Description
Built for high-performance ZF 8HP automatic transmissions, the SPOOL Billet Main Shaft was developed over three years to provide a purpose-built solution for demanding power applications.
CNC machined from billet 300M steel, this main shaft is engineered with a focus on strength, precision, and consistency. The shaft features extremely tight-tolerance machined splines that are carefully checked for proper fitment and engagement.
For improved surface durability, the SPOOL Billet Main Shaft is nitrided for surface hardening, creating a hard, wear-resistant outer surface while retaining the underlying strength of the 300M steel material.
After three years of development, testing, refinement, and machining, SPOOL designed this shaft to provide a robust upgrade for compatible 8HP transmission applications.
Key Features
- Billet main shaft designed for ZF 8HP transmissions
- CNC machined from billet 300M steel
- Developed over three years
- Extremely tight-tolerance machined splines
- Splines carefully checked for proper fitment and engagement
- Nitrided surface treatment for increased surface hardness
- Wear-resistant hardened surface
- Retains the underlying strength of 300M steel
- Designed for serious high-power applications
- Precision-focused machining and quality control
Specifications
- Brand: SPOOL
- Product: 8HP Billet Main Shaft
- Material: Billet 300M Steel
- Manufacturing: CNC Machined
- Surface Treatment: Nitrided
- Spline Design: Tight-tolerance machined splines
- Application: ZF 8HP Automatic Transmissions
- Development: 3 Years
Transmission Fitment
ZF 8HP45 / 8HP50 / 8HP51
- ZF 8HP45
- ZF 8HP50
- ZF 8HP51
ZF 8HP70 / 8HP75 / 8HP76
- ZF 8HP70
- ZF 8HP75
- ZF 8HP76
What's Included
- SPOOL Billet Main Shaft for the selected compatible 8HP transmission
Installation
Professional transmission installation is strongly recommended. Proper disassembly, inspection, assembly, and verification of transmission components should be performed by a qualified transmission specialist to ensure correct fitment and operation.
Verify your exact transmission model and configuration before ordering.
Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.
