Dontlikedynaflow Posted April 2, 2020 Share Posted April 2, 2020 (edited) who is the Dynaflow Man or Woman ? My 58 Buick Special has a weird problem. When its started from cold it will not move in "D" DRIVE but will in "L" Low and Reverse. When the car is warmed right up it then works fine all day until I switch it off and leave it over night then its the same again. I have a feeling its something minor and need to find out before I have it rebuilt. Any body had this problem? Edited April 2, 2020 by Dontlikedynaflow (see edit history) Link to comment Share on other sites More sharing options...
old-tank Posted April 2, 2020 Share Posted April 2, 2020 What does the trouble shooting section of your service manual say about the problem? 1 Link to comment Share on other sites More sharing options...
avgwarhawk Posted April 2, 2020 Share Posted April 2, 2020 Appears to be loosing prime after sitting. Fluid level where it needs to be? Link to comment Share on other sites More sharing options...
Dontlikedynaflow Posted April 3, 2020 Author Share Posted April 3, 2020 20 hours ago, avgwarhawk said: Appears to be loosing prime after sitting. Fluid level where it needs to be? So what causes this? Fluid level ok Link to comment Share on other sites More sharing options...
Dontlikedynaflow Posted April 3, 2020 Author Share Posted April 3, 2020 20 hours ago, old-tank said: What does the trouble shooting section of your service manual say about the problem? I dont have one for 58 Link to comment Share on other sites More sharing options...
Dontlikedynaflow Posted April 3, 2020 Author Share Posted April 3, 2020 Just now, Dontlikedynaflow said: I dont have one for 58 The 57 Manual doesnt list the fault ,only mentions no drive only Link to comment Share on other sites More sharing options...
avgwarhawk Posted April 3, 2020 Share Posted April 3, 2020 (edited) 2 hours ago, Dontlikedynaflow said: So what causes this? Fluid level ok Here is your manual online: https://www.hometownbuick.com/portfolio/1958-buick-chassis-service-manual/?portfolioCats=119 Prime can be lost due to excessive clearances in the front oil pump. In my case on a low mileage Dynaflow it was transmission fluid that was too thin(I performed a transmission service). It is to my understanding that transmission fluid in the 50's had a thicker viscosity then today's. In my case I drained a qt of the new transmission fluid and added a qt Lucas Transmission stop slip. It thickened the fluid. Has not lost prime since. Edited April 3, 2020 by avgwarhawk (see edit history) 3 1 Link to comment Share on other sites More sharing options...
60FlatTop Posted April 3, 2020 Share Posted April 3, 2020 Every two or three years I put a pint of Transex in mine and it pretty much takes car of it. If the wear in the pump exceeds the surface tension of the transmission fluid it will drain and lose prime. I have been thinking about rebuilding mine. I think the first time I thought about it was back in '02. I put it on the list of little annoying things my wife does. Things more trouble to fix than its worth. I saw the can of Lucas stuff at the parts store, but the charging system and lights were working fine. I didn't want to risk it. Bernie 1 3 Link to comment Share on other sites More sharing options...
old-tank Posted April 3, 2020 Share Posted April 3, 2020 Does the manual have procedures and values for checking pressures? This might pinpoint the problem area such as the valve body which could be addressed without removing the unit. Link to comment Share on other sites More sharing options...
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