1985 D150 SWB 904 to 727 swap, need driveshaft length!!

Slip yoke are different between 727 and 904,727 has more splines. ...
Just have your driveshaft shortened by a driveshaft shop.
Your rear u joint already bolts up to your rear end.
Slip yoke in the front can be purchased thru any drive shaft shop....
Try inland truck parts on hwy 290.
Maybe there is a DTS out your way,we got one in buda....Just avoid Scotty's on airport,new owners...
Be sure and measure from back of tranny to rear yoke as shown above with all four wheels on the ground !!!