Adjustable two-piece front control arms. They give extensive caster adjustment and some camber adjustment, and you can change your settings quickly and easily. The trade-off is some strength compared with our one-piece GC GD Front Arms. If a two-piece arm is damaged, it's usually only the compression strut that bends, so repairs are simple.
Two-piece or one-piece?
| Two Piece Front Arms | GC GD Front Arms (one-piece) | |
|---|---|---|
| Adjustment | Extensive caster, some camber, easy to change | Caster chosen when you order, then fine-tuned with shims |
| Strength | Less than one-piece | Our strongest |
Choose two-piece if you want to fine-tune your front suspension settings. Choose one-piece if strength matters most.
Which one do I need?
1. TSSFAB Transmission Crossmember?
The arms tie into the front mounting point of the transmission crossmember. Our Transmission Cross Member has a thicker mount than stock, so the arms need different length spacers for each.
| If your car has | Choose |
|---|---|
| Our Transmission Cross Member | Yes |
| The stock crossmember | No |
2. Ball Joint/TSSPIN
| If you want | Choose |
|---|---|
| Stock geometry, with a stock Subaru ball joint, for rally, off-road, lifted cars, or track cars that don't need a large geometry correction | Stock Ball Joint |
| A large front geometry correction for a lowered track car, and you'll fit tie rod ends that lower the outer tie rod pivot to match | TSSPIN |
3. Arm Extension
| If you want | Choose |
|---|---|
| Stock length on a GC, GG, Legacy, Outback or Forester | GC/GG (-10mm) |
| Stock length on a GD | Stock GD |
| A wider front track | +20mm, +40mm or +60mm |
| Another length | Custom, and put the length you want over stock GD in the order notes |
4. Lifted Ball Joint Mount Angle
| If your car is | Choose |
|---|---|
| Lifted with lots of suspension travel, on the Stock Ball Joint | +5° |
| At stock height or lowered, or on the TSSPIN | Leave it off |
Options
TSSPIN
The TSSPIN replaces the ball joint and moves the outer pivot of the arm down 1.75". It's made for lowered track cars that need a large front geometry correction. To keep good suspension geometry, the outer tie rod pivot has to move down by the same amount, or as close to it as you can get. That means fitting tie rod ends made to correct bump steer. Without them, the steering will bump steer.
Stock Ball Joint
Fits the stock Subaru ball joint and keeps the stock geometry. It suits rally, off-road and lifted cars, and track cars that don't need a large geometry correction. On this version, the arm's outer rod end is replaced with a welded fork, so it handles braking loads.
Arm Extension
Every length longer than stock GD is measured from a stock GD arm. A +40mm arm is a stock GD arm plus 40mm. Stock GD is 0, and GC is 10mm shorter.
We believe GC/GG length is stock for the Legacy, Outback and Forester as well. If you're not sure which your car has, contact us before ordering.
Longer arms push the front wheels further out and widen the front track. Check that your wheels and tires still clear the fenders. Stock CV axles won't last with +20mm arms, and won't work at all with +40mm or +60mm.
Lifted Ball Joint Mount Angle
On a lifted car with a lot of travel, the stock ball joint mount angle can make the stock ball joint bind before the wheel reaches full droop. This option tilts the ball joint mount 5° more to stop that binding. It's meant for the Stock Ball Joint. It can be ordered with the TSSPIN, but there's no reason to.
Before you order
GC chassis. On a GC, part of the frame rail is in the way. You'll need to hammer it back, or cut and weld it, to fit these arms.
Steering angle. Depending on your wheel width and offset, the tire can hit the compression strut at full lock, which limits steering angle.
Alignment. These arms have a lot of adjustment. Set aside the time, or find a shop, to set them up properly.
Fitment
A front part for the GC/GD group:
- Impreza / WRX / STI 1993-2007 (GC, GF, GM, GD, GG)
- Legacy 1990-1999 (BC, BF, BJ, BD, BG, BK)
- Outback 1995-1999 (BD, BG, BK)
- Forester 1998-2008 (SF, SG)
- Legacy / Outback 2000-2004 (BE, BH)
Common questions
What's the difference between these and your one-piece arms?
Two-piece arms are easy to adjust and easy to repair. One-piece arms are stronger.
Do I need special tie rod ends with the TSSPIN?
Yes. The TSSPIN lowers the outer pivot 1.75", so the outer tie rod pivot needs to come down by the same amount, or as close as possible, to avoid bump steer.
Which length do I order?
GC/GG (-10mm) or Stock GD to match your car. Choose a longer arm only if you want a wider front track, and plan on upgraded CV axles.
Will my stock axles work with extended arms?
Not for long. They won't last at +20mm and won't fit at all at +40mm or +60mm.
Can I get them powder coated?
Yes, as an option on the product page. Powder coating adds about 2-6 weeks. See Powder Coating.