ZR2/AT4X Part Numbers & Conversion Info

[Epsilon Plus]

Deep in the vaults of GM engineering I'd imagine.

[pewterliftedz]

@newdude any chance you can pull the ZR2 HD fender flare part numbers.  It requires little mud flaps too.  Should be about 10 pieces total 

[newdude]

13 hours ago, pewterliftedz said:

@newdude any chance you can pull the ZR2 HD fender flare part numbers.  It requires little mud flaps too.  Should be about 10 pieces total 

 

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.  

[pewterliftedz]

You’re the man! 

[OS RR]

Looking at pictures (and a coworkers ZR2), I'm not seeing it, what's the difference with the flares?

[newdude]

39 minutes ago, OS RR said:

Looking at pictures (and a coworkers ZR2), I'm not seeing it, what's the difference with the flares?

 

 

Pretty sure they are wider to cover for the wider tires.  Same height though as the box sides and fenders are the same p/n regular vs ZR2.  

[pewterliftedz]

17 hours ago, OS RR said:

Looking at pictures (and a coworkers ZR2), I'm not seeing it, what's the difference with the flares?

ZR2 flares are wider to accommodate the bigger tires, and mud flaps don’t hang as low. 

[OS RR]

On 9/14/2024 at 3:12 PM, pewterliftedz said:

ZR2 flares are wider to accommodate the bigger tires, and mud flaps don’t hang as low. 

 

I parked next to my co-workers ZR2 yesterday. Sure enough they are! Hadn't even noticed. Its kind of a "10ft look", unless you're up close you can't really tell.

[BCM]

Any chance anyone has the part numbers for the AT4X Fender Flares or know where to find them?  Have struck out so far searching.

[tonto340]

I added almost every part number listed for the conversion to a cart on https://www.gmpartsoverstock.com/cart and the total came to $3717.21 plus over $350 for shipping. The only item I didnt add was the U-bolts because my 2500 has the max towing package which includes the 3500 rear suspension. I would have to get the u-bolts from a different place.

Edited November 19, 2024 by tonto340
additional info

[Epsilon Plus]

GM TDS (Service Manual Documents) that are relevant to this swap:

 

Front axle & diff drop brackets:

Front Axle Shaft Torque Specs.pdf Front Axle Torque Specs.pdf Front Differential Carrier Bracket Replacement - Left.pdf Front Differential Carrier Bracket Replacement - Right.pdf

[Epsilon Plus]

UCA & Front suspension torque specs:

 

Front Suspension Torque Specs.pdf Upper Control Arm Replacement.pdf

[Epsilon Plus]

LCA

Lower Control Arm Replacement.pdf

[Epsilon Plus]

Hub & Torsion Bars

Front Wheel Bearing & Hub Replacement.pdf Front Wheel Hub Extension Replacement.pdf Torsion Bar Replacement.pdf

[Epsilon Plus]

Stabilizers, Trim (Z) Height & UCA Torque (Caster/Camber)

Front Stabilizer Shaft Link Replacement.pdf Front Stabilizer Shaft Replacement.pdf Trim Height Inspection.pdf

Front Stabilizer Shaft Replacement.pdf Caster - Camber Torque Specs (Upper Control Arm).pdf

Edited May 20, 2025 by Epsilon Plus