The most accurate differential identification is provided by the bottom line of the tag number or axle tube stamp. Differential tags can easily be used to identify Dana and Ford differentials.
Also you can tell by the diff cover shape. There’s pictures online. Basically if it’s symmetrical then it’s the 8.8.If it’s tapered on one side it’s the 9.75.
How do I identify a Ford 8.8 rear end?
You can identify the Ford 8.8-inch rear by its rear cover. It has a thin metal or plastic 10-bolt cover, and the bolts are 7/16-inch thread. The cover is not quite square, measuring about 101/2 inches high by 11 inches long. The 8.8-inch pinion shaft is 15/8 inches and has 30 splines.
How do I know what Ford Diff I have? – Related Questions
How do you tell the difference between a Ford 8.8 and 9?
How do you decode a Ford rear end tag?
What vehicles have a Ford 8.8 rear end?
Common Applications
1986-2014 Ford Mustang.
1982-2012 Ford F-150.
1982-1996 Ford Bronco.
2001-2005 Ford Explorer Sport Trac.
1991-2011 Ford Ranger 4.0L models.
1991-2001 Ford Explorer (Solid axle)
1985-2011 Ford Panther platform vehicles.
2012–Present Ford F-150 (Super 8.8, depending on engine and other options)
What VIN number is my rear end gear ratio?
The gear ratio is usually listed in the VIN code located on driver’s door, the glove box, or the ID plate on the dashboard. Count the times a rear wheel goes around for one driveshaft turn: if its 3 1/2 it’s a 3.50:1.
Is limited slip and posi the same?
Limited Slip Differentials (LSD) significantly increase the traction and performance of Jeeps, trucks, 4×4s, and RWD vehicles on the street, at the strip, or on the trail. Positraction is what General Motors called its limited slip differential, the term has come to refer to LSDs in general.
How strong is a Ford 8.8 rear end?
This rearend is lighter than a 9-inch and is as strong as a 12-bolt (except for the axles), and many Mustangs came from the factory with Traction-Lok limited-slip differentials.
Are all Ford 8.8 differentials the same?
There are 24 different Fords that offered the 8.8 rear axle. The weakest points of the 8.8 are the 28-spline axles (1.18 inches in diameter). The 31-spline axles (1.29 inches in diameter) are more desirable but far less common.
The Ford 9-inch is desirable because it has a removable carrier, which allows quick rear end changes. Many racers carry an extra carrier assembly with a different rear end ratio so they can try different combinations on the same day while at the track.
And the fact is, Eaton’s Posi units are virtually bullet proof.
Ford 8.8″ Eaton Posi – Limited Slip Differential.
Differential:
Ford 8.8″
Axle Splines:
31
Ring Gear Bolts:
10 (not included)
Manufacturer:
Eaton
Warranty:
1 Year
1 more row
What gear ratio does a Ford 8.8 have?
Ford 8.8 Inch 3.55-5.13 Ratio.
How much HP can a Ford 9 inch handle?
“They’re good only to 400hp max,” says Tom at Tom’s Differentials. “Anything above that should use today’s beefed-up, redesigned, nodular-iron aftermarket cases. They’re good to 800 hp, if built properly.
What’s the difference between 28 spline and 31 spline?
31 spline axles which are about 30% stronger than the 28 spline axles making them a popular aftermarket upgrade for Fox, SN95, and New Edge Mustang owners.
Why is it called a 9 inch rear end?
The Ford 9-inch rear end, so named because of its 9-inch ring gear diameter, was manufactured from 1957 to 1987 by the Ford Motor Company and installed in some intermediate and most full-size Ford, Lincoln, and Mercury passenger cars, F-Series ½-ton trucks, and Econoline vans.
Additionally, the Dana 60 (S60) from Strange comes equipped with their beefy 35-spline alloy axles and carrier that can handle over 1,000 horsepower. A vintage Dana 60 like ours with its stock 23-spline axles and clutch-type Sure-Grip is limited to roughly 700 horsepower of sticky tire, strip action.
Which is stronger Dana 60 or Ford 9 inch?
The Ford 9-inch pinion is mounted lower in the carrier and has the greatest hypoid offset, which causes it to consume more power to drive it than the Dana 60 or GM 12-bolt. The Dana 60 has so much mass it too consumes a lot of power to drive (although many say it feels slightly less than a 9-inch Ford).