A lockup torque converter was added in the early 80s, creating the C5. Improvements were made in 1970, increasing internal strength and reliability. This was changed to a D-2-1 shifter in 1967. Early versions were designed with the option of staying in second gear. It was paired with larger straight 6's and small block V8's like the 302 the 5.0 is based on. This three-speed replaced Ford's first automatic, the Ford-O-Matic, back in 1964. Looking to swap a Coyote into your Fox body? Performance Automatic makes a high strength AOD specifically for this application with the right bellhousing as well as a wiring harness and computer. Over time, development of this transmission cured this issue, while robust components borrowed from the FMX transmission used with older big blog Fords make this a great starting point for a performance-oriented build. The automatic used in 5.0 Mustangs, this transmission was notorious for issues with the overdrive gear, causing the transmission to hunt between third and fourth on the highway. Better versions were introduced in the 1990s, but its limitations make it inferior to other transmissions that will easily fit in the Fox body. Although basically a C3 with an added overdrive, it's a fairly weak transmission, especially in the form used with the 2.3l. This automatic was used in four cylinder Mustangs as well as Rangers, Bronco II's and Explorers. A heavy-duty version is available from Ford Racing, while Tremec, the company that bought Borg Warner's manual transmission division, still makes the standard T5. This transmission was used in production vehicles for 30 years in everything from AMC Spirits to the 2010 V6 Mustangs, which means there's a wide range of gear options and parts available. These transmissions have some minor refinements over earlier versions including the use of needle bearings on some output shaft gears for decreased drag. A “Cobra Spec” version offered in '93 Mustang Cobra is rated at 310 ft-lbs. of torque, 86-89 5.0 transmissions at 265 ft-lbs, and 90-93 5.0 transmissions, which use stronger gears and revised syncros, at 300 ft-lbs. In stock form, the 2.3l version is rated at a maximum 240 ft-lbs. The version used with the 2.3 liter has weaker syncros and different gearing than the one fitted to the 5.0. It has 5 forward gears and an unsynchronized reverse. This Borg Warner transmission was used in all Fox bodies from 1983 onward. Fortunately, there are several transmission options that can handle the most radical builds from rebuilt stock units to complete aftermarket gearboxes. It's not hard to set up an engine that makes significantly more power than your Fox body was built with, and that puts a serious strain on the drivetrain.
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