700r4 knocking in P and N - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-22-2010, 02:01 PM
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700r4 knocking in P and N

Hello everybody,

I have a 1991 caprice classic with 305 engine ( around 80 000 miles ) and in this summer I have lost a reverse on my 700r4. Transmission has been rebuilt a month ago and everything is fine now except one thing. Now I hear a knocking sound when transmission is in N and position P. It's pretty loud sound like someone is banging on the metal with a hammer. When I shift into gear D or R this noise disappears or it gets really really quiet. What can this be ?? Is it pump, converter? Is it harmful to drive a car in this condition ?

Thank you in advance!

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Old 11-22-2010, 03:32 PM
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Quote:
Originally Posted by Bennylava
Hello everybody,

I have a 1991 caprice classic with 305 engine ( around 80 000 miles ) and in this summer I have lost a reverse on my 700r4. Transmission has been rebuilt a month ago and everything is fine now except one thing. Now I hear a knocking sound when transmission is in N and position P. It's pretty loud sound like someone is banging on the metal with a hammer. When I shift into gear D or R this noise disappears or it gets really really quiet. What can this be ?? Is it pump, converter? Is it harmful to drive a car in this condition ?

Thank you in advance!
Loose converter bolts, loose flywheel bolts, or cracked flywheel. Given that this is a recent rebuild, my money is on loose converter bolts.
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Old 11-22-2010, 03:49 PM
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All of the above plus check mounting bolts to engine and anything else that was unbolted!
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Old 11-23-2010, 03:15 AM
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Thank you for your answers,but can you explain why is it knocking that loud only in P or N?
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Old 11-23-2010, 03:21 AM
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Thank you for your replies,but can you explain me why is it that loud only in P and N. Just to mention that converter hasn't been replaced on a recent rebuild.
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Old 11-23-2010, 05:43 AM
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When you are in gear, there is pressure against those bolts....When in P or N, there isnt, so they can rattle around easier
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Old 11-23-2010, 02:01 PM
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Thank you for explanation and answers! You have been very helpful!
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