Let's see if I remember...the 700r d-shaft will bolt to a 14bff w/o a conversion joint(I know that's not the question)and...I think,mine had to be extended from 64"-67".HOWEVER...I didn't use the 700r d-shaft.I pulled one off a '78 J20,used that because it had a slip-shaft.cost for extending w/ new spicer u-joints in both ends was $152+ change out the door.I don't think there's any way you'll know until you do the swap.I forgot: No lift involved in my swap.stock height.