ACT Clutch Disc Alignment Tool | 24-Spline / 1.000" Input Shaft (AT90)

The $4 Lifesaver of Your Transmission Install
There is nothing worse than fighting a heavy transmission bellhousing on a transmission jack because your clutch disc is off by a single millimeter. The ACT Clutch Alignment Tool (AT90) is a simple, impact-resistant plastic tool that saves you hours of frustration.

Before torqueing down your pressure plate bolts, slide this tool through the center of the clutch disc and press the nose directly into your ACT PB1004 Pilot Bearing. This locks the clutch disc perfectly dead-center. Once the pressure plate is torqued down, pull the tool out, and your transmission input shaft will slide right into place with zero fighting.

While a copy of this tool is included in complete boxed ACT clutch kits (like the SB10-HDSS or SB11-XTSS), keeping an extra AT90 in your toolbox ensures you're never left high and dry if your original tool gets misplaced or loaned out to a buddy.

Technical Specifications:

• Part Number: AT90
• Component Type: Manual Clutch Alignment Tool
• Material: Heavy-Duty Injection Molded Plastic
• Input Spline Count: 24-Spline
• Input Shaft Diameter: 1.000 in.
• Pilot Bearing Nose Diameter: 0.470 in.
• Product Weight: 0.1 lbs

Core Fitment Applications:

Engineered specifically for 24-spline Subaru and Toyota/Scion manual transmission input shafts.

• Subaru WRX: 2002–2026+ (5-Speed & 6-Speed Manuals)
• Subaru WRX STI: 2004–2021 (6-Speed Manuals)
• Subaru BRZ: 2013–2026+
• Toyota GR86 / GT86: 2017–2026+
• Scion FR-S: 2013–2016
• Other Manual Subarus: Fits manual transmission Forester, Crosstrek, Legacy, Outback, and Baja models spanning 1990–2023.

The Nameless "Toolbox" Pro-Tip:

Don't Lose It: These little black plastic tools have a magical habit of hiding in the deepest, darkest corners of a messy garage floor or rolling away under a tool chest mid-swap. Keep it plugged directly into your new clutch disc until the absolute very second you are ready to lift the transmission into position onto the engine dowel pins. Tape a bright piece of neon contractor tape to the pull-ring handle if you want to make it impossible to lose!