19554-010 Posi Differential for 1964-72 GM Car

Name: 19554-010 Posi Differential for 1964-72 GM Car
Brand: EATON
SKU: 362-19554-010
Price: 750.99 USD
Availability: InStock

^$750⁹⁹

Ships on Sep 08, 2026

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^$345⁰⁰

555-62812

Posi Traction Differential for GM Passenger Car 12-Bolt, 30-Spline [3.08 to 3.90 Ratio]

^$405⁹⁹

GM 12-Bolt

1964-72 GM Car
30-Spline Axles
8.875'' Diameter Ring Gear
Fits 3.08-3.90 Gear Ratios (3-Series)

Eaton 19554-010 Posi Differential Features:
Carbon Friction Technology
Precision-Forged Gears
Automatic/Rebuildable
Prevents Wheel Slip
Virtually Bullet Proof
Fully Rebuildable w/Specially Formulated Clutch Kit

FAQ

How does Eaton posi work?

The Eaton Posi unit, such as the popular model 19554, operates as a limited-slip differential designed to enhance traction and control. Inside the differential, the Eaton Posi uses a series of friction discs and preload springs. When torque is applied, these components engage, transferring power to both rear wheels for improved traction. This design allows the Eaton Posi to automatically provide additional power to the wheel with better grip, making it an effective solution for high-performance and off-road applications.

What is a posi unit?

A Posi unit, short for positraction, is a type of limited-slip differential designed to address traction challenges in rear-wheel-drive vehicles. The Eaton Posi unit, exemplified by model 19554, utilizes a gear-driven mechanism to distribute torque between the rear wheels. This helps prevent wheel spin, providing better traction and stability, particularly during acceleration and cornering. The Posi unit enhances overall performance and control in various driving conditions.

What is better Posi or limited slip?

The terms "Posi" and "limited slip" are often used interchangeably. In fact, a Posi unit, like the Eaton Posi 19554, is a type of limited-slip differential. Both Posi and limited-slip differentials aim to improve traction by distributing torque between the rear wheels. The Eaton Posi, with its proven design, offers excellent performance and is considered a reliable and effective choice for enthusiasts seeking enhanced traction and control.

Can you convert a rear end to posi?

Yes, it is possible to convert a rear end to a posi unit using aftermarket solutions like the Eaton Posi 19554. This conversion involves replacing the existing differential with a posi unit to enhance traction and provide the benefits of a limited-slip differential. The conversion process requires careful installation, and it's essential to choose a reputable and reliable product like the Eaton Posi for optimal performance and durability in your rear differential.

Eaton Posi prevents wheel slip before it can get started. To do that, carbon disc clutch packs, preloaded by a central spring assembly, are located behind each differential side gear. When torque input increases, clamping load on the clutch packs increases. That causes the chatter-free clutch packs to grab and transfer power to the other wheel. Eaton Posi units are rebuildable. Muscle cars, hot rods and mild off-road vehicles should look to Eaton's limited-slip differential for their traction answers. And the fact is, Eaton's Posi units are virtually bulletproof.

Eaton Posi Differential Kits Include: