Quick Answer

Your Question What’s better 10 bolt or 12 bolt rear end?

First, the 10-bolt’s pinion shaft diameter is 1.438 (25 splines) while the 12-bolt is 1.625 (30 splines) which makes the 12-bolt 13 percent larger in diameter and therefore stronger.

Are 10 bolt and 12 bolt axles the same?

12 bolt axles have 30 splines, 10 bolt have 28, but yet both axles are the same lenth and diameter. That means that if the 10 bolt had a 30 spline carrier the 12 bolt axles would bolt in.

What is the advantage of a 12 bolt rear end?

When the 12-bolt rearend is properly assembled, it’s the strongest passenger-vehicle rearend Chevy ever produced. GM engineers designed the 12-bolt to be a durable piece that could handle the torque output of its big displacement engines.

What does a 12 bolt rear end mean?

The GM 12-bolt rear axle assembly receives its name due to having 12 bolts on the rear cover of the housing. This rear axle was available in GM’s high-performance intermediate cars, full-size vehicles and light-duty trucks.

Is Posi the same as limited slip?

Registered. Posi and limited slip are both the same thing. Standard rear end “Peg leg”, both back wheels always propel the car but the power goes to the wheel that spins the fastest. So if one side spins out, all the power goes to that wheel..

Are all 12-bolt rear ends the same?

A different 12-bolt differential was used for light truck applications, but those 12-bolt units are not directly interchangeable. You can identify a truck differential by the smaller, 1.438-inch diameter pinion shaft and the size of the rear cover, measuring 10.875 inches by 10.875 inches.

How much horsepower can a 8.2 10-bolt handle?

Roughly 550 to 600 HP total. No slicks, drag radials. No problems with the 8.2 at all. I used the stock diff., the Auburn would be better.

How strong is a Chevy 10-bolt rear end?

The smaller 7.5- and 8.2-inch 10-bolt rear axles can’t transmit horsepower loads in excess of 400 hp. However, the 8.5- and 8.6-inch 10-bolts are extremely stout and effective rear differentials that can transmit up to 1,000 hp to the rear wheels.

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 is the strongest rear end?

Dana 60 Rear End Assemblies

If you want a big brute of a rear end under your car, look no further than a Dana 60. Even in the heyday of muscle cars, Dana 60 rear differentials were renowned for their strength, along with their difficulty to locate.

What’s the best rear end for drag racing?

Ford 9″– The Ford 9″ is definitely the most popular of the rear ends in drag racing. It offers good strength characteristics and the largest variety of gear choices. The thirdmember type center section allows a racer to have multiple gear ratios available and is much easier to change than a rear loading type rear end.

What is a good gear-ratio for a street car?

If we have a daily driver, 2.55 to 3.25 gear ratios typically work best, whereas a street/strip application we would usually use a 3.42 to a 3.90 gear ratio, and race applications most commonly use a 4.10 and above gear ratios.

What size is a GM 12 bolt rear end?

GM 12 Bolt Specs

Applications: 1964 – 1982 Chevrolet & GMC 1/2 ton to 3/4 ton trucks
Ring Gear: 8.875″
Axle Spline Count: 30 spline
Axle Tube Diameter: 3.00″
Pinion Diameter: 1.625″

What gear ratio is a 12 bolt rear end?

A wide variety of aftermarket gear ratios are available and Strange carries many GM 12 Bolt 8.875 gears in stock.

How do I identify a Chevy 10 bolt rear end?

The easiest way to identify the 8.2-inch rearend at a glance is by the shape of the housing and the spacing between the lower bolts on the cover. The 8.2-inch 10-bolt has a smooth, round, lower-case area (no cast-in protrusions), with an 11-inch cover that has a diagonal protrusion at the top.

Is Posi Trac better?

In a positraction differential, the unit senses which wheel has the greatest traction, when one tire is slipping or stuck, and sends power to that wheel. Power to the other wheel continues until equal control is returned to both tires. Positraction is beneficial when road conditions are wet or muddy.

Which is better limited slip or locking differential?

Limited slip differentials provide your vehicle with the best traction around. Locking differentials might give you good traction too, but the traction that you will experience with limited slip differentials is better. For starters, they will make it easier to turn on roads which are slippery and wet.

What cars came with posi traction?

GM has offered Positraction rear ends since 1957, and its 8.875-inch 12-bolt Positraction was most popular in Chevrolet passenger cars from 1965 to 1972. Pontiac offered a version of a Positraction unit, called Safe-T-Track, as an option on vehicles including the 1963 Pontiac Tempest.

What is a GM 10-Bolt?

The GM 10-Bolt semi-floating rear axle has been in use for over 40 years. It’s been used in passenger cars, and light duty pickups and SUVs over the decades.

How do I know what GM rear end I have?

Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box.

Did Pontiac make a 12-bolt rear end?

Although Buick, Pontiac and pre-’67 Oldsmobiles used the same basic 8.2-inch 10-bolt differential (1967-’70 Oldsmobiles used the Olds-specific 12-bolt 8.5-inch differential), these are different from the Chevrolet 8.2 10-bolt offerings.

How do you narrow a GM 10 Bolt?

Dave, You can narrow a 10 bolt by getting a donor rear (8 3/4 Mopar works good) and narrow the donor axles and put the chevy spline on the end. Then use the donor axle housing ends, brakes, etc and you have a much stronger rear and bigger brakes.

Will a Tahoe rear end fit a Silverado?

No. You shouldn’t try fitting a Silverado differential into a Chevy Tahoe.

Does Ford have a 10-bolt rear end?

There are two headings, one for Ford-manufactured units and a separate one for Dana/Spicer units. Ford 7.5 and 8.8-inch units both have 10 bolts, however, the cover and gasket shapes are different. Similarly, the Dana 35 and 44 models have ten bolts with different cover and gasket shapes.

What size is the pinion nut on GM 10-Bolt?

PYN10 – 10-Bolt 8.5″
Pinion Nut (30 Spline Pinion)