From all the writeups I've read, a dana 300 will bolt to a 727 with no mods. This is what I decided to go with in my 79 cj5. So I get a 727 from a 81' wagoneer, and a dana 300 from a cj 7, and when i go to put them together, the bolt pattern is the same and all, but the output shaft on the 727 is too small in diameter for the input on the dana 300. It just wallows around inside of the dana 300's input. I didnt read anywhere you needed a new output shaft for the 727. Anyone done this combo, or have any info on replacing the tailshaft on a 727? thanks.