I have a 1994 F 2-50 351 auto and tow quite a bit, mostly cars and pickups. It has 210000 miles on it and it still runs out real good. On heavier loads I'll lock out the overdrive. I've been real lucky I guess because I i havent had any problems with it in the 6 years I've owned. I have heard the 460 will get better mileage but for me the 351 has been real reliable.
I would probably buy another if I had to replace it.
Downside of this truck is the front axle (TTB) if you plan to hook a plow, they are not the best.
Also mine is drinking a lot of gas, my tire size are 235-85-16, It does very well under 50 mph. my average is 32L/ 100km. i got 2 times a bad 50L/100km. This is not good at all but my annual millage is low, so it's ok for me.
Thanks for the comments. I think I am buying a 92 F250 with a 5 spd and a 460. It is an XLT and has everything. DId you guys say that the 460 gets better gas millage then the 351? That sounds too good to be true.
I have a 91 F-350 with the 351 My truck has a 12' Dump. I own a tree service on a normal day I will pull a 6000lb Skid steer on a 2000 lb trailer with about 2000lbs of logs in the bed It works No engine problems Had a new automatic tranny installed.