Granny four speed to 700R4 swap

[SteveRay]

The driveshaft on this thing has a flange on the back of the trans where the driveshaft fits, what do I need to do to convert it for the automatic? Thanks

 

[dvalentine]

Measure from inside the yoke on the 700r4 to inside the yoke on the differential. Take that measurement to a shop that can make you a new drive shaft. The shop must be one that does this on a regular basis as it will require balancing. It should cost around $100.