old my springs are, i've had the car for 7yrs now and there the same ones
Since you've run it on jack stands, probably not the cause.
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Re: vibration update on the cuda
[Re: Leigh]
#126902
09/27/08 06:25 PM
09/27/08 06:25 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
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OP
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Quote:
Quote:
Quote:
Probably not it, but, my truck slowly developed a cyclical vibration as the original leaf srings lost ride height. The faster I went, the worse it got.
im not even sure how old my springs are, i've had the car for 7yrs now and there the same ones
Since you've run it on jack stands, probably not the cause.
lol wish full thinking
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