727 motorhome tranny question

There was a slight spline angle change on the front end of the output shafts in 76 so if you plan on using an output shaft from one in the other make sure their compatible. In other words if both trans. you have are of the 66-75 vintage or both are of the 76-93 vintage your ok. Just don't try to use an early output shaft in a late trans. or vice versa. Their easy to identify by an extra groove in the 76-93 shaft right before the turned down section in front of the output splines. Here's a picture showing what they look like. You'll notice I didn't include the early 62-65 transmissions because I figure it's unlikely yours are of that vintage.