Tranny Cover vibrations
#2982466
11/06/21 05:15 PM
11/06/21 05:15 PM
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Joined: Apr 2004
Posts: 3,653 The Historic Hudson Valley
MONC
OP
master
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OP
master
Joined: Apr 2004
Posts: 3,653
The Historic Hudson Valley
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So is it crappy repro transmission covers ( 727 small block 71) that are causing the insane vibrations as I drive or is something else the culprit?
I replaced the missing cover , tightened everything down, no missing bolts an drove the car , it was fine. Getting off the parkway and merging into traffic on road, I start hearing insane vibrations, so bad I think the transmission is about to blow. I gingerly drove it to my mechanic down the road (was going for an inspection). He put it on lift and started car, and it was definitely the cover making the god awful noise. All bolts were secure. Is the metal on the new covers just cheap and thin? My other 71 with same cover doesn't vibrate at all. Not sure if it is a repro or not.
Mopar Or No Car
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Re: Tranny Cover vibrations
[Re: stumpy]
#2982538
11/06/21 08:37 PM
11/06/21 08:37 PM
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Joined: Jan 2003
Posts: 20,149 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,149
Park Forest, IL
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Yes, I seem to remember some little fingers on the cutout by the crank hitting if they don't seat right.
"Everybody funny, now you funny too."
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Re: Tranny Cover vibrations
[Re: slantzilla]
#2982542
11/06/21 08:44 PM
11/06/21 08:44 PM
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Joined: Apr 2004
Posts: 3,653 The Historic Hudson Valley
MONC
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OP
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Joined: Apr 2004
Posts: 3,653
The Historic Hudson Valley
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You mean the 2 small bolts at the bottom that act as a cover for the smaller inspection plate? Was thinking about them as well. I was going to try and take them off first to see if that made a difference.
Mopar Or No Car
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Re: Tranny Cover vibrations
[Re: stumpy]
#2982548
11/06/21 09:08 PM
11/06/21 09:08 PM
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Joined: Jan 2003
Posts: 4,707 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,707
Moved to N.E. Tennessee
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Are the convertor bolts hitting the cover? This. Incorrect, bent or warped cover, cheap plastic cover, loose converter bolt, incorrect converter bolt. Correct converter bolts have thin heads and DO NOT use washers of any kind. Cracked or bent flex plate.
Last edited by GomangoCuda; 11/06/21 09:11 PM.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: Tranny Cover vibrations
[Re: AARCONV]
#2982642
11/07/21 09:55 AM
11/07/21 09:55 AM
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Joined: Apr 2004
Posts: 3,653 The Historic Hudson Valley
MONC
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OP
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Joined: Apr 2004
Posts: 3,653
The Historic Hudson Valley
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Its easy to tell if its the cover, remove it and check for wear...but then again it would of hit and make noise on 1st start up..its not like it bends later Exactly, not sure why it was fine for half the trip and then suddenly start vibrating. It didn't look cracked or anything when we inspected it on the lift. I'll get under there today and check it out, thanks.
Mopar Or No Car
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Re: Tranny Cover vibrations
[Re: GomangoCuda]
#2982848
11/07/21 05:28 PM
11/07/21 05:28 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
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bent or warped cover, cheap plastic cover, loose converter bolt, incorrect converter bolt. Correct converter bolts have thin heads and DO NOT use washers of any kind. Cracked or bent flex plate. Or the crank thrust bearing is severely worn.
The INTERNET, the MISinformation superhighway
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Re: Tranny Cover vibrations
[Re: MONC]
#2983004
11/08/21 02:47 AM
11/08/21 02:47 AM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Its easy to tell if its the cover, remove it and check for wear...but then again it would of hit and make noise on 1st start up..its not like it bends later Exactly, not sure why it was fine for half the trip and then suddenly start vibrating. It didn't look cracked or anything when we inspected it on the lift. I'll get under there today and check it out, thanks. I would remove the cover and look for a loose or missing converter bolt
Last edited by Cab_Burge; 11/08/21 02:47 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Tranny Cover vibrations
[Re: Cab_Burge]
#2983355
11/09/21 10:16 AM
11/09/21 10:16 AM
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Joined: Apr 2004
Posts: 3,653 The Historic Hudson Valley
MONC
OP
master
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OP
master
Joined: Apr 2004
Posts: 3,653
The Historic Hudson Valley
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Its easy to tell if its the cover, remove it and check for wear...but then again it would of hit and make noise on 1st start up..its not like it bends later Exactly, not sure why it was fine for half the trip and then suddenly start vibrating. It didn't look cracked or anything when we inspected it on the lift. I'll get under there today and check it out, thanks. I would remove the cover and look for a loose or missing converter bolt I removed the cover, didn't see any noticeable wear, and it wasn't cracked or anything. I will check the converter bolts, good idea .
Mopar Or No Car
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Re: Tranny Cover vibrations
[Re: mopars4ever]
#2983568
11/09/21 06:29 PM
11/09/21 06:29 PM
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Joined: Apr 2004
Posts: 3,653 The Historic Hudson Valley
MONC
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OP
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Joined: Apr 2004
Posts: 3,653
The Historic Hudson Valley
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Didn't make sense for me to shim the lower bolts, especially on a brand new cover, but glad it helped. If I put it back on, I'll see if that makes a difference
Mopar Or No Car
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