Auto OD questions

Charrlie, I agree with the 518 for towing. As you know it is a 727 with the OD attached to the tail section.A rebuild should be straight foward.I may be incorrect but the early 518 did not use a lockup converter if I remember.I think maybe,, ?? I too have a 88 Ram and have been thinking on doing the same.Hope it all works out and I will follow your lead.