- Carbon Lined Replacement Blocker Rings
- Fits TKO 500 / 600, 3550 Transmissions
- Dramitacally Increase’s Higher RPM
- Improves Shift Quality
- Recommended To Use GM or Pennzoil Synchromesh Oil
- Sold Individually
Improves Shifts. This HMS Carbon Lined Block Ring is a must-have mod for your vehicle whether it sees mostly daily driver duty or serious track time. Using an innovative carbon design that makes each shift better and faster. Dramitacally raises shifting RPM’s by eliminating the notching during shifting!