Originally Posted by gotsand?
correct me if I'm wrong, but I was always told that towing in OD isn't what hurt the transmissions, it is when the vehicle is always downshifting/shifting in order to maintain speed.
towing flat, and not an extremely heavy of a load is ok in OD as long as the truck isn't kicking down alot. once it starts downshifting, is the time to take it out of OD.
you are correct...that whats hurting the tranny, shifting in and out of OD a lot. I never use OD when towing my camper as its too heavy of a load for my 350ci to maintain 4th gear. The other day towing a empty 18' car hauler I left in OD, towing it on flat level roads.