Driveshaft shortening question

Ok,well the thing is the yolk on the end of my driveshaft is still for the 904.Will it still slide in?I havent tried yet but I thought the shaft on the 727 was bigger than the 904s shaft.o.0

You'll need a 727 a yoke. Plus a different length tube, You might be better off to buy another drive shaft. Even if you still need a special u-joint at the rear, there's no need in going that route at the front joint also.