MATT44

Thanks to all very helpful 

Matt44

On 6/22/2018 at 9:54 PM, Mike36 said:

You do not need an overdrive unit. You need a transmission with attached overdrive. Overdrive cannot be added to your transmission. 1935 thru 1939 will work from a Chrysler or Desoto. If using a 1939 unit, the top cover and shifter from your 1937 transmission will have to be installed on it. Your driveshaft will need to be shortened as the overdrive transmission is longer. This is a fairly simple bolt in change. Be aware, these are mechanical overdrives without a kick down solenoid. Vehicle must be slowed to around 35 mph to go out of overdrive. You must have parking brake in good working condition when you have an overdrive transmission.

 

 

I am looking to purchase a 1937 Plymouth Sedan that has a stock 3 speed manual transmission with the (top loader) shifter on the floor.

I heard that you can only add an overdrive to this car if it has a steering column shifter.  Does anyone know if I can add a overdrive unit and where I might find 

that overdrive unit?