rear end conversion question help please
 

happy holidays everyone!!! I'm about to swap my stock 12 bolt rearend out of my 69 short fleet for a dana 60 and was wondering if any one has done a swap like this before? my main question is whether or not you had to get the stock drive line shortened for the dana. At a rough first glance the dana 60 carrier looks to be a little longer than the 12. thanks for any help