Does Mitchell Overdrive From 29CP Fit a 31CP
 

Hi All,
I recently bought a complete running gear minus the frame out of an 1929 Coupe and the rearend has a Mitchell overdrive. I want to install the overdrive in my 1931 Coupe. Will this unit fit the way it is or is there a difference in driveshaft lengths of where the actual Mitchell unit sits underneath the vehicle from year to year for the Coupe’s since there is two separate pieces of driveshaft?

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Can you not just measure both and compare?

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

all model As have the same length driveshaft,the entire rear interchanges

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

You’ll need a different speedometer cable extension, the u-joint housing may also be different, I’am not sure about a difference in the shifter

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

I understand that the length of the total driveshaft is the same. I am referring to the clearance of the metal gear box underneath the body of the car. I have never owned a 29 coupe so I just wanted to make sure that the metal box can sit in the same place under my 31 coupe body.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Best to call Steve Mitchell. He can hook you up with anything you may need.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

It should be a direct fit, neither body pans drop below the frame rails. Only the Victorias & possibly fordors with the dropped rear floor pan are different.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Talk to Steve at Mitchell, why guess at it. I would say that they make one that fits if it does require one (or if you already have one, the parts to convert it) (I would bet $1 it’s a direct bolt in)

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Different question along the same lines. Can I put an Extension onto my speedo cable just so I have a little more 'slack' in routing the cable? this is on a '29 Tudor

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

The speedometer cable must be driven by the Mitchell OD unit to correct for the ratio change in it. This is why it needs the extension. It is relatively long and any extra length would have to be coiled in a way that would still allow the inner core to rotate freely. Most model As have a length that is suited for the model year applicable. I've not seen one that didn't fit if properly routed.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Thank you all for your responses

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

To answer your question directly, yes. In fact, you could just swap the entire rear end if you really wanted to.

What you will find different is the speedometer drive for a 31 vs. 29. The 31 is a square end drive, the 29 has the flat end.

The other issue is the shifter mount bracket that holds the Mitchell shift lever. If you have an early 29 with the emergency brake in front of the shift lever, you will have a different bracket than the 31 uses.

Steve Mitchell can hook you up with the correct shifter mount bracket and speedometer drive cable. He is recovering from hip surgery at this moment (but doing very well!), so you may not get an immediate response.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Call Steve & Cindie Mitchell for the things you will need.

800-859-2088
530-458-4500

They are in Colusa, CA

Tom Endy

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

I called him on Monday and left a message. Within an hour he responded. I have a regular Mitchell OD in a box waiting for another A that needed an OD. I was looking at a Vickie and he said that I would need to convert both the input and output shaft and outside tube to avoid the OD hitting the floor pan. There would be a cost for the parts but not too much. Return on the unused parts. I could do the work myself. No 8 month wait for the parts. He needs a few more people working there.


Vic

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

I don't remember but I think the Mitchell takes a different cable end fitting than the Model A. If it is the same as a Model A, the AA's have longer cables.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

I spoke to Steve Mitchell and he said everything should fit except the speedo cable and gear. I ordered the correct speedo cable and gear from him. Thank you everyone.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

Glad to hear Steve’s hip surgery went well. Thanks for passing that along, Paul.

He and Cindy are truly dear people, the hobby is well served to have them in it.

Re: Does Mitchell Overdrive From 29CP Fit a 31CP
 

back on the extended Speedo cable, could I use the Model AA Truck cable from Snyders?