Wider 3-4 pocketed dog gear to tighten up the 3-4 shift and get full engagement on the dog of the gears, wider and stronger to prevent fork burning.. used in the fastest transmissions in the planet fits 2007-2024 cruise drives  

if you repair your own trans you must ensure proper side clearance after install, tip trans completely upright (main shaft to the sky) rotate and check side clearance, if it clears without rubbing , flip trans downward (mainshaft on table) rotate trans and make sure the fix has some side play before hitting dogs, if its rubbing or hitting contact us for a fix.,, in halreys quest for cheap manufacturing we have found some of the tolerances on drums, forks and locators are way off and it will make the fix rub on the dogs, which will accelerate wear on face of dogs. call with any questions