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Need Help with Gyro-Matic Transmission


grassfiddler

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  • 2 years later...

How about my trans upshifts and downshifts just before coming to a stop. I cannot get it to do a forced downshift. What do I need to check? What are the correct procedures to troubleshoot? Thanks Dan. 1950 coronet gyromatic trans

Edited by Redneck Coronet
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I just went through this with my setup - no forced downshift.  After checking everything, I found that the throttle linkage needed to be tightened up, so that it would fully depress the switch in the carburetor when the pedal is fully depressed.  

 

You can put a multi-meter to the carb switch to see that the switch completes the circuit to ground when the pedal is to the metal.  

 

(Added:)  Don't just push the button at the carb.  Floor the pedal with the test meter visible.    

Edited by DonaldSmith
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  • 4 weeks later...

Update. Totally rewired the trans harness. I now have good upshifts and downshifts. Kickdown switch works. Now all I need is to get a tach to work on neg grnd and chart rpms. I have had it up to 70 in 4 but sounds like high revs. Smooth power and pulls real strong. Tried a sun tach using a bucking transformer but rpms read 500 to 600 higher than a hand held.

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It should be in the 2800 to 3200 range,  by what you are used to today where most cars run along at 70 at just over 2000, it is a sound you are not used to.  Add in fan noise, lack of sound insulation, and driving with windows open you have a barrage of sounds you are not used to.  

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