1967 Chevelle 12 Bolt Posi. The 1967 Chevelle 12 bolt Posi 331 is a highly sought-after rear axle assembly by classic car enthusiasts. It is known for its strength, durability, and performance. The 12 bolt Posi 331 was used in a variety of high-performance Chevelle models, including the SS 396 and the SS 454.
What is a 12 Bolt Posi 331?
The 12 bolt Posi 331 is a rear axle assembly that is made up of three main components: the differential, the axle housing, and the axle shafts.
- Differential: The differential is the component that distributes power from the transmission to the axle shafts. The Posi (limited slip) differential in the 12 bolt Posi 331 rear axle assembly allows both wheels to spin at the same speed, even if one wheel is on a slippery surface. This helps to improve traction and handling.
- Axle housing: The axle housing is the component that holds the differential and axle shafts in place. The 12 bolt axle housing is made of cast iron and is very strong. It is also wider than the axle housing used in other Chevelle models, which provides additional stability.
- Axle shafts: The axle shafts are the components that connect the differential to the wheels. The 12 bolt axle shafts are made of high-strength steel and are very durable.
GM Casting Number 3894939
The GM casting number 3894939 is the casting number for the differential housing used in the 1967 Chevelle 12 bolt Posi 331 rear axle assembly. The casting number is located on the bottom of the differential housing.
Why is the 1967 Chevelle 12 Bolt Posi 331 so desirable?
There are a number of reasons why the 1967 Chevelle 12 bolt Posi 331 is so desirable:
- Strength and durability: The 12 bolt Posi 331 rear axle assembly is very strong and durable. It is capable of handling a lot of power and torque, making it ideal for high-performance applications.
- Performance: The Posi differential in the 12 bolt Posi 331 rear axle assembly improves traction and handling, making it ideal for performance driving.
- Rarity: The 1967 Chevelle 12 bolt Posi 331 rear axle assembly is relatively rare. It was only used in a limited number of high-performance Chevelle models, which makes it even more desirable to collectors.
Where to Find a 1967 Chevelle 12 Bolt Posi 331
1967 Chevelle 12 bolt Posi 331 rear axle assemblies can be found in a variety of places, including:
- Classic car parts stores
- Online retailers
- Online auction sites
- Swap meets
When purchasing a 1967 Chevelle 12 bolt Posi 331 rear axle assembly, it is important to inspect it carefully for any signs of damage or wear. It is also important to make sure that the differential housing has the correct GM casting number (3894939).
The 1967 Chevelle 12 bolt Posi 331 rear axle assembly is a highly sought-after component by classic car enthusiasts. It is known for its strength, durability, and performance. If you are looking for a high-performance rear axle assembly for your 1967 Chevelle, then the 12 bolt Posi 331 is a great option.