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Re: vibration update on the cuda
[Re: Sledge_57]
#126924
09/27/08 10:56 PM
09/27/08 10:56 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Posts: 2,617
Stratford nj
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Quote:
You said:
Quote:
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
I have a question now. Are you saying the problem started after the trans was put back together with a new front drum?
If so maybe the drum is bad and out of balance 
yes and i replaced it with another drum to have the same affect
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Post deleted by Defbob
[Re: cudadan]
#126925
09/27/08 11:59 PM
09/27/08 11:59 PM
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Anonymous
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Anonymous
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Re: vibration update on the cuda
#126926
09/28/08 08:52 AM
09/28/08 08:52 AM
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Joined: Mar 2006
Posts: 9,849
MI, usa
dvw
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For what its worth I have the same problem with my 73 Challenger. The vibration is rpm related to driveshaft speed. This is why the speed which it occurs changes with gear ratio. I have changed,balanced,swapped the following. Rear pigs & ratios,axles,drums,wheels & tires,driveshafts,trans & engine mounts. The difference is mine is a 4 speed. I can push the clutch in and it still vibrates. My u-joint angles mirror each other +1.5,-1.5. The only part I haven't swapped is the transmision. My bellhousing is dialed in both on center and square to the crank within .005". Sounds very similar. My bet (though I've never seen it) is the problem lies inthe outputshaft/tailshaft area.
Doug
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Re: vibration update on the cuda
#126927
09/28/08 09:22 AM
09/28/08 09:22 AM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Stratford nj
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Quote:
maybe the nut behind the wheel needs to be tightened 
thats is Fred you don't get anymore pix with Andrea LMAO
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Re: vibration update on the cuda
[Re: dvw]
#126928
09/28/08 09:24 AM
09/28/08 09:24 AM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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OP
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Joined: Aug 2003
Posts: 2,617
Stratford nj
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Quote:
For what its worth I have the same problem with my 73 Challenger. The vibration is rpm related to driveshaft speed. This is why the speed which it occurs changes with gear ratio. I have changed,balanced,swapped the following. Rear pigs & ratios,axles,drums,wheels & tires,driveshafts,trans & engine mounts. The difference is mine is a 4 speed. I can push the clutch in and it still vibrates. My u-joint angles mirror each other +1.5,-1.5. The only part I haven't swapped is the transmision. My bellhousing is dialed in both on center and square to the crank within .005". Sounds very similar. My bet (though I've never seen it) is the problem lies inthe outputshaft/tailshaft area.
Doug
do you still have this problem?
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Re: vibration update on the cuda
[Re: GomangoCuda]
#126930
09/28/08 10:34 AM
09/28/08 10:34 AM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Stratford nj
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Quote:
Quote:
i think the rpms are around 5200 at 80, this is with 4.30s
That can't be right unless your converter is slipping real bad or your tires are about 20" tall. Should be well over 100 MPH at 5200 rpm.
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the only other part that i didnt change was the flex plate. it is a b&m externally balanced pc. i didnt see any cracks and it didnt look to be bent. the converter holes lined up perfect also
Any chance it lost a balance weight?
thats why i said i think lol there are no weights on the converter. i just got the converter back from getting a freshening up too
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Re: vibration update on the cuda
[Re: cudadan]
#126935
09/28/08 12:14 PM
09/28/08 12:14 PM
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Anonymous
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Anonymous
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That B&M flexplate cold be it, I've had problems with mine and other people on this site have too. 
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Re: vibration update on the cuda
[Re: GomangoCuda]
#126936
09/28/08 12:20 PM
09/28/08 12:20 PM
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Joined: Jan 2003
Posts: 75,046
U.S.S.A.
JohnRR
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U.S.S.A.
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Quote:
Quote:
the only other part that i didnt change was the flex plate. it is a b&m externally balanced pc. i didnt see any cracks and it didnt look to be bent. the converter holes lined up perfect also
Any chance it lost a balance weight?
They don't add weight to them , they remove the required amount of weight 180* off from where you need to add the weight to get the desired result .
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Re: vibration update on the cuda
#126937
09/28/08 12:20 PM
09/28/08 12:20 PM
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Joined: Jan 2003
Posts: 75,046
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,046
U.S.S.A.
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Quote:
That B&M flexplate cold be it, I've had problems with mine and other people on this site have too.
Good point Mike , I'd take the flexpalte to a machine shop and have it checked .
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Re: vibration update on the cuda
[Re: B1HEAD_USER]
#126941
09/28/08 12:38 PM
09/28/08 12:38 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
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Posts: 2,617
Stratford nj
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Quote:
Are the input and output shaft in the trans the same or were they changed? I have a friend that had a vibration problem with his chevy. It turned out to be a slighly bent input shaft in the trans. Next time the trans is apart put the shafts between centers and check them.
they both have been changed, the only thing thats the same is the housing itself, even changed the tail housing
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Re: vibration update on the cuda
[Re: cudadan]
#126942
09/28/08 01:05 PM
09/28/08 01:05 PM
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Joined: Jan 2003
Posts: 8,028
Tulsa OK
Bad340fish
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Tulsa OK
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Bust your u-bolts loose and check the spring perches. I had one come loose on mine. After putting in a new driveshaft and fixing the sprag I drove the car and it drove like crap. However, everything passed the visual check. The weld had a hairline on it that didn't look like anything. Removing the u-bolts showed it was busted completly loose from the housing. Could be your pinion angle is going wild when going down the road, and returns to normal when under no load(due to a busted perch).
Would be an easy check before pulling the trans.
68 Barracuda Formula S 340
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