Pulsing Vibration
#2168034
10/04/16 10:35 PM
10/04/16 10:35 PM
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Joined: Jun 2004
Posts: 935 Elizabethtown, KY
6T9Hemi
OP
super stock
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OP
super stock
Joined: Jun 2004
Posts: 935
Elizabethtown, KY
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My car is making a pulsing vibration under steady acceleration in drive only. Does not do it in 1st or 2nd. 340 with torqueflite. Not there when coasting, only under acceleration and only in Drive. Could it be the torque convertor or driveshaft out of balance? This is a good one.? ? ? ?
1969 340 4 Speed Swinger R4, black vinyl, white butt stripe, 3:91
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2168050
10/04/16 10:56 PM
10/04/16 10:56 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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same load (in hg) for the steady accelleration in all gears but acting up in Drive only? Everything as far as you know is the same? WAG, slight fuel starvation. EDIT or tire/wheel balance/wheel bearing issue, loose etc
Last edited by RapidRobert; 10/04/16 10:59 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Pulsing Vibration
[Re: stumpy]
#2168064
10/04/16 11:10 PM
10/04/16 11:10 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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Do you feel it in your hands or your butt? TMI TMI TMI TMI TMI
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Pulsing Vibration
[Re: stumpy]
#2168070
10/04/16 11:15 PM
10/04/16 11:15 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Do you feel it in your hands or your butt? My tire man asked me that when I was tracking down a vibration. turned out to be a front ujoint getting ready to let go (& it did)
live every 24 hour block of time like it's your last day on earth
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2168130
10/05/16 12:49 AM
10/05/16 12:49 AM
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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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Has the rear suspension been updated or altered in any way? Incorrect pinion angle will cause a harmonic (pulsing) vibration if the u-joints are not properly phased.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Pulsing Vibration
[Re: stumpy]
#2168151
10/05/16 01:14 AM
10/05/16 01:14 AM
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Joined: Jun 2004
Posts: 935 Elizabethtown, KY
6T9Hemi
OP
super stock
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OP
super stock
Joined: Jun 2004
Posts: 935
Elizabethtown, KY
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Butt. It's like I'm sitting on top of the vibration. I already replaced U joints.
1969 340 4 Speed Swinger R4, black vinyl, white butt stripe, 3:91
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2168195
10/05/16 03:37 AM
10/05/16 03:37 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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too much shaft end play causing not enough front yoke spline engagement in the trans (I had that causing a vibration for me once). worn extension housing bushing. worn trans mount. throwing out potentials.
live every 24 hour block of time like it's your last day on earth
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Re: Pulsing Vibration
[Re: RapidRobert]
#2168248
10/05/16 10:25 AM
10/05/16 10:25 AM
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Joined: Jun 2004
Posts: 935 Elizabethtown, KY
6T9Hemi
OP
super stock
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OP
super stock
Joined: Jun 2004
Posts: 935
Elizabethtown, KY
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What is the correct length for the driveshaft in a 69 GTS 340 auto?
1969 340 4 Speed Swinger R4, black vinyl, white butt stripe, 3:91
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Re: Pulsing Vibration
[Re: stumpy]
#2168373
10/05/16 02:18 PM
10/05/16 02:18 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What Stump said, you may be OK on that dimention as is. (have it loaded)
live every 24 hour block of time like it's your last day on earth
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2168427
10/05/16 03:45 PM
10/05/16 03:45 PM
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Joined: Jun 2004
Posts: 935 Elizabethtown, KY
6T9Hemi
OP
super stock
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OP
super stock
Joined: Jun 2004
Posts: 935
Elizabethtown, KY
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Is there any way that it could be the torque convertor balance? You are basically at a 1 to 1 ratio in drive. Could I be feeling an out of balance convertor in drive where the vibration is lost in first and second.
1969 340 4 Speed Swinger R4, black vinyl, white butt stripe, 3:91
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2168486
10/05/16 05:20 PM
10/05/16 05:20 PM
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Joined: Jan 2003
Posts: 75,043 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Convertor out of balance will be out of balance in all gears ... and in neutral .... moving or standing still ...
running up my post count some more .
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2168567
10/05/16 07:30 PM
10/05/16 07:30 PM
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Joined: Apr 2003
Posts: 348 Texas Hill Country
Centerline
enthusiast
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enthusiast
Joined: Apr 2003
Posts: 348
Texas Hill Country
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If it wasn't acting up before you had the "U" joints replaced, THAT is the first place to look and most likely culprit provided that nothing else was messed with.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Pulsing Vibration
[Re: 6T9Hemi]
#2170267
10/08/16 01:35 PM
10/08/16 01:35 PM
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Joined: Jan 2003
Posts: 13,601 md
mopars4ever
I Live Here
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I Live Here
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Posts: 13,601
md
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