How do I identify a GM 12-bolt rear end?

The easiest way to identify a 12-bolt rearend is obviously by the 12 bolts holding the rear cover onto the axle housing. The pinion shaft on passenger-car differentials is 1-5/8-inch in diameter and the cover is oval, measuring 10-15/16-inches wide by 10-5/8-inches tall.

What size ring gear is in a GM 12-bolt rear end?

8.875-inch
12-Bolts to Glory The GM 12-bolt debuted in 1965 and was mass-produced until 1972. It features an 8.875-inch ring-gear carrier held in place with two internal main caps. The pinion gearshaft measures 1.625 inches in diameter and is shimmed to achieve the proper pinion depth.

How much horsepower can a 12-bolt rear end hold?

In fact, they can stand up to around 800 hp, which is perfect for a street truck with some performance mods under the hood. Thirty-spline axles and a large ring gear help these rearends hold power. They also require less power to turn because of the height where the pinion gear contacts the ring gear.

Why is a 12-bolt rear end good?

The 12-bolt positions the pinion-gear higher on the ring gear, which reduces the load on the pinion. This results in less parasitic loss from the friction caused as the gears mesh. Introduced in 1964, the 12-bolt rearend became a staple for Chevrolet racers.

How do you decode a 12-bolt rear end?

12-Bolt Housings by the Numbers The casting numbers are simple to decode. The first letter is the month of the year; A is January, B is February, and so on. The next digit is the day it was built, and the last digit is the year it was built. For example, a 12-bolt axle that was built on March 28, 1967, is C287.

How much horsepower can a 12 bolt rear end hold?

How do you decode a 12 bolt rear end?

Why choose differential rear end support covers?

Differential rear end support covers provide strength as well as good looks over stock rear end covers. Choose from differential rear end support covers for Chevrolet 12 bolt & 10 bolt, 8.8, Dana 60, Ford 10 bolt and others. JEGS carries a great selection of differential covers from Trans Dapt, Mr. Gasket, Granatelli, Ford Racing and more!

How do I identify a strange 12-bolt rear end?

Each Strange 12-bolt rear-end bears the set-up technician’s signature and date of build on the edge of the ring gear. The Strange GM 12-bolt rear end is available in any state of completion from a bare housing to a fully built differential (for certain popular applications).

What are the dimensions of a Ford differential cover?

Differential Cover, Ford 9.75 in. Axle, Nodular Iron, Silver Hammertone Powedercoated, Each Differential Cover, Aluminum, Black Powdercoated, GM, 8.875 in., Passenger Car, Kit

What kind of rear end does a Chevy Strange have?

This durable Chevy 12-bolt rear end may also be purchased with no mounts or with leaf spring mounts to fit other high-performance applications. Strange utilizes cutting-edge Mazak machinery and the best people in the industry to maintain consistent quality and durability in all their rear ends and rear end parts.