going from 4 spd to 727 auto in 76 duster small block.
can i swap over the tranny mount off of the 4spd or is auto and 4 spd different size/height ?? also will the 4 spd slip yoke work on the 727 ?? I know i will have to shorten the drive shaft.

I am pretty sure the tranny mount is the same along with the yoke

I don`t remember exactly so don`t hold me to it but I think the 727 and 833 were the same for the most part. I think some early 833`s had the 904 yoke size. Should be 30 spline for 727 and 26 spline for 904 IIRC. With the 833 could be either spline depending on the year. The trans mount should be the same.