The Spicer TTC Gear Mainshaft (Back Taper), part number 49-8-20 or 49820, is a direct-replacement mainshaft gear for heavy-duty transmissions requiring a back-taper mainshaft configuration. This gear is sourced from Spicer TTC, a recognized name in commercial drivetrain components, and sold by Pro Gear and Transmission. The back-taper design is a specific geometric feature of the mainshaft that affects how the gear seats and transfers torque within the gearbox, making correct part identification critical before installation. Call us to confirm this part fits your transmission application before ordering.
Features
Spicer TTC brand mainshaft gear for heavy-duty transmission applications
Back-taper mainshaft geometry for proper gear seating and torque transfer
Part number 49-8-20 or 49820
Sold individually (each)
Available from Pro Gear and Transmission
