r10 / r11 transmissions

[pflaming]

Question: Do these interchange? Can I remove an r10 and install an r11 bolt for bolt? 

[pflaming]

Well, here are the answers to the above questions. Both of these are mine. The r10 is sold. The r11 is a large transmission for the straight 8 cars. I do not recall where I got it. But will sell it. 

[pflaming]

A better shot of the r10 and the r11 side by side. 

[kencombs]

The r10 and r11 designations are only for the OD.  They were available on a wide range of transmissions.  I don't think your transmission with the r11 on it is from the early flathead era.  The Main drive gear splines look like a 23 spline and much shorter than the 40-50s version.  I'm using an a833OD on my truck and it uses that MDG.  It is from an 80s van and attached to a 60 truck clutch housing.

 

Your 'r11' looks to be attached to a Borg Warner T85, judging by the curved side cover.  If the bolt pattern on the front is like the other one, it is probably from the 60s, a big car or PU.

[pflaming]

Ken, you have keen eye!

[Dodgeb4ya]

That R11 OD was used in the 1949-50 big eight Packards according to National Data.

[pflaming]

Since the overdrive I an “addition “ to a standard transmission, and since I have a standard three speed, I wonder if the r11 will attach! Too busy working to finish the Suburban now, but later, maybe. 
 

[kencombs]

It will only work on a different case IF the transmission is the same model.  The input shaft to the OD unit must replace the output of the transmission.  In your case, the transmissions are not the same.