ZR2/AT4X Part Numbers & Conversion Info

[Epsilon Plus]

Knuckle:

 

 

 

Steering Knuckle Replacement.pdf

Edited May 20, 2025 by Epsilon Plus

[Epsilon Plus]

Rear Suspension w/ Torque Specs

 

 

Rear Leaf Spring Replacement.pdf Rear Suspension Torque Specs.pdf

[Epsilon Plus]

Brake caliper torque specs:

Brake Caliper Torque Specs.pdf

[angel ullom]

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 June 25, 2025 by angel ullom
Need to ask another question

[calcagno21]

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]

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

[OS RR]

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 February 18 by OS RR

[friasd]

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 

[kylant]

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