Introducing the 33-Spline PRO Series Center Spool Kit from Speed Tek Auto Racing. This kit is specifically designed for users seeking maximum horsepower who require the largest possible shaft size.
The billet half-shafts are manufactured from the highest grade 4340 chromoly currently available on the market. With an increased size and spline count, these shafts are capable of withstanding high torque and torsional stress, supporting over 1,500 BHP.
These kits are available in your choice of 5-bolt or 6-bolt (GT-R style) flange shafts.
Developed using 4140 chromoly billet material, they are machined to withstand high loads to ensure that the left and right wheels remain locked at all times. These are ideal for drag or drift applications where equal torque must be applied to both wheels to ensure optimal acceleration capability.
Weighing less than 5kg, this lightweight unit offers performance benefits by reducing rotational mass, resulting in improved acceleration and reduced drivetrain wear and tear.
Following machining, the unit undergoes a nitriding process to increase durability.
What is Nitriding?
A heat treatment process that diffuses nitrogen into the surface of metal to create a case-hardened surface. These processes are commonly used for low-carbon, low-alloy steels. They are also used for medium-carbon steel, high-carbon steel, titanium, aluminum, and molybdenum.
What are the benefits of the optional Isotropic Superfinishing?
It is a surface finishing process that creates an extremely smooth surface with minimal roughness. It helps extend the life of steel chromoly shift forks and allows them to operate more smoothly.
By creating an extremely smooth surface, it reduces friction between the shift forks and other components. This reduces wear and extends the service life of the shift forks.