The 9-inch Ford Rearend is the Strongest Rearend Out There—It's All Due to “Hypoid Distance” 1] The 9-inch Ford has no differential case gear-ratio range restrictions; one differential accepts all gear ratios from the 2s through the 6s.
How strong is a 12-bolt rear end?
Chances are your truck has a 12-bolt rearend, but if not, it's fairly easy to get your hands on one. Not only are they common, but they can also be pretty solid when built correctly. In fact, they can stand up to around 800 hp, which is perfect for a street truck with some performance mods under the hood.
Is a Ford 9-inch stronger than a 12-bolt?
A Ford's 9-inch ring gear is larger than the 12-bolt's 8.875-inch ring gear. The Ford's larger ring gear plus its greater offset relative to the pinion results in a tooth contact area that's slightly deeper than a 12-bolt's, making the Ford marginally stronger.Apr 1, 1999
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.
Is a Chevy 12-bolt rear end good?
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 is the best differential for drag racing?
LSD (limited slip differential), is usually the answer, but for cars with dedicated for one single purpose and one single kind of race it is usually the locked differential, they're better off in drag racing, off-roading, and stuff like that when you need your power where the resistance is coming from.
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 all GM 12-bolt rear ends the same?
They are not interchangeable. That doesn't mean the truck rearend is not capable of receiving performance upgrades. To the contrary, aftermarket 30-spline differentials and axles are available. GM car and truck 12-bolt rearends are easily distinguishable by the cover shape.
What is the best rear end for street racing?
The Ford 9-inch rearend is easily the most popular in racing, but most Street Stock racers run a GM metric chassis like a Monte Carlo.
What is the best differential for performance?
Open Differential Open differentials are by far the most common differential encountered in production vehicles. They have great on-road manners and performance, and work well for most applications. They typically do not offer any appreciable resistance to speed or torque differences in driving conditions.
What is the best rear end ratio for drag racing?
If it's a daily driver, chances are you'll want to keep your gear ratio at 3.23 or below for optimal performance and lower cruising RPMs. For street and strip applications, a popular choice ranges between 3.42s and 3.90s, giving you that extra oomph on the track while maintaining a tolerable cruising RPM on the street.
What is a good dragracingrear end?
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 12-bolt rear end do I have?
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.
Why is the Ford 9-inch so strong?
The Ford's larger ring gear, in addition to its greater offset relative to the pinion, yields a tooth contact area deeper than a GM 12-bolt, making the Ford stronger. The 9-inch's pinion gear is supported in three places instead of two in the 12-bolt.
How much HP can 30 spline axles handle?
S/S Direct-Replacement C-Clip Axles (30-spline up to 450 hp1, 31-spline up to 500 hp1) The S/S C-clip axles are a direct replacement for OEM C-clip axles.
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.
Are all 12 bolts 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.