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727tf vibrates in neutral #2750299
03/08/20 10:18 PM
03/08/20 10:18 PM
Joined: Feb 2020
Posts: 22
BRIDGEWATER
T
Tr jimi Offline OP
member
Tr jimi  Offline OP
member
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Joined: Feb 2020
Posts: 22
BRIDGEWATER
Hi ,
Has anyone encountered a cyclical vibration that starts at 2000rpm and up in a late 70"s 727. can feel it free revving in Park and also above 50 mph .
I know its not in the engine , last month the car had a 904 that was perfectly smooth and I'm using the same balanced factory 360 magnum flexplate with both transmissions.( both T/C are Neutral balanced )

Could I have some sort of drum wobble? which bushing could wear that could cause this even in Neutral?


Or is it more likely my brite red parts store Remanufactured torque convertor thats causing the imbalance ?

Thanks for your answers Jim

Re: 727tf vibrates in neutral [Re: Tr jimi] #2750982
03/11/20 12:32 PM
03/11/20 12:32 PM
Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
superwrench Offline
master
superwrench  Offline
master

Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
I'm putting money on that converter. Any wear inside the transmission would not cause vibration....that converter is not balance correctly .

Re: 727tf vibrates in neutral [Re: superwrench] #2751009
03/11/20 02:09 PM
03/11/20 02:09 PM
Joined: Jan 2003
Posts: 1,599
westerly, ri. usa
4
440lebaron Offline
pro stock
440lebaron  Offline
pro stock
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Joined: Jan 2003
Posts: 1,599
westerly, ri. usa
most likely convertor, compare each check for balance weights cast/forged crank on convertor


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Re: 727tf vibrates in neutral [Re: 440lebaron] #2751013
03/11/20 02:14 PM
03/11/20 02:14 PM
Joined: Dec 2005
Posts: 11,408
Fulton County, PA
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CMcAllister Offline
Mr. Helpful
CMcAllister  Offline
Mr. Helpful
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Joined: Dec 2005
Posts: 11,408
Fulton County, PA
Very little "stuff" in the trans turning while in park. Compare the new converter to the old one as far as external weights attached.


If the results don't match the theory, change the theory.






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