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rear diff bolt upgrade

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#1
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

IMG_2497 (1).jpg
IMG_5846 (1).jpg
 

Last edited:

2020FordRaptor

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#2
That’s very neat. Now I would also be interested in a bushing upgrade for the subframe.
 

Cruising68

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#3
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

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#4
It would be something if this upgraded bolt could replace the need for an aftermarket rear diff brace.
 

OP
ron@whooshmotorsports
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Thread Starter #5
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.


Sent from my iPhone using Tapatalk
thank you
 

OP
ron@whooshmotorsports
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Thread Starter #6
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
 

Excalibur

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#8
Any data on the difference in shear strength between the OEM one and this one?
 

Cruising68

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#10
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


Sent from my iPhone using Tapatalk
 

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Pearland, TX
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2023 Explorer ST
#11
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.
 

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#12
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


Sent from my iPhone using Tapatalk
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...
 

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Colorado
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2022 Explorer ST
#13
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.
 



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