The optional DSSR (double shear selector rod) replaced the factory unit, and it was developed by UUC Motorwerks for added smoothness and precision. It runs an extra $129 on top of the $355 shift kit, but it’s well worth it if you want to eliminate any play in the shift feel.
When compared to a stock M3’s single-shear selector rod, the difference in quality is instantly noticed. This is one beefy unit! Not only will the steel construction add considerably more strength, but the fact that the double-shear setup spreads the load over two points at each end—as opposed to the factory unit, which puts the force at a 90 degree angle—will help promote greater precision and longer life for the bushings. This should ensure a new-like feel for years to come.
To remove the factory selector rod, simply flip the retaining clip at the front up with a flat head screwdriver and remove the pin.
To install the short shift kit you’ll be using the factory carrier. This piece modifies the factory carrier to accept the new UUC arm, and it also replaces that brittle, factory plastic pivot ball.
This is what it should look like from the side—notice it’s not totally straight at the top when looking at it compared to the top of the factory rod. But as long as the holes line up in the center you’re good to go. Torque them down gently with the supplied Allen key. I also used the supplied Loc-Tite on these small screws.