• 1" FK uniballs where the factory arm uses a rubber bushing — the bushing is what deflects under load and lets the axle move around, and the uniball is what stops it
• Aluminum ball post for the wheel position sensor, so the truck keeps reading rear suspension position and the adaptive shocks keep working
• Custom machined 17-4 stainless steel spacers sized to drop into the stock mount locations, so there is no bracketry to change
• Urethane wobble stopper at the front mounts to keep the arms in alignment
• Billet aluminum, available raw or in Fox Orange, Black or Blue anodize

Kit includes: (2) FMI billet aluminum rear upper arms with spacers and hardware.

This listing is the upper pair. Three ways to go:

• Uppers only — this page. The pair that carries the ball post.
• Lowers only — the billet rear lower arms.
• Everything — the complete 2027 rear suspension arm kit, uppers and lowers together.

Available raw billet or anodized in Fox Orange, Black or Blue.

Anodizing is a surface finish, not paint. Wash off desert dust and road salt, and keep harsh acidic wheel cleaners away from the arms — those are the fastest way to dull an anodized finish.

2027 Ram 1500 TRX, factory rear mount locations.

The 2021, 2022, 2023 and 2024 TRX is a different generation and uses the 2021-2024 billet rear upper arms. There was no TRX built between those two runs.

Will the rear ride height sensor still work?

Yes. The upper arm carries the ball post for the wheel position sensor, which is what keeps the truck reading rear suspension position correctly.

Are the lower arms included?

No, this is the upper pair only. See the options in the section above for lowers or the complete kit.

Do I need to modify the frame?

No. The spacers are machined to fit the stock rear mount locations.

Is the ball post aluminum or steel?

Aluminum on these billet upper arms. Fabricated rear upper links use a steel ball post welded in instead.

Does this fit a 2021-2024 TRX?

Yes. See the Fitment section above for that truck's version.