rear diff bolt upgrade

[ron@whooshmotorsports]

Replace the weak OEM TTY bolt(s) on your Explorer ST before it bends or shears off
The upgrade is perfect for any 1 or 2 rear bolt ST's with or without an aftermarket rear diff brace
Features:
class 12.9 alloy-steel
Includes 1 bolt, 1 lock washer, 1 flat washer
Recommended torque: 100 ft/lbs
Requires a 12mm , 1/2" drive hex socket to install
Link to product >>> https://whoosh-motorsports.myshopif...me-duty-rear-motor-mount-bolt-set-explorer-st

 

[2020FordRaptor]

That’s very neat. Now I would also be interested in a bushing upgrade for the subframe.

 

[Cruising68]

I ordered 2 just to be safe even though I replaced the 1 bolt with a 2 bolt. Let’s just say the oem was not confidence inspiring the way it bent like spaghetti.


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[Cdubya]

It would be something if this upgraded bolt could replace the need for an aftermarket rear diff brace.

 

[ron@whooshmotorsports]

I ordered 2 just to be safe even though I replaced the 1 bolt with a 2 bolt. Let’s just say the oem was not confidence inspiring the way it bent like spaghetti.


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thank you

 

[ron@whooshmotorsports]

It would be something if this upgraded bolt could replace the need for an aftermarket rear diff brace.

I don't believe that's possible especially if you have a rear single bolt style subframe
The bolt upgrade is definitely added cheap insurance against the stock bolt(s) bending or shearing off

 

[SimonsGTS]

Ordered!!

 

[Excalibur]

Any data on the difference in shear strength between the OEM one and this one?

 

[Cdubya]

According to this, Class 12.9 bolt has 20-25% greater tensile strength than a 10.9 (OE) one.

What-is-the-difference-between-a-10-9-and-12-9-Bolt

 

[Cruising68]

Nice. Looks like about 20% improvement in shear strength too. I’m assuming a bending bolt is a result in too low tension strength. My single bolt was definitely bent before I put the 2 bolt subframe in.

Worst case these bolts should give some cheap insurance and a little piece of mind. Until the diff housing cracks


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[Kevin_FG23]

I'm curious why the recommended torque on the Class 12.9 bolt is only 100 lb.ft., when the OEM bolt spec appears to be 148 lb. ft., per RCLRPT-23V675.

 

[Big Turk]

Nice. Looks like about 20% improvement in shear strength too. I’m assuming a bending bolt is a result in too low tension strength. My single bolt was definitely bent before I put the 2 bolt subframe in.

Worst case these bolts should give some cheap insurance and a little piece of mind. Until the diff housing cracks


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I think this is a good point. Sometimes you design a system with a built-in in weak point so you know what will break first. If you strengthen the weak point then something else might break first instead. I have no idea if a stronger bolt will out perform the diff housing threads, but it could and which would you prefer to replace a bolt or the housing. I would prefer neither, but of the two...

 

[Mekks082]

I'm curious why the recommended torque on the Class 12.9 bolt is only 100 lb.ft., when the OEM bolt spec appears to be 148 lb. ft., per RCLRPT-23V675.

Was wondering the same thing.

 

[ron@whooshmotorsports]

we've added the pinion bolts to the diff as well, slightly longer / same 12.9 spec
https://whoosh-motorsports.myshopif...uty-pinion-bolt-upgrade-2020-2024-explorer-st

 

[Gatorst1r]

Any tips on getting the existing diff bolt removed for replacement? I’m having a hell of a time trying to loosen it

 

[WaferTech]

Any tips on getting the existing diff bolt removed for replacement? I’m having a hell of a time trying to loosen it

I used 10" race ramps and beaker bar extensions......It's nearly impossible to do unless it's on a lift.....

 

[EDWYER]

Looks like about 20% improvement in shear strength too./QUOTE]

Nice