Actually your response is DUMB and uneducated. Try reading this:
LOW PINION D30:
This axle made its debut, much to the chagrin of enthusiasts, in 2000. This axle uses geometry common to rear axles. The pinion rides below the ring gear centerline, and when used in a rear application, rides on the drive side of the gear. However, when used in a front application, the pinion rides on the coast side of the gear when driving forward. The coast side of a gear set has a greater slope to it than the drive side, so this accentuates our problem of ring gear deflection described above. When driving on the coast side of a gear, the ring and pinion is about 25% weaker than when running o the drive side. A reverse spiral gear as found in earlier XJ axles solved this problem by cutting the ring gear with the drive and coast side of the gear swapped. This design was conceived by Dana and Ford in the late 60’s to improve driveline angles and strength in their front axles. It does both well. In a sense, the 2000 and 2001 model axles are a de-evolution in technology.
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