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Safety Recall 22S27 Rear Axle Bolt Fractures
- Thread starter TFocker
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- Long Island, NY
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- 2021 Explorer ST, 2012 Boss Mustang, 2019 Audi S4
L_CLK|clp:2047675&epid=25052022055
- Messages
- 120
- Reactions
- 54
- Points
- 27
- Location
- Long Island, NY
- Vehicle
- 2021 Explorer ST, 2012 Boss Mustang, 2019 Audi S4
- Messages
- 120
- Reactions
- 54
- Points
- 27
- Location
- Long Island, NY
- Vehicle
- 2021 Explorer ST, 2012 Boss Mustang, 2019 Audi S4
- Messages
- 120
- Reactions
- 54
- Points
- 27
- Location
- Long Island, NY
- Vehicle
- 2021 Explorer ST, 2012 Boss Mustang, 2019 Audi S4
ARP didn't return my message again, so I called them. They say there was never anything produced for the Explorer and that the stud used in the picture must have been an ARP stud modified by a 3rd party and installed on an Explorer. They had zero interest in producing a stud after explaining the problem we are trying to solve. They said a one-off custom unit could be made through their custom orders department, but they would need the dimensions of the factory bolt and would quote out cost at that time.
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- Messages
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- Long Island, NY
- Vehicle
- 2021 Explorer ST, 2012 Boss Mustang, 2019 Audi S4
As far as the "fix it with a better bolt" idea- that's a band-aid. I think you're addressing the wrong problem from an engineering perspective. I have seen pics of bolts snapped- meaning they were subjected to enough force to actually break them. I've also seen pics of bolts that seem to be bent. It's actually possible that any replacement bolt from Ford has been designed to bend rather than break so as to contain the rear diff and minimize damage.
Under both of these scenarios, that bolt is held in plane by a high durometer bushing. You can't convince me that the bolt broke before that bushing absorbed some fairly large rotational movement of the rear differential prior to the failure. I highly doubt given the current bushing that an "upgraded" bolt will solve the problem. I'd instead go for the AWR or ID speed brace which provides another bushed mounting point as well as balancing the load horizontally across the rear of the diff.
You should also try to eliminate wheel hop- the violent wind-up followed by an unwind event will break just about anything.
Under both of these scenarios, that bolt is held in plane by a high durometer bushing. You can't convince me that the bolt broke before that bushing absorbed some fairly large rotational movement of the rear differential prior to the failure. I highly doubt given the current bushing that an "upgraded" bolt will solve the problem. I'd instead go for the AWR or ID speed brace which provides another bushed mounting point as well as balancing the load horizontally across the rear of the diff.
You should also try to eliminate wheel hop- the violent wind-up followed by an unwind event will break just about anything.
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First would be not launch as violently (yeah, nobody wants to hear that). Put on less sticky, or way more sticky tires (you probably don't want to hear that either!) Barring that, you'd have to find some way to lower the amount of deflection in all the suspension pieces related to rotational movement.
Let's face it, the average ST has nearly 160 lbs of wheel and tire in the rear plus the mass of the brake rotors. When that mass loads and then unloads all the various bushings meant to give you a somewhat silent and cushy ride, something has to give.
Let's face it, the average ST has nearly 160 lbs of wheel and tire in the rear plus the mass of the brake rotors. When that mass loads and then unloads all the various bushings meant to give you a somewhat silent and cushy ride, something has to give.
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I’m guessing with the two bolts you are virtually eliminating that rotational stress on the bolt and bushing by spreading it across two points. Also guessing that significantly reduces the deflection in the bushings as rotational force would result in upward movement of one bushing and downward movement of the other, no?
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