Quick Answer: How Do I Identify My Differential?

What is the best rear end for drag racing?

Ford 9″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..

Is a 10 bolt rear end good?

As long as your tires never completely hook when the power is applied from a dead start, such as at the drag strip, a weaker rear axle like the 8.2-inch 10-bolt will likely survive. That’s the short answer.

How do you tell if you have a Dana 50 or 60?

The 60 will have the number “248” cast in the web on the center chunk (248mm ring gear). The 50 will have a “229” cast in the web.

How do you identify a Ford differential?

The differential carrier tag contains the Dana model number and is located next to the driveshaft mount, facing forward on the passenger side of the housing. The model number is located on the top right hand corner of the tag, J210-S, for example. Locate the identification tag on Ford manufactured rear end units.

How do I know if I have a limited slip differential?

The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential. If it spins in the same direction, you have a limited slip differential, or LSD.

How do you tell if you have a 7.5 or 8.8 rear end?

How to Tell the Difference Between an 8.8 and a 7.5 Rear EndLocate the axle tag. It is attached to the rear differential cover by one of the bolts, usually the top middle one. … Note the three sets of numbers across the bottom of the tag. The middle number will be “7.5” or “8.8.” This is the size of the rear axle. … Place a drain pan under the differential.

How much horsepower can a Ford 8 inch rear end handle?

An 8 inch Ford rear axle was designed for use behind 6 cylinder and low power 8 cylinder engines. 175 hp to 275 hp max, with tor questions to match. The 409 engine your friend is installing will probably make 350 to 400 hp, and a lot of torque.

How much horsepower can a 10 bolt rear end handle?

about 450 HP7.5” 10 bolt GM rear: It will take up to about 450 HP IF the axle tubes are welded to the housing and either a differential cover with preload bolts is installed or straps are installed over the carrier bearing caps along with longer bolts.

How much horsepower can a 8.5/10 bolt handle?

The 10 bolt 8.5 can handle just about as much hp as the ford 9 inch. It just depends on your axles gears and posi.

What does 9 inch rear end mean?

Ford had other differentials that unbolted from the front, however, the term 9-inch refers to the outside diameter of the ring gear and Ford’s other third-member offerings has a pinion gear that was somewhat smaller. The 9-inch ring and pinion is front-loaded into the rear end housing.

How do you know what gear ratio you have?

Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio. Note: you may need to round off the number.

Why is the Ford 9 inch so good?

The 9-inch’s controversial rear pinion support bearing (arrow) is widely believed to enhance strength, but it may really be a Band-Aid because the traditional front two bearings are located too close together. As power levels increased, Ford realized that even the “third” pinion shaft support bearing was inadequate.

Where do I find my axle code?

Locate the “Vehicle Certification Plate” on the inside of the driver’s door near the door latch. The axle code is printed under “Axle” or “Ax.” You can use the chart provided in the first resource below to cross reference the axle code.

How do I identify my GM rear differential?

The rear cover’s shape and the number of bolts are identifying features for GM rear differentials. The round 10-bolt cover with a bulge for the ring gear identifies this axle assembly as an 8.5-inch 10-bolt. The two lugs on the lower case at the 5 and 7 o’clock positions are also identifying features.

How do I know what size rear end I have?

Measure the diameter of the ring gear. This measurement equals the size of your rear end. Count how many bolts are on the inspection cover. If you have 10 bolts, then your Ford has a 7.5-inch or an 8.8-inch rear end.

How do I identify my 8.5 gm rear end?

When looking at the housing from the rear, an 8.5 will have two squared off chunks of casting hanging on each side near the bottom of the differential. An 8.2 (shown) will have the same contour as the cover. Most 8.2 factory covers also have the strange protrusion at the top.