Honda - Genuine Honda OEM K-series Main-Shaft / Input Shaft Transmission Ball Bearing | 91001-PPP-005

Honda 91001-PPP-005 is a precision ball bearing designed to support and accurately locate the transmission mainshaft while allowing it to rotate smoothly at high speed with minimal friction. Installed within the manual transmission case, the bearing carries radial loads generated by the rotating shaft and geartrain while helping maintain proper shaft alignment and gear positioning. Honda catalogs specifically describe this bearing as being for the mainshaft, and it is also commonly listed as a manual-transmission input-shaft bearing. 

 This is an important internal transmission component because the mainshaft must remain precisely supported as engine torque passes through the transmission. The bearing’s hardened inner and outer races and rolling steel balls provide a low-friction interface between the rotating shaft and stationary transmission housing. By supporting the shaft and controlling its position, the bearing contributes to smooth gear operation, proper engagement and overall transmission durability.

Why this bearing is important

The bearing may look simple, but it performs a critical mechanical job. It supports a major rotating transmission shaft while reducing friction and maintaining alignment. Excessive bearing wear or play can allow unwanted shaft movement, which can contribute to noise, vibration and abnormal loading of other transmission components. In severe cases, continued operation with a damaged bearing can contribute to additional internal transmission damage.

Because 91001-PPP-005 is a specific 28×64×15 mm OEM bearing, correct fitment matters—not merely finding another bearing that appears to have the same dimensions. Honda/Acura catalogs show the part across multiple manual-transmission applications, including certain Accord, Civic/Si, CR-V, RSX, TSX and ILX configurations, but fitment varies by year, model and transmission. 

Ref No. 8 in the diagram pictured

Vehicle Fitment

• 2013-2015 Acura ILX
• 2002-2006 Acura RSX
• 2004-2014 Acura TSX
• 2003-2012 Honda Accord
• 2002-2006 Honda CR-V
• 2002-2015 Honda Civic
• 2003-2010 Honda Element

LOCATION: BIN A-38