Ok here is the deal I'm putting a 14ff in my 85 K5 and so far everything has gone pretty smooth. I have finally come across the problem of my driveshaft u joint from the blazer does not fit the pinion yoke on the 14ff. How can I fix this? Can I pull the pinion yoke off of the old 10 bolt and put it on the 14ff? I tried going to autozone to find a u joint that would fit both and I couldn't find one. Is there a special u joint that I can put in it and if so who makes it and where can I find one?