Description
Product Overview
The USA Standard Manual Transmission Bearing Kit (model ZMBK115) is engineered for durability and precision. Constructed from a solid cast iron case, it houses high‑quality bearings that support the main shaft of Saginaw manual transmissions. The kit includes a seven‑bolt side cover, a 9.75‑inch long main case, and machined components that meet OEM specifications. Weighing just 3 pounds and measuring 11 x 13 x 3 inches, it offers a compact yet robust solution for transmission repair and replacement.
Usage
Designed for professional mechanics and experienced DIYers, this bearing kit is ideal for rebuilding manual transmissions in trucks, vans, and off‑road vehicles. It fits models that do not require an overdrive gear, making it perfect for heavy‑load applications where reliability is critical. Installation can be performed in a standard garage with common tools, and the machined exterior ensures a snug fit that minimizes vibration and wear.

Why Choose Us
USA Standard is a trusted American manufacturer known for rigorous quality control and precision engineering. Each bearing kit undergoes thorough testing to guarantee dimensional accuracy and material integrity. Our commitment to using cast iron and precision‑machined parts ensures longevity, even under demanding conditions. When you choose this kit, you receive a product backed by a reputation for reliability and performance.
Key Features
- Cast iron case provides superior strength and wear resistance.
- Seven‑bolt side cover ensures secure mounting and easy removal.
- 9.75‑inch long main case fits standard Saginaw transmissions without overdrive.
- Machined components deliver precise tolerances for smooth operation.
- Lightweight design (3 lb) simplifies handling and installation.
FAQ
What transmissions are compatible with this kit?
The ZMBK115 kit is compatible with Saginaw manual transmissions that use a cast iron case and do not require an overdrive gear. It is commonly used in medium to heavy‑duty trucks and vans.
Do I need special tools to install the kit?
Standard hand tools such as a socket set, torque wrench, and pry bar are sufficient. No specialized equipment is required for installation.
Is the kit covered by a warranty?
Yes, USA Standard offers a one‑year limited warranty covering manufacturing defects and material failures.
Can this kit be used for performance upgrades?
While primarily designed for replacement, the high‑quality bearings and robust case can support modest performance enhancements in manual transmissions.
How does the cast iron case benefit the transmission?
Cast iron provides excellent durability, heat dissipation, and resistance to deformation, extending the service life of the transmission under heavy loads.








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