Aluminum / XFE NNBS Front Suspension Rebuild

Omran99937 · Saturday at 2:54 PM

I just installed the aluminum control arms and knuckle on my 2013 Silverado. I followed ur list of items and everything fits perfectly with no play.
Only faced one issue when installing the wheel hub bearing on the aluminum knuckle with brake cover.
There was an interference of the brake cover and the aluminum knuckle.

My solution was to just delete that cover, since my build is for drag racing.

mountie · Saturday at 3:26 PM

Omran99937 said:
I just installed the aluminum control arms and knuckle on my 2013 Silverado. I followed ur list of items and everything fits perfectly with no play.
Only faced one issue when installing the wheel hub bearing on the aluminum knuckle with brake cover.
There was an interference of the brake cover and the aluminum knuckle.

My solution was to just delete that cover, since my build is for drag racing.

Welcome to the forum !
Lot’s of smart / experienced members here…..
>>>>>>>. PICTURES please <<<<<<<<

Uh, drag racing ??

Omran99937 · 2026-06-09T01:22:24-0400

For reference, the car is 2013 Silverado single cab 4x4

Steel Upper control arm 3.1 kg

Steel knuckle 7.75 kg

Cast steel lower control arm 11.2 kg

Compared to aluminum suspension parts

Aluminum upper control arm 1.95 kg

Aluminum knuckle 3.9 kg

Aluminum lower control arm 6.8 kg

For your information I also compared the lowering lower control arm from IHC suspension for 2013 silverado

7.95 kg

Omran99937 · 2026-06-09T01:39:22-0400

I checked the ball joints taper width as well as the holes in the knuckles to compare the aluminum and steel

Aluminum knuckle | upper control arm ball joint hole 0.75 in

Aluminum upper control arm ball joint width 0.79 in

Aluminum knuckle | lower control arm ball joint hole 1.04 in

Aluminum lower control arm ball joint width 1.06 in

Steel knuckle | upper control arm ball joint hole 0.65 in

Steel upper control arm ball joint width 0.69 in

Steel knuckle | lower control arm ball joint hole 0.87 in

Steel lower control arm ball joint width 0.90 in

Here i compared the tie rod holes on the knuckles

Aluminum 0.71 in

Steel 0.66 in

Tie rod for 2016 silverado electric rack and pinion 0.72 in

Omran99937 · 2026-06-09T01:45:46-0400

Use the provided data as needed. After checking the difference, I installed the aluminum suspension parts and they fit prefectly with no play

Everything bolts the same place, including the wheel hub bearing and brake calipers

The problem i faced was with the brake dust cover, it was interfering with the aluminum hub causing the cover to bend and rub on the brake disk at the bottom

This is where it was interfering

Aluminum / XFE NNBS Front Suspension Rebuild

Omran99937

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mountie

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