Slip yoke

pntastar69 is correct. 904 used a different yoke than A833. A833 and 727 yokes are the same. There are two 727/A833 yokes available. One uses the small 7260 u-joint, and was mostly a small block application. The other uses the large 7290 U-joint, and was mostly big block application. Both fit the 4-speed, but you will likely need the smaller 7260 U-joint. The fit will be dictated by which drivehsaft you use.