GrimmSpeed Shifter Bushing Kit – 2004–2021 Subaru STI | 6-Speed | GRM.1153.1.0

STI 6-speed manual only. Covers GD/GG (2004–2007), GR/GH (2008–2014), and VA (2015–2021) chassis. Confirm your transmission is the 6MT before ordering.

GrimmSpeed GRM.1153.1.0 shifter bushing kit for the 2004–2021 Subaru STI with the 6-speed manual transmission. Replaces worn OEM rubber shifter bushings to eliminate shifter slop and restore precise, direct shift feel. 1.5 lbs. Ships fast across Canada and the US.

Why Replace the Shifter Bushings

The STI 6-speed shifter linkage uses rubber bushings at the shifter base pivot and along the shift rod connections. New, these bushings provide smooth, vibration-isolated shifter movement. Over time, the rubber softens, compresses, and cracks — the result is lateral play, front-to-back slop, and a vague, imprecise shift feel where the shifter moves noticeably before engaging a gear. On a used STI, worn shifter bushings are one of the most common causes of a notchy or imprecise shift feel that can be mistaken for transmission wear. Replacing the bushings is typically the first and most cost-effective step before suspecting the transmission itself.

GrimmSpeed Bushing Kit — Firmer, More Direct Shift Feel

GrimmSpeed’s bushing kit replaces the OEM rubber bushings with precision-fit aftermarket bushings that eliminate the rubber compliance responsible for shifter slop. The result is a noticeably more direct, gate-defined shift feel — less throw vagueness, better gear location confidence, and a shorter effective shift arc. The shift feel will be firmer than OEM — this is the intended outcome. Buyers accustomed to the soft feel of a stock STI shifter should expect a more mechanical, precise character after installation, which is the goal of the upgrade.

2004–2021 STI 6-Speed Coverage

The Subaru STI has used the 6-speed manual (6MT) continuously from the 2004 GD/GG-generation through the 2021 VA-generation. The shifter and linkage bushing geometry is consistent across all three chassis generations — GD/GG (2004–2007), GR/GH (2008–2014), and VA (2015–2021) — which allows a single kit to cover 17 years of STI production. The WRX used a 5-speed in earlier years; later 6-speed WRX owners should verify compatibility before ordering.

STI 6-speed manual only. Shift feel will be noticeably firmer than OEM after installation — this is the expected result. Lubricate bushings with appropriate grease during installation. Inspect shift linkage and rod ends for additional wear while the linkage is disassembled.

Specifications

• Brand: GrimmSpeed
• Part Number: GRM.1153.1.0
• Type: Shifter bushing kit
• Transmission: 6-speed manual (6MT)
• Weight: 1.5 lbs
• Application: 2004–2021 Subaru STI — GD/GG, GR/GH, VA chassis