Re: Why do Mopars vibrate??
[Re: 62maxwgn]
#529810
11/18/09 03:32 PM
11/18/09 03:32 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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If it vibrates, something needs to be fixed. My '67 Satellite, even at 3100 RPM with 3.91's out back, is very solid at freeway speeds.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529813
11/18/09 05:07 PM
11/18/09 05:07 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Quote:
Seems like every old mopar I ride or drive in, they just vibrate (sort of like worn out U-joints). My AAR does the same, and I hate the junker feeling it conveys when driving it...I replaced the u-joints, had the driveshaft balanced. Although better, it's still there. Just sitting (not moving) the steering wheel/column just resonates when running the engine through various speeds (i tried another factory harmonic damper)- still does it. Every time I talk about this with my friends, it seems like it's an accepted fact. I can't stand it anymore - other than the obvious, what are some things I can do to smooth my car out? I haven't touched the rearend (8 3/4), but I wonder if changing pinion/axle bearings is necessary? Thanks for any input!
Well, if it vibrates just sitting there, you can eliminate anything past the flywheel / torque convertor on the back side and you have already eliminated the balancer on the front side. That leaves: engine ( rotating assembly), flywheel or flexplate & torque convertor, unhealthy motor - includes partial miss or one cylinder down on compression or flat cam. Since it is the easiest to trouble shoot, I would proceed with the last item first ( verifying that the motor is healthy and hitting on all 8 holes evenly. In that regard, you might want to start with an rpm drop test. Next you might want to physically look at the flexplate and torque convertor for loose bolts / missing weights.
Fastest 300
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529814
11/18/09 08:01 PM
11/18/09 08:01 PM
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Joined: Feb 2004
Posts: 936
OLD318
super stock
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super stock
Joined: Feb 2004
Posts: 936
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Quote:
Seems like every old mopar I ride or drive in, they just vibrate (sort of like worn out U-joints). My AAR does the same, and I hate the junker feeling it conveys when driving it... Just sitting (not moving) the steering wheel/column just resonates when running the engine through various speeds... Every time I talk about this with my friends, it seems like it's an accepted fact. I can't stand it anymore - other than the obvious, what are some things I can do to smooth my car out?
Depending on your model year, you are in a 35-40 year old car. That's what they feel like... You are use to modern cars and there is no comparing them (fairly) to one another...
Regardless...
For mopars dated up until 1972 you have to remember that the steering gearbox bolts directly to a steel K frame which bolts directly to a steel frame. So there is NO isloation between tire vibration, engine vibration and the steering gearbox to steering column. The result is you feel everything with your hands on the column. And no set of tires/alignment/wheel balancing or sound proofing can fix this... Its the basic design.... and it is antiquated...
So no matter what you do, you cannot smooth out this feel in the steering wheel.
In 1973 (Take a charger for example)... The K frame gets isolated from the front sub frame, and the column gets isolated from the gearbox... this is a big improvement in terms of "feel" at the steering wheel. But it is still not on par with cars of today, where you feel almost nothing... in say a Camry or an Accord or just about any sizeable new car.
If you want to change the "old junker" feeling. I suggest you try a modern sound deadener. My recommendation would be a combination of 2 products Damplifier Pro followed by a layer of Luxury Liner Pro... This stuff installed inside your doors, your entire bare floor pan from backseat to front firewall AND the roof skin. As well as the trunk floor.
This will kill 80-90% of the sound/vibrations you hear and feel. You will be amazed at how solid the car will feel. But it will not correct 2 things... wind noise off of the front pillars/vent windows- which went away in 71-73 I believe, and that vibration you feel at the steering wheel.
Most mopar guys don't like this sound proofing stuff because it does add weight to the car and does not look factory especially in the trunk. It is also expensive and a little time consuming to put it.
However ,having done it... I would strongly recommend it... I was pleasantly surprised....
I have a 70 Coronet btw...
Best of luck to you!
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529815
11/18/09 08:03 PM
11/18/09 08:03 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Pure POWER!!!
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Re: Why do Mopars vibrate??
[Re: Crizila]
#529816
11/18/09 08:05 PM
11/18/09 08:05 PM
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Joined: Jan 2004
Posts: 9,066 Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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Quote:
Quote:
Seems like every old mopar I ride or drive in, they just vibrate (sort of like worn out U-joints). My AAR does the same, and I hate the junker feeling it conveys when driving it...I replaced the u-joints, had the driveshaft balanced. Although better, it's still there. Just sitting (not moving) the steering wheel/column just resonates when running the engine through various speeds (i tried another factory harmonic damper)- still does it. Every time I talk about this with my friends, it seems like it's an accepted fact. I can't stand it anymore - other than the obvious, what are some things I can do to smooth my car out? I haven't touched the rearend (8 3/4), but I wonder if changing pinion/axle bearings is necessary? Thanks for any input!
Well, if it vibrates just sitting there, you can eliminate anything past the flywheel / torque convertor on the back side and you have already eliminated the balancer on the front side. That leaves: engine ( rotating assembly), flywheel or flexplate & torque convertor, unhealthy motor - includes partial miss or one cylinder down on compression or flat cam. Since it is the easiest to trouble shoot, I would proceed with the last item first ( verifying that the motor is healthy and hitting on all 8 holes evenly. In that regard, you might want to start with an rpm drop test. Next you might want to physically look at the flexplate and torque convertor for loose bolts / missing weights.
You forgot motor or transmission mounts..
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Re: Why do Mopars vibrate??
[Re: 340dart4spd ]
#529818
11/18/09 08:57 PM
11/18/09 08:57 PM
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Joined: Mar 2006
Posts: 1,611 Pataskala, Ohio
GTX70sixpack
top fuel
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top fuel
Joined: Mar 2006
Posts: 1,611
Pataskala, Ohio
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Vintage cars do not transfer drivetrain vibrations like many are describing above unless there is an issue. You need to look at the engine mounts and the transmission mount. Sacked out mounts transfer a lot more vibration to the chassie. Another big culprit is the exhuast dead up agaist the frame, a torsion bar, the steering column etc; look for anything that is making solid contact.
My trans mount resently failed in my GTX when I was out thrashing on it pretty hard and it had a bad vibration at different rpm ranges in nuetral and a drone at highway speed (sounded like a out of balance drive shaft) dropped in a new poly mount and it's quiet and smooth again.
65 Belvedere II Station Wagon 69 Coronet R/T convertible 70 GTX 70'cuda 99 Dodge Diesel dually 4X4
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Re: Why do Mopars vibrate??
[Re: minivan]
#529819
11/18/09 09:45 PM
11/18/09 09:45 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Quote:
Quote:
Quote:
Seems like every old mopar I ride or drive in, they just vibrate (sort of like worn out U-joints). My AAR does the same, and I hate the junker feeling it conveys when driving it...I replaced the u-joints, had the driveshaft balanced. Although better, it's still there. Just sitting (not moving) the steering wheel/column just resonates when running the engine through various speeds (i tried another factory harmonic damper)- still does it. Every time I talk about this with my friends, it seems like it's an accepted fact. I can't stand it anymore - other than the obvious, what are some things I can do to smooth my car out? I haven't touched the rearend (8 3/4), but I wonder if changing pinion/axle bearings is necessary? Thanks for any input!
Well, if it vibrates just sitting there, you can eliminate anything past the flywheel / torque convertor on the back side and you have already eliminated the balancer on the front side. That leaves: engine ( rotating assembly), flywheel or flexplate & torque convertor, unhealthy motor - includes partial miss or one cylinder down on compression or flat cam. Since it is the easiest to trouble shoot, I would proceed with the last item first ( verifying that the motor is healthy and hitting on all 8 holes evenly. In that regard, you might want to start with an rpm drop test. Next you might want to physically look at the flexplate and torque convertor for loose bolts / missing weights.
You forgot motor or transmission mounts..
Did I mention checking motor and transmission mounts
Fastest 300
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529820
11/18/09 11:18 PM
11/18/09 11:18 PM
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Joined: Jul 2005
Posts: 757 Toronto, Ont, Canada
boydsdodge
super stock
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super stock
Joined: Jul 2005
Posts: 757
Toronto, Ont, Canada
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I totally hear what your saying, it is an in and out droning vib felt thru the car after 3500 rpm starting at 70 and up. On long drives where the speed limit is in the seventies it gets to be a real drag. I went thru my dart from front to rear all mounts complete front end rebuilt with bushings. Checked pinion angle, tires, new drive shaft after ballancing three. On this next build I have had the engine ballanced at a different shop hoping that might be the thing this time. I feel this same vib in lots of mopars from pick ups, vans, 4 speeds, autos, it seems to be small blocks from what I have noticed and cast cranks. mmmm, maybe something there.
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Re: Why do Mopars vibrate??
[Re: DennisH ]
#529822
11/19/09 09:09 AM
11/19/09 09:09 AM
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Joined: Jan 2003
Posts: 16,122 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
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if it comes and goes with road speed, usually at multiples of the first speed (say, 30mph smooths out, comes back at 60, etc) check pinion angle. excessive pinion angle (like the 5 degrees nose down recommended for drag racing) can cause vibrations at cruise.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529823
11/19/09 09:36 AM
11/19/09 09:36 AM
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Joined: Jul 2005
Posts: 1,954 Blairsden, CA
Triggerfish
top fuel
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top fuel
Joined: Jul 2005
Posts: 1,954
Blairsden, CA
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My Challenger rides smooth as can be. Only vibration is from my teeth when the elephant wakes up at a stop sign. But my car's totally redone. My bro's 69 Charger drives like a dream & the ride in his 68 GTX was perfect, too. But those cars were totally restored, too. Be sure to check your steering box/front suspension, bushings, spindles, brakes & tires old or out of balance. One wheel may be tweaked from hitting a curb? As was said, there's a lot that can cause vibration including tail shaft bushings, trans mounts, u joints, rear end/axles, drive shaft... I'd start w/ the tires, wheels, ball joints & bushings first. Good luck.
Last edited by Triggerfish; 11/19/09 09:37 AM.
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529825
11/19/09 10:00 AM
11/19/09 10:00 AM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Chryslers fix was to hang a big chunk of steel off the tailshaft on later automatic cars. Think I have one if you wanna try it.
Fastest 300
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Re: Why do Mopars vibrate??
[Re: Crizila]
#529826
11/19/09 12:06 PM
11/19/09 12:06 PM
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Joined: Jan 2003
Posts: 27,444 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,444
So Cal
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Quote:
Chryslers fix was to hang a big chunk of steel off the tailshaft on later automatic cars. Think I have one if you wanna try it.
I looked under a new mustang at the dealer and there's a bunch of chunks of steel under them. Also has a two piece driveshaft with CV type joints in it.
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Re: Why do Mopars vibrate??
[Re: boydsdodge]
#529828
11/19/09 02:57 PM
11/19/09 02:57 PM
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Joined: Dec 2008
Posts: 210 Denmark, Helsingor
AAR70
enthusiast
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enthusiast
Joined: Dec 2008
Posts: 210
Denmark, Helsingor
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Quote:
I totally hear what your saying, it is an in and out droning vib felt thru the car after 3500 rpm starting at 70 and up. .
What does that mean: in and out droning vibration?
Lau
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Re: Why do Mopars vibrate??
[Re: AAR70]
#529829
11/19/09 03:22 PM
11/19/09 03:22 PM
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Joined: Jan 2003
Posts: 5,442 Indiana
YO7_A66
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master
Joined: Jan 2003
Posts: 5,442
Indiana
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I have a vibration that starts around 70-75mph and gradually gets worse. Mine is from the rear wheels. When I had the shop install my tires, I was watching the machine as they spun up the wheel/tire assemblies. The tire was walking left to right as it was spinning. The guy told me that there is too much runout in two of the four wheels, so he told me to put these on the rear. He then told me that it should be ok up to 65-70 but above that is will start vibrating. All I can say is that he was correct. In my future I will be buying two new Rallyes and setting these two aside.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Why do Mopars vibrate??
[Re: GTX70sixpack]
#529831
11/19/09 04:45 PM
11/19/09 04:45 PM
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Joined: Nov 2004
Posts: 7,647 Houston Texas
PAINT IT BLACK
Got a CHIP on my shoulder
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Got a CHIP on my shoulder
Joined: Nov 2004
Posts: 7,647
Houston Texas
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Quote:
My trans mount resently failed in my GTX when I was out thrashing on it pretty hard and it had a bad vibration at different rpm ranges in nuetral and a drone at highway speed (sounded like a out of balance drive shaft) dropped in a new poly mount and it's quiet and smooth again.
Same thing happened to me a couple of years ago. Took me a while to piece it together, but sure enough... trans mount was bad. Much better now.
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Re: Why do Mopars vibrate??
[Re: boydsdodge]
#529835
11/20/09 06:29 AM
11/20/09 06:29 AM
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Joined: Jan 2003
Posts: 3,622 Millinocket, Maine
JonC
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Joined: Jan 2003
Posts: 3,622
Millinocket, Maine
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Quote:
Cruising down the highway about 3500 to 4000 usually, I will feel an all around vib that will come in and out , at that speed it will be like counting one thousand and one, one thousand and two, one thousand and three, etc... If I pick up speed it will just get closer together. 85 and up I just back off after short blasts because it sucks to feel it. If I am next to a Beemer or ricer I go for it not letting them know I am driving a cement mixer. lol. Did that help?
I have been fighting this with my 72 340 904 Cuda for some time now. I can get to 90 and it smooths out a lot. I haven't tried changing the rear tranny bushing and slip yoke as was suggested on one of my ealier posts on this. Will do that this winter and see if it helps.
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529840
11/20/09 06:22 PM
11/20/09 06:22 PM
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Joined: Nov 2009
Posts: 48 Los Angeles
Hazwoy
member
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member
Joined: Nov 2009
Posts: 48
Los Angeles
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I have the exact same problem as you!!! Only my car ran super great and smooth and developed the vibration you are talking about. I have owned this car for 6 years, 1972 Dodge Charger with rebuilt 1990 360 motor. 9:1 stock or small upgrade cam. Davis HEI Ignition, Holley street avenger carb. B&M Flexplate, Mopar performance 145K torque converter with neutral balance (no weight(s)). When torque converter was installed 5 years ago the shop had to knock off the weight to make converter neutral balance as B&M Flexplate s already balanced. Car ran smooth and strong for many years. 1 year ago I noticed a little vibration upon acceleration. Got progressively worse over the last year. Sure enough, tranny mount was bad but that stopped clunking , not vibration. Rebuilt carb, new plugs, verified timing, verified spark plug wire order. Car runs really strong but vibration still there. 18" vacuum at idle and needle rock solid so I cannot believe it is a tuning issue. I replaced harmonic damper with Summit Racing damper #163318 for external balance 360. My old damper looks exactly like Mopar Performance P5007301. If anything vibration may be worse. Then replaced motor mounts. A little smoother but vibration still bad. So bad now I only drive car to take it to get opinions from expert mechanics. For sure it is engine/balancing/torquue converter. Exact same smyptoms as Kielbasa's orginal post only mine have developed over time. Dash, steering wheel, and floor pan shake at anything above idle. Help!!! Thinking of rebuilding original damper but now I am getting into replace my new replacement parts...
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Re: Why do Mopars vibrate??
[Re: kielbasa]
#529842
11/21/09 01:17 AM
11/21/09 01:17 AM
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Joined: Oct 2004
Posts: 214
moparmandc
enthusiast
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enthusiast
Joined: Oct 2004
Posts: 214
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Quote:
Seems like every old mopar I ride or drive in, they just vibrate (sort of like worn out U-joints). My AAR does the same, and I hate the junker feeling it conveys when driving it...I replaced the u-joints, had the driveshaft balanced. Although better, it's still there. Just sitting (not moving) the steering wheel/column just resonates when running the engine through various speeds (i tried another factory harmonic damper)- still does it. Every time I talk about this with my friends, it seems like it's an accepted fact. I can't stand it anymore - other than the obvious, what are some things I can do to smooth my car out? I haven't touched the rearend (8 3/4), but I wonder if changing pinion/axle bearings is necessary? Thanks for any input!
look at accesorys on the engine (alt, waterpump, ect.) it is very often over lookedfor light (or heavy vibration in park). but many older cars just had some vibration, not as much isolation like newer cars they kind of evolved starting in the early 70's from being powerhouses to cruisers remember that it takes alot to have all the creature comfort in an old car that the newer ones have.
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Re: Why do Mopars vibrate??
[Re: moparmandc]
#529843
11/21/09 01:51 AM
11/21/09 01:51 AM
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Joined: Nov 2009
Posts: 9 Ontario , Canada
Purpleheart
member
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member
Joined: Nov 2009
Posts: 9
Ontario , Canada
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I have a AMC 71 AMX with a bad vibration . It actually cracked the bell housing of my 904 tranny . The motor and driveshaft were balanced , all new mounts , I'm using a 8 3/4 rearend and that's the only possibility left . There seems to be a lot of play in the pinion . The symptoms your describing sound very much like my problem . Do the Mopars with Dana 60 rearends have the same problems with vibration ?
Paul
71 AMX best time 11.97 @ 113 mph 1.71 60ft
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Re: Why do Mopars vibrate??
[Re: DennisH ]
#529844
11/21/09 08:52 AM
11/21/09 08:52 AM
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Joined: Dec 2004
Posts: 5,278 San Jose, California
DennisH
Vacation
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Vacation
Joined: Dec 2004
Posts: 5,278
San Jose, California
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Quote:
69 Coronet R/T. Keisler. Smooth. Sweet.
Got the USCartool subframe connectors, and firm feel box too. After riding in a co-workers 78 Corvette, the Coronet is a Cadillac. Dyno-Max turbos, no drone.
The 500 mile drive to Vegas is smooth and comfortable.
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