Nine-Inch Ford Truck Specifications
The Ford nine-inch differential is Ford's most popular and sought-after rear end differential. It came on several performance vehicles such as the Ford Mustang, and on pick-up trucks that included the Ford F-100 and F-150 pickups. The nine-inch appeared on the Ford Wagons during 1957 and on Ford pickups from 1958 up until the early 1990s.
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Visual Specifications and Major Differences
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Among several visual specifications readily noticeable on a Ford nine-inch are the size of the main carrier and the axle bearings, along with the number of splines on the axle shaft. Ford trucks had the larger axle bearings together with the 31-spline axle shaft. The axle bearings had a 1/2-inch fine thread and a 3/4-inch socket. These variants were more heavy-duty and the preferred choice of performance car technicians.
Gear Ratio and Dimensions
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Since the nine-inch ran for almost three decades, it went through several improvements and upgrades to its specifications. For the early models, its gear ratios ranged between 2.50:1 to 4.11:1, while truck variants ranged around 4.30:1. Today, some companies offer ring-and-pinion upgrades for the nine-inch with gear ratios that range from 2.75:1 and even up to 6.50:1.
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Removable Carrier with Positraction
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The Ford nine-inch was standard equipment as a removable carrier; this means that the whole rear end differential could come off the rear axle without disassembly of the whole axle system. Starting in the mid-70s, pickup trucks with the nine-inch came with Positraction, or "Limited Slip Differential" today. This allows the rear axle to automatically manage the torque on each wheel, allowing better performance during turns.
Case Identifications
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Three main popular case types appeared on the nine-inch carriers: the widely used C7AW-E, the N case D0OW-B and the WAR 4025. The C7AW-E was the variant on Ford trucks up until the mid-1980s, stronger than others because it was made with a different cast-iron material.
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