What actually causes the rake in the Max Tow?

[trabo]

What did you order? Your payload will be in the 1350-1650 range (4x4) depending on options. My XLT is 1460 (factory sticker) -- however using ford's own methods I calculate it out to be right about 1840lbs via percent of combined GVWR/GAWR. More info in my franken-frame post
https://www.f150gen14.com/forum/threads/the-pbs-franken-frame-and-gimped-gvwr-sticker.13070/

My order was actually incorrectly input, I had to buy one off a lot when my custom showed up with the wrong bed. The “substitute” is being transported to me today (bought it last week). 6.5’ Box PB 4x4 with Max Tow.

The reality is that I threw out 2500 pounds not really calculating. Typically my loads are in the 200-300 pound range. Each set of instruments is about 20-25 pounds and each set of implants is about 40-50. If we had some crazy situation where I needed a lot of everything I’d push something more like 1,000 pounds.

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[trabo]

The nut

This is just the rear axle?

 

[Polo08816]

This is just the rear axle?

+1. I can't really tell whether it's the front or rear.

 

[Groovicles]

+1. I can't really tell whether it's the front or rear.

If assembly is required is probably the rear ?

 

[Supercub]

This is just the rear axle?

That gentlemen is the FRONT.

If assembly is required is probably the rear ?

 

[trabo]

That gentlemen is the FRONT.

so are the calipers bigger on the front AND the back on the max tow?

 

[HammaMan]

so are the calipers bigger on the front AND the back on the max tow?

No, calipers aren't larger on either. The swept area of the max tow is increased by... wait for it now...
2%

The max tow's rear axle design is flawed and is snapping axle retention bolts quite frequently now. It shows up more on piggy boosts as they're carrying ~750lbs more mass empty. The axle has now vanished in 24.

 

[trabo]

No, calipers aren't larger on either. The swept area of the max tow is increased by... wait for it now...
2%

The max tow's rear axle design is flawed and is snapping axle retention bolts quite frequently now. It shows up more on piggy boosts as they're carrying ~750lbs more mass empty. The axle has now vanished in 24.

Really? I’ve seen multiple posts about smaller rims not fitting over the max tow calipers. What does “swept area” mean?

thx

 

[HammaMan]

Really? I’ve seen multiple posts about smaller rims not fitting over the max tow calipers. What does “swept area” mean?

thx

Swept area is the sum of the entire surface of the rotor in which the brake pads engage. Front brakes are the same, rear brakes have thicker rotors in an attempt to stave off heat soak, which more mass will do, but on cooling it's the opposite. Big thick rotors stay hotter longer as the area is the same. Slotted / cross drilled rotors have less mass and heat up faster, but also have more surface area and cool faster.

From everything I've been able to gather, the max tow axle wasn't needed as there's nothing wrong with the standard 9.75 in terms of axle failures, but max tow axles are now failing catastrophically causing loss of power (wheel stays on).

 

[trabo]

Swept area is the sum of the entire surface of the rotor in which the brake pads engage. Front brakes are the same, rear brakes have thicker rotors in an attempt to stave off heat soak, which more mass will do, but on cooling it's the opposite. Big thick rotors stay hotter longer as the area is the same. Slotted / cross drilled rotors have less mass and heat up faster, but also have more surface area and cool faster.

From everything I've been able to gather, the max tow axle wasn't needed as there's nothing wrong with the standard 9.75 in terms of axle failures, but max tow axles are now failing catastrophically causing loss of power (wheel stays on).

Oooh man… can I fix this by leaving the fan on 5 or higher??

 

[HammaMan]

Oooh man… can I fix this by leaving the fan on 5 or higher??

Ha, no

 

[Calson]

My 2022 Max Tow equipped truck has an additional leaf spring at the rear wheel and no other modifications. The rake is so slight I would need a digital level to measure it assuming I would find a perfectly level place to park the truck.

I may be unusual but I use my pickup truck as a pickup vehicle and so there is always at least 200 lbs on the rear and often more than 1000 lbs of load weight on the rear axles. A trailer tongue and WDH can easily add 700 lbs of load to the rear wheels. Raising the front would be a great way to blind oncoming drivers with my truck's headlights which I prefer not to do.

I remember the days of the Ford and Chevy "pickups" that were 2WD versions of station wagons with the rear section removed like the El Camino that I owned as a teenager. That vehicle definitely needed air shocks to make it close to level, even with a only a few hundred pounds of something in the bed.

 

[Groovicles]

My 2022 Max Tow equipped truck has an additional leaf spring at the rear wheel and no other modifications. The rake is so slight I would need a digital level to measure it assuming I would find a perfectly level place to park the truck.

I may be unusual but I use my pickup truck as a pickup vehicle and so there is always at least 200 lbs on the rear and often more than 1000 lbs of load weight on the rear axles. A trailer tongue and WDH can easily add 700 lbs of load to the rear wheels. Raising the front would be a great way to blind oncoming drivers with my truck's headlights which I prefer not to do.

I remember the days of the Ford and Chevy "pickups" that were 2WD versions of station wagons with the rear section removed like the El Camino that I owned as a teenager. That vehicle definitely needed air shocks to make it close to level, even with a only a few hundred pounds of something in the bed.

You sure your vehicle isn't leveled ? I have max tow on my 22 PB as well and the rake was certainly more than noticeable (no digital leveling device required!) but not overly so.

 

[HammaMan]

Piggyboost comes with max tow springs in all trims, as such there's no difference in stance between MT PBs vs non MT. The long bed by moving the axle rearwards by ~10% could place more weight on the front axle than the rear as the heavier parts of the vehicle are in the front half. This is why the front axle rating on long bed PBs is slightly higher. One wave of ford's magic ratings wand and voila, more axle rating on the same components.

 

[dafish]

PB has max tow springs already, only axle changes optioning it on PB and that doesn't change height. On the long bed the rake is more obvious because there's more truck there to see it in the lines (and just a hair less weight on the rear axle empty). Keep in mind when it comes to levels, the PB ends up getting about 1/2 inch less than other trims because it's the piggyboost. I used pucks on mine. The front suspension doesn't have me desiring something else. Perhaps if I did more off road activity my opinion would differ.

All PBs have that rear spring config though, max tow adds the axle and bumper to frame pieces. So when you read threads on PB levels and whatnot, the max tow doesn't change anything visibly, leveled or otherwise.

I believe, this from the greater detail available on the '21's, is that PB is 3 leaf but not the same rate as max tow.

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