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ZR2/AT4X Part Numbers & Conversion Info

Epsilon Plus

By Epsilon Plus
in Modifications & Accessories

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Epsilon Plus
Epsilon Plus

Since the introduction of the ZR2 HD, many of us have waited for the parts to start hitting the market. They are now rolling out so let's build a thread where we can compile all the info on part numbe

Epsilon Plus
Epsilon Plus

I wish I could edit the original post as planned, but apparently that option times out. That said, here is some relative follow-up information from the larger discovery thread. This thread can serve a

Epsilon Plus
Epsilon Plus

Relevant torque specs:   Front Lower Control Arm Ball Stud Nut: First Pass 37 lb ft, Final Pass 90 -100 degrees    Front Lower Control Arm Nut [2x] First Pass 133 lb ft, Final Pass

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  • 1 month later...
angel ullom Enthusiast

angel ullom

Posted
Posted (edited)
On 5/20/2025 at 5:12 PM, Epsilon Plus said:

Brake caliper torque specs:

Brake Caliper Torque Specs.pdf 859.29 kB · 10 downloads

Hey Epsilon I appreciate all the hard work you have done with providing the information do you think the ZR2 upper and lower control arms will work with the factory stock knuckle and if so would I need new nuts for the ball joints or are they the same nut size I appreciate it.

Edited by angel ullom
Need to ask another question
  • 4 months later...
calcagno21 New Member

calcagno21

Posted
Posted

This is a great write up and props for the work that went into compiling all of this. So in regards to the install. What is being done with the torsion bars themselves? Does the "lift" come from the geometry in the new control arms and knuckles? Are you keeping the torsion bars in the same position essentially then? Are you just adjusting until you get the desired 1.5" lift height?

kylant Enthusiast

kylant

Posted
Posted
15 hours ago, calcagno21 said:

This is a great write up and props for the work that went into compiling all of this. So in regards to the install. What is being done with the torsion bars themselves? Does the "lift" come from the geometry in the new control arms and knuckles? Are you keeping the torsion bars in the same position essentially then? Are you just adjusting until you get the desired 1.5" lift height?

exactly

  • txab pinned this topic
OS RR Enthusiast

OS RR

Posted
Posted (edited)
On 9/13/2024 at 9:56 AM, newdude said:

 

86591005 and 86591004 front flares, 85647450 and 85647449 rear flares.

 

86598488 and 86598487 front lower protector at the back of the front flares, 85543636 and 85543637 for the front of the rear flares, 85543635 and 85543634 for the back of the rear flares.  

 

Anyone know the part number for the attachment clips?

Edited by OS RR
  • 1 month later...
friasd New Member

friasd

Posted
Posted

hello everyone does anyone know if the fender flares from a 2024 GMC 2500 sierra AEV would fit a 2024 silverado 2500 AEV , that is the only thing missing from my silverado , i believe 

  • 2 weeks later...
kylant Enthusiast

kylant

Posted
Posted
On 4/2/2026 at 11:57 PM, friasd said:

hello everyone does anyone know if the fender flares from a 2024 GMC 2500 sierra AEV would fit a 2024 silverado 2500 AEV , that is the only thing missing from my silverado , i believe 

they will not. different shape

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