Marty C Posted October 27 Report Share Posted October 27 My 1952 Dodge Coronet with a perfectly working GyroMatic vibrates pretty severely when coming to a stop. Engine runs smooth as silk and quiet too so I know it’s not the engine. When I stop and it is vibrating , it will completely stop if I depress the clutch! There is no vibrating when accelerating , driving or coasting. Only comes in as soon as the car stops. As soon as I start moving , smooths out Any ideas? my guess fly wheel or clutch but I’m not too familiar with clutches or flywheels!! Any help would be appreciated Quote Link to comment Share on other sites More sharing options...
joecoozie Posted October 27 Report Share Posted October 27 Transmission and motor mount(s) Quote Link to comment Share on other sites More sharing options...
greg g Posted October 27 Report Share Posted October 27 IF you shift manually to neutral is there any change? Is it a Hi or lo frequency vibration? What is the state of your drive shaft/u joints? Have you ruled out exhaust banging? I had a pipe contacting that passenger side under floor heat shield. ? . 1 Quote Link to comment Share on other sites More sharing options...
Marty C Posted October 28 Author Report Share Posted October 28 All motor mounts are new its a pretty decent vibration that rattles the windows cant be the drive shaft its just when its in “drive” and stopped!! Quote Link to comment Share on other sites More sharing options...
Roofus Posted October 28 Report Share Posted October 28 (edited) Quote its just when its in “drive” and stopped!! So it's linked to the hydraulic coupler Edited October 28 by Roofus Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 28 Report Share Posted October 28 6 hours ago, Marty C said: All motor mounts are new New made motor mounts are a crap shoot. Seen them fail fairly quick. I usually end up going with US made polyurethane mounts, if they are available for the application. If not, there are several companies that will rebuild yours. Might want to see if you can replicate the issue in the garage and inspect. 1 Quote Link to comment Share on other sites More sharing options...
Marty C Posted October 28 Author Report Share Posted October 28 I agree with you however the vibration comes in and out with such precise timing , that’s the real confusing thing for me! if the motor mounts are bad wouldn’t there be other times there would be vibrations? the vibration starts as soon as the car comes to a stop, and the vibration disappears as soon as it starts moving!!!! I just don’t understand it! Quote Link to comment Share on other sites More sharing options...
Sniper Posted October 28 Report Share Posted October 28 That's because your transmission has a load on it when you're stopped it doesn't have when you're moving. It's kind of like an automatic when you put it in gear it'll twist a little bit. Soon as you step on the clutch you're disconnecting the output of the engine from the input of the transmission and that load goes away and it quit so your transmission is moving 1 Quote Link to comment Share on other sites More sharing options...
Marty C Posted Monday at 03:52 AM Author Report Share Posted Monday at 03:52 AM Sniper that’s exactly the issue what do you think it could be? motor mounts like everyone is saying? Quote Link to comment Share on other sites More sharing options...
Roofus Posted Monday at 07:31 AM Report Share Posted Monday at 07:31 AM Could a lack of oil in the coupler cause an imbalance? Quote Link to comment Share on other sites More sharing options...
Marty C Posted Monday at 03:53 PM Author Report Share Posted Monday at 03:53 PM This problem has been an issue since I installed a new engine and topped off fluids in the converter and the transmission so I don’t think so …but I just don’t know Quote Link to comment Share on other sites More sharing options...
Marty C Posted Monday at 03:54 PM Author Report Share Posted Monday at 03:54 PM (edited) My personal feels are maybe the clutch tho I feel no chattering in the pedal and there are no problems with the clutch that I know of Edited Monday at 03:55 PM by Marty C Because I added a few extra words….why do you need a reason for an edit??? Quote Link to comment Share on other sites More sharing options...
JerseyHarold Posted Monday at 03:57 PM Report Share Posted Monday at 03:57 PM Just a wild-assed guess, but have you checked that the emergency brake is properly installed and adjusted? Quote Link to comment Share on other sites More sharing options...
Marty C Posted Monday at 04:05 PM Author Report Share Posted Monday at 04:05 PM It’s never been out but I inspected shoes when I swapped out a bad drive shaft. The shoes were fine and I adjusted them and they hold the car great! Quote Link to comment Share on other sites More sharing options...
Roofus Posted Monday at 05:08 PM Report Share Posted Monday at 05:08 PM If you accelerate hard in 3 by preventing the car from advancing by the brake on the foot, vibrations also decrease ? Quote Link to comment Share on other sites More sharing options...
Marty C Posted Monday at 07:27 PM Author Report Share Posted Monday at 07:27 PM I’m guessing you mean try power braking it? never tried it but I’m guessing the vibration would get less the engine needs to be running really slow for it to shift properly , I’ve tried raising idle vibration is less but then it doesn’t shift right Quote Link to comment Share on other sites More sharing options...
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