8L90 Performance Transmission Billet Input Shaft (2015 & Up)
Upgrading your GM 8L90 transmission with a billet input shaft is one of the most effective ways to add strength and reliability. Our 8L90 transmission billet shafts are precision-machined from 300M alloy steel and heat treated for exceptional durability. Designed as a drop-in replacement, these shafts come complete with sealing rings pre-installed, eliminating the need for additional tools or installers. FREE UPS Ground to the contiguous United States (lower 48)
In stock items ship within 1-2 business days.
Picture for representation purposes only. Actual contents may vary as we continue to develop our products.
Why Choose a Billet Input Shaft for Your 8L90?
- Maximum Strength: Machined from 300M alloy steel for unmatched durability.
- Heat Treated: Enhanced resistance against fatigue and twisting under load.
- Improved Radius Design: Reduced breaking points between sealing rings.
- Drop-In Ready: Pre-installed sealing rings save time and money on installation tools.
- Trusted Performance: Built for high-horsepower applications, towing, and racing.
Fitment Considerations for the 8L90 Transmission Billet Shaft
The 8L90 transmission has multiple versions of input shafts depending on model year, application, and torque converter design. To ensure proper fitment, please verify the following before ordering:
- Model Year & Vehicle – Early vs. late model 8L90 units use different shaft styles.
- Spline Configuration – Confirm whether your transmission uses the early-style or late-style spline count.
- Torque Converter Compatibility – Match your shaft to the correct converter hub size and spline design.
How to Verify Your Shaft Before Ordering
- Check the Build Tag or Serial Number on your transmission.
- Measure and Count Splines on your existing input shaft.
- Send Photos for Verification – Text a clear photo of your input shaft and converter hub to 713-895-7019, and our team will confirm fitment before you purchase.
This extra step saves downtime, eliminates costly returns, and ensures you get the right billet shaft the first time.
Shipping Information
All 8L90 transmission billet shafts include FREE UPS Ground shipping within the continental United States.
Frequently Asked Questions About 8L90 Transmission Billet Shafts
What is the advantage of upgrading to a billet input shaft in the 8L90 transmission?
A billet input shaft significantly increases strength compared to stock, reducing the risk of twisting or breaking under high torque loads. It’s especially important for racing, towing, or performance builds.
Do I need special tools to install the 8L90 transmission billet shaft?
No. Our billet shafts are a drop-in part with sealing rings pre-installed, so you don’t need a sealing ring installer or sizing tools.
How do I know if I need the early-style or late-style 8L90 billet shaft?
The easiest way is to check your transmission’s build tag, count the splines on your existing shaft, or text us a photo of your shaft and torque converter hub. This ensures the correct match for your application.
Will a billet input shaft work with aftermarket torque converters?
Yes. As long as the spline count and hub size match, a billet input shaft will work with both stock and aftermarket converters. Confirm compatibility before ordering to avoid delays.
Is a billet input shaft necessary for a stock 8L90 transmission?
For daily driving and light use, a stock input shaft may be sufficient. However, if your vehicle is tuned, making high horsepower, or used for towing or racing, upgrading to a billet shaft provides crucial durability and peace of mind.
