I think there have been topics on this before, but can't find them. Can someone help me out on what is involved in installing a late model AOD tranny into my 68 mustang. I currently have a 351w with the original 3 speed behind it. do i need new cross member, do i have to fab one, or does some produce one. does the drive shaft length change? I plan on using a ratcheting shifter so linkage will not matter, and an after market cooler, so radiator won't matter.