When I bought my three truck deal, my first adventure in 6.9 ownership, the tow truck was an 85 F350 with a 6.9 NA. He brought the 460 equipped F10 home easily, the 4X4 87 F250 gave that wrecker all it wanted, but before getting the 85 F350 4X4 Dually home, he had broken one rear axle, wrung the teeth off his pinion gear, forcing removal of both rear axles and the rear drive shaft and then he couldn't make the hill to my house with just the front end pulling. You probably aint going to like this, but I hooked my 2 wheel drive Chevy, 5.0 L extended cab to him and finished pulling him and my new purchase home. It was only a short distance and he could help, just couldn't stop spinning his fronts trying to pull that load. Anyway, my Ford loving buddy was there, he still gets **** over it!!!
Personally, I love the 6.9 and 7.3, but would not have my 87 if is was a Ford gasser.