Honda K Series Countershaft Low Gear 23421-PPP-000

Honda K Series Countershaft Low Gear - Genuine OEM (23421-PPP-000)

Does your K-series fight you every time you grab first? Grinding on the way in, popping back out, or just feeling rough and notchy when you're trying to crawl through a parking lot? That's a worn low gear talking, and this is what shuts it up. Honda 23421-PPP-000 is the genuine countershaft low gear, your first gear on the countershaft side of the box. It's the gear that catches all the abuse, every launch, every red light, every slow crawl runs straight through it, so it's almost always the first one to give out. Drop a fresh one in and that low-speed clunkiness you've been putting up with finally goes away.

Here's Why First Gear's Always The One That Goes

Think about what first gear actually does for a second. It's the one yanking your car off the line from a dead stop, soaking up every clutch drop, taking the whole load of getting all that weight rolling. Your other gears? They're just cruising. First gear's the one down in the trenches. So when your transmission only acts up at low speed, grinding into first, fighting you on the engagement, feeling notchy at a crawl, this is usually your culprit. The teeth wear, the engagement edges round off, and you feel every bit of it right where this gear does its work. Swap it out and you get that crisp, dropped-right-into-gear feel back.

If You're Going In, Go In Once

Real talk: the gear's cheap, but getting to it sure isn't. Your transmission's got to come all the way out and get split open to reach this thing, so you really don't want to be doing that twice. If you're already in there, rebuilding, chasing down a grind, or freshening up a tired high-mile box, now's the time. And while you've got it apart, give your synchros, your shift forks, and the matching mainshaft gear a good look, because a worn low gear rarely shows up alone. Knock it all out in one go and you're done, not back under the car next month wishing you'd done it right the first time.

Don't Cheap Out On The Gear Itself

This is the spot where a bargain part really bites you. A gear has to mesh dead-on with everything else spinning in your transmission, and one that's even a hair off on tooth shape or hardness won't run clean and won't last. This is the real Honda piece, cut and hardened exactly how it needs to be, so it drops right into your gear set and just works. You're already going through the trouble of pulling a whole transmission, so the last thing you want is to tear back into it because you tried to save a few bucks on the one part doing the hardest work in there.

What You Get

• Genuine Honda countershaft low gear (23421-PPP-000)
• First gear on the countershaft for K20 and K24 transmissions
• Direct OEM replacement, cut and hardened to factory spec
• Addresses grinding, notchiness, and rough engagement at low speed
• Best replaced during a transmission rebuild or refresh
• Sold individually

Fits These Cars

• 2006-2011 Acura CSX
• 2002-2006 Acura RSX
• 2004-2008 Acura TSX
• 2003-2007 Honda Accord
• 2006-2011 Honda Civic Si

Note: Genuine Honda countershaft low gear, part number 23421-PPP-000, the first gear on the countershaft for K20 and K24 manual transmissions, including the K20A2, K20A3, K20Z1, K20Z3, K24A2, K24A4, and K24A8. Cut and hardened to factory specification for correct mesh and durability. A worn low gear can cause grinding, notchiness, and rough engagement at low speed, so it's a common item to replace during a transmission rebuild or refresh. Installation requires removing and disassembling the transmission, professional installation recommended. Sold individually. Fits the 2006-2011 Acura CSX, 2002-2006 Acura RSX, 2004-2008 Acura TSX, 2003-2007 Honda Accord, and 2006-2011 Honda Civic Si. One gear per order.