thomasrc
Member
I am verifying all of this has been attempted - the mechanic did get it to shift on the road last week, once he turned around to come back, it no longer shifted.
ANY HELP is greatly, greatly appreciated!
The following was posted on BaT:
Using a Firefox Duck Duck Go query “1948 chrysler m6 will not shift from 3rd to 4th after letting up on gas“, I found the following site “https://forums.aaca.org/topic/383942-c38-chrysler-1948-windsor-transmission-issue/“.
I am copying from this site a relevant section for you written by Rusty_OToole (I want Mr. O’Toole to get full credit for the following list of things to look at on your 48 Windsor)
1. It could be low on oil. The transmission is filled separate from the Fluid Drive unit. The transmission will not shift if it is low on oil.
2. Could also be a loose or frayed wire somewhere. Check the wires from the transmission to the carburetor, and from the carburetor to the ignition coil.
3. It is possible the contact points in the governor are dirty. If that happens the trans will not shift down when you stop the car. You can take the top off the governor and clean the points. Be careful, they are made of silver and are not as hard as ignition points or relay points. Use contact cleaner spray, or brake cleaner spray to remove grease and drag a strip of white typing paper between the points until it comes out clean.
4. If the idle speed is too high the trans will not shift. Idle speed should be very low, 400 RPM, about half the speed of a modern car.
Those are the most common causes of not shifting.
ANY HELP is greatly, greatly appreciated!
The following was posted on BaT:
Using a Firefox Duck Duck Go query “1948 chrysler m6 will not shift from 3rd to 4th after letting up on gas“, I found the following site “https://forums.aaca.org/topic/383942-c38-chrysler-1948-windsor-transmission-issue/“.
I am copying from this site a relevant section for you written by Rusty_OToole (I want Mr. O’Toole to get full credit for the following list of things to look at on your 48 Windsor)
1. It could be low on oil. The transmission is filled separate from the Fluid Drive unit. The transmission will not shift if it is low on oil.
2. Could also be a loose or frayed wire somewhere. Check the wires from the transmission to the carburetor, and from the carburetor to the ignition coil.
3. It is possible the contact points in the governor are dirty. If that happens the trans will not shift down when you stop the car. You can take the top off the governor and clean the points. Be careful, they are made of silver and are not as hard as ignition points or relay points. Use contact cleaner spray, or brake cleaner spray to remove grease and drag a strip of white typing paper between the points until it comes out clean.
4. If the idle speed is too high the trans will not shift. Idle speed should be very low, 400 RPM, about half the speed of a modern car.
Those are the most common causes of not shifting.
