Transmission Specialties 4L80SH 300M Hardened Steel Input Shaft for GM 4L80E

Upgrade the durability and performance of your GM 4L80E automatic transmission with the Transmission Specialties 4L80SH 300M Input Shaft. Designed for demanding street, racing, and performance applications, this hardened steel shaft provides increased strength compared with a standard factory input shaft. Its robust construction helps support higher torque loads and improved reliability in transmissions subjected to hard acceleration, frequent shifting, or increased engine output.
The Transmission Specialties 4L80SH is manufactured from high-strength 300M material and heat treated for enhanced resistance to twisting, wear, and fatigue. The precision-focused design is intended to maintain proper fit and dependable power transfer through the transmission input assembly. This replacement shaft is a practical choice for builders upgrading a GM 4L80E transmission as part of a performance rebuild or drivetrain reinforcement project.
Feature: 300M high-strength steel construction
Feature: Hardened for improved durability and wear resistance
Feature: Designed for GM 4L80E automatic transmissions
Feature: Helps handle increased torque and performance demands
Feature: Direct replacement-style input shaft for transmission rebuilding and upgrades
Feature: Supplied as an individual shaft
The Transmission Specialties 4L80SH 300M Input Shaft is engineered for enthusiasts, transmission professionals, and performance builders who need dependable input-shaft strength without unnecessary complexity. Verify transmission application and compatibility before installation, and follow proper rebuilding procedures to ensure correct fitment, alignment, lubrication, and operation. With its hardened 300M steel construction, this input shaft is a reliable foundation for strengthening a GM 4L80E transmission used in high-performance or heavy-duty service.

Features:

• 300M high-strength steel construction

• Hardened for improved durability and wear resistance

• Designed for GM 4L80E automatic transmissions

• Helps handle increased torque and performance demands

• Direct replacement-style input shaft for transmission rebuilding and upgrades

• Supplied as an individual shaft