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Re: vibration update on the cuda
[Re: cudadan]
#127044
11/29/08 06:37 PM
11/29/08 06:37 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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well i put my manual valve body in the trans and now it goes through all the gears nice, BUUUUUUUUT i still have a vibration, lets see 3 trannys, 6 drive shaft's, billet yoke, 3 center sections, 3 set of axles, pinion angle has been changed 10x's. 2 sets of tires and wheels, and another set of brake drums, probably 20 u joints., bushings are all in great shape, no cracks in the frame, new tranny mount, motor mounts. this is vibrating without the axles in the rear, sooooo what do i @^&^%$#& do now?
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Re: vibration update on the cuda
[Re: smokinwoody]
#127046
11/29/08 07:08 PM
11/29/08 07:08 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:
gotta be in the engine somewhere...you've done everything else but change the axle housing...could that have a slight bend?
it could have a bend but i wasnt sure with running it without the axles that it would vibrate, i am at a total loss here
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Re: vibration update on the cuda
[Re: superwrench]
#127048
11/30/08 05:50 AM
11/30/08 05:50 AM
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Joined: Jan 2003
Posts: 2,697
Renton Wa
topfueldart
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Renton Wa
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Quote:
What converter is in it now? the stock one or your good one? What about running it with the converter unbolted, are you absolutely sure there is no engine vibration. I thought the B&M plate with the section missing was for a 360 with weight on the converter but You had a balanced converter did you not?
There is no way to start the car if the flexplate is unhooked... the starter spins the converter, not the flexplate, unfortunately we arent chevy boys in this aspect...
On page 3 you said you tested the car with the driveline removed and it was smooth as glass, and that it had to be behind that, so why did you rip the trans out of the car to try this other one?
Also, you asked about the measurement side to side of the driveline in the car, and the motor, trans, and drivelines in our cars are all offset about 1 3/4 inch, for the steering column and gear, thats how they came factory, so I dont think thats an issue...
Heres how I diagnose it...
If its REALLY only in 3rd gear, and it changed RPM/speed with all 3 chunk swaps, then its a drivetrain RPM issue, and not an engine RPM issue, so it CANNOT be motor, flexplate, converter, front pump, or input shaft related... its gotta be in the back of the trans rearward...
If it REALLY went away without the driveline in the car, that proves all of that as well, unfortunately it doesnt really rule out the back of the trans, because if the output bushing were worn, then maybe the weight and force of the driveline is straining the trans causing the issue, but since youve had several trannys in the car, i dont think thats the issue..
You probably didnt get MULTIPLE bad drivelines, and u-joints, and you have tested the car without the wheels and brakes, and tried different gear sets with no difference either, so your really running out of possible options here..
SOOOOO pretty much the only thing left is:
Rear end could be installed crooked or bent, maybe the spring mounts, or the whole housing is tweaked or something, causing the u joint to bind, and causing the vibration. your car leave pretty hard, so its probably taken a beating, maybe you should backbrace the next one. Are the U-bolts tight? Those are the only things I think would follow the logic of everything you have said, and explain the issue.
Dont know what else to say man, there is alot of conflicting issues in the thread, and it gets hard to comprehend it all... I think your on the right track trying the rear end next, but if that doesnt fix it, i say just beat on it until something breaks, these old mopars are weird sometimes, it could go on for years lol
Good luck.
11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.
9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
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Post deleted by Defbob
[Re: topfueldart]
#127049
11/30/08 08:53 AM
11/30/08 08:53 AM
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Anonymous
Unregistered
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Anonymous
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Re: vibration update on the cuda
[Re: MoparDonny]
#127052
11/30/08 05:50 PM
11/30/08 05:50 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
master
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Posts: 2,617
Stratford nj
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Quote:
Dan, If you've had it with trying to figure this out, I'll Gladly give you a flat of Kokanee for the car. 
Whatcha think? 
I'LL TAKE IT LOL
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Re: vibration update on the cuda
[Re: topfueldart]
#127053
11/30/08 05:53 PM
11/30/08 05:53 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
master
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OP
master
Joined: Aug 2003
Posts: 2,617
Stratford nj
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Quote:
Quote:
What converter is in it now? the stock one or your good one? What about running it with the converter unbolted, are you absolutely sure there is no engine vibration. I thought the B&M plate with the section missing was for a 360 with weight on the converter but You had a balanced converter did you not?
There is no way to start the car if the flexplate is unhooked... the starter spins the converter, not the flexplate, unfortunately we arent chevy boys in this aspect...
On page 3 you said you tested the car with the driveline removed and it was smooth as glass, and that it had to be behind that, so why did you rip the trans out of the car to try this other one?
Also, you asked about the measurement side to side of the driveline in the car, and the motor, trans, and drivelines in our cars are all offset about 1 3/4 inch, for the steering column and gear, thats how they came factory, so I dont think thats an issue...
Heres how I diagnose it...
If its REALLY only in 3rd gear, and it changed RPM/speed with all 3 chunk swaps, then its a drivetrain RPM issue, and not an engine RPM issue, so it CANNOT be motor, flexplate, converter, front pump, or input shaft related... its gotta be in the back of the trans rearward...
If it REALLY went away without the driveline in the car, that proves all of that as well, unfortunately it doesnt really rule out the back of the trans, because if the output bushing were worn, then maybe the weight and force of the driveline is straining the trans causing the issue, but since youve had several trannys in the car, i dont think thats the issue..
You probably didnt get MULTIPLE bad drivelines, and u-joints, and you have tested the car without the wheels and brakes, and tried different gear sets with no difference either, so your really running out of possible options here..
SOOOOO pretty much the only thing left is:
Rear end could be installed crooked or bent, maybe the spring mounts, or the whole housing is tweaked or something, causing the u joint to bind, and causing the vibration. your car leave pretty hard, so its probably taken a beating, maybe you should backbrace the next one. Are the U-bolts tight? Those are the only things I think would follow the logic of everything you have said, and explain the issue.
Dont know what else to say man, there is alot of conflicting issues in the thread, and it gets hard to comprehend it all... I think your on the right track trying the rear end next, but if that doesnt fix it, i say just beat on it until something breaks, these old mopars are weird sometimes, it could go on for years lol
Good luck.
my 360 is externally balanced so i need the flexplate with the half moon cut out of it. i hope i can finish up my other rear this week so i can eliminate that, then its gonna be leaf springs i guess. after the the only thing that wasn't changed would be the motor, which i dont think thats the problem but ya never know with a vibration. i would drive it till something breaks but the ujoints fail before anything else will lol
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Re: vibration update on the cuda
[Re: joshking440]
#127055
12/01/08 08:15 PM
12/01/08 08:15 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:
Is it the Damper????
Could you get an externally balanced flywheel from an old truck???
i had the stock one on for about 5 yrs, then i bought an SFI one with no change either 
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Re: vibration update on the cuda
[Re: RemCharger]
#127058
12/01/08 09:45 PM
12/01/08 09:45 PM
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Joined: Aug 2003
Posts: 2,617
Stratford nj
cudadan
OP
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Stratford nj
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Quote:
I've hurt my brain a fair bit on this too. I would start with the fact that it eats rear u joints. could a guy put a pipe in the rear yoke and see how parallel it is with the car? I would think that would solve that question. next do you have an adjustable pin snubber? try preloading it and driving see if it changes. I think its in the shaft to rear end angle.  
i just finished up sandblasting my other rear housing, then its off to powder coating, tomorrow i had to move the pearches in .800 for the offset shackel. and should have it ready to go my car monday., i do have an adj pinion snubber, but do you think that on jackstands with NO axles in the car that there would be any strain or stress anywhere., its at 1800 rpms @35mph is where i feel it. then it goes away between 45 to about 75 then it comes back.  i checked the wheel base and its only 1/8" different from driver to passenger side..
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Re: vibration update on the cuda
[Re: WilliamHall]
#127060
12/02/08 05:59 PM
12/02/08 05:59 PM
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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:
Is it the same torque convertor you had before and after the vibration problem happened?
yes it is, but i had it sent out to get freshened up , then it got rebalanced
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Re: vibration update on the cuda
[Re: MoparDonny]
#127062
12/03/08 09:03 PM
12/03/08 09:03 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:
So Dan  Where ya gonna start lookin from here? Almost time to hire a Vibration Analyst.
Don.
lmao, not sure yet maybe a for sale sign hahah. i just finished up my new rear,( 8 3/4) had to move the pearches in. now its ready for powder coating, i should get it back monday or tuesday, then i drop that in and see
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Post deleted by Defbob
[Re: cudadan]
#127063
12/03/08 09:36 PM
12/03/08 09:36 PM
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Anonymous
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