Have you ever noticed that everybody who has ACTUALLY towed with an F150 is now driving a Power Stroke?
The overflow lot at the Bronco Round Up last month looked like an F350 convention. I'm not going to go into ALL of the reasons NOT to tow with an F150. I'm just going to focus on one.
The reason why you don't tow with an F150 is because of the rear axle bearing. The cylindrical bearing is the worst idea EVER implemented in a pickup truck, and they absolutely suck. This is the bearing that fails every time it is actually used. The R1561TV is the evolution of the original c-clip style axle bearing used in GM passenger cars since 1964. It is a derivation of the Timken 5707 bearing, that continued to get bigger (not better) over time. The Timken 5707 was used as a rear axle bearing from 1964-2011.
These cylindrical bearings rely on the axle shaft itself to be the inner "race" of the bearing. As such, as they wear...they eat the axle shaft. Once they wear out the case hardened surface of the axle shaft, they eat thru the shaft themselves. Then the axle end falls off. Fortunately, modern trucks have the disc brake caliper available to keep the wheel from bouncing down the highway. They are DESIGNED to FAIL.
In 1964, the GM 10 bolt had the 5707 at 1.401 inch diameter. It grew to 1.622 (Timken 6408 in the explorer and ford 8.8) and finally got to 1.705 inch by the time it found its way into the mid 80's semi-float F250 and Econoline. This cylindrical design is SO BAD...that they actually list sleeve and repair kits as a service part. (as if it were normal...)
So the axle shaft is now almost 1-3/4 in diameter out at the end. And they still don't last. It's a stupid design for an axle that carries a load. It has no business on a truck. It turns out that the most arrogant engineers on the planet are the one's that work for Tier 1 OEM suppliers to Automotive. OEM engineers have to live with their failures, but Tier 1's believe that their poop doesn't stink. Every horrible idea that has found it's way into a production vehicle was promoted as a low cost alternative by an incompetent tier 1 supplier. Someday I am going to make a list of colossial tier 1 fails. It will include unit bearing, c-clip axle, 700-R4, Dana 35, TTB, and anything Getrag.
Pickup trucks are the reason why the term "use and occasional misuse" was invented. I want my truck to be running long after I use it. Get a full float rear axle in your truck.
2006 Mega Cab Cummins for the win...