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Transfer Cases
The Durango offers a full-time transfer case - model NV 242 - as optional equipment; the first such transfer case on a Dodge vehicle. The NV 231 part-time transfer case, which is also used on Dakota, is standard. Full-time four-wheel drive allows the vehicle to be driven anywhere at any time in this range.
On the other hand, part-time four-wheel drive can be used on relatively low traction surfaces such as sand, gravel, snow or ice but is unsuitable for operation on dry pavement.
The planetary differential between the front and rear drive shafts of the NV 242 transfer case permits full-time operation. |
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Dodge Durango
Transfer Case NP231
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The differential allows front and rear axles to turn at different speeds as when cornering while dividing torque nearly equally between them (48 percent front, 52 percent rear).With nearly equal torque at each axle, traction to maintain forward motion is assured under all but the most extreme conditions.
Power flow remains smooth under all conditions; not fluctuating with changes in driving surface conditions. The NV 242 transfer case also has four other ranges, which are shared with the NV 231 unit: two-wheel drive, four-wheel-drive high part-time, four-wheel-drive low part-time and neutral.
On the NV 242 unit, the center differential is locked in the four-wheel-drive high and low ranges so that both front and rear driveshafts turn at the same speed as they do with the NV 231 unit. Shifting of both transfer cases is manual with a floor-mounted lever, and both offer shift-on-the-fly capability between 2WD and 4WD high ranges.
In four-wheel-drive low range, both units provide a 2.72:1 ratio to aid in traversing steep grades and rough terrain.
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