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Ford Raptor Tech Forums
2013 Ford SVT Raptor Forum (Reply Only)
4HI question
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<blockquote data-quote="Nv Guy" data-source="post: 325420" data-attributes="member: 996"><p>The reason why you do not want to be in 4WD on dry pavement is because both axles are locked together in 4WD. All four wheels travel at different speeds (distances) when turning. On a slippery surface the tires can slip & that allows them to travel at different speeds (distances) without problems. On dry pavement, they can’t slip that easily so you end up putting a lot of stress on the driveline components. If you’re in 4WD on dry pavement and turn (especially sharp) you will feel all sorts of binding and feel some popping as the tires slip / skid. If you keep doing it you will probably break something.</p><p></p><p>Yes, using 4WD to pull a boat out is fine. Just drive straight ahead, get the boat out of the water. Let off the gas, shift into 2WD and away you go.</p><p> </p><p>The problem with shifting into 4WD at a high speed is that the axles have to suddenly accelerate to road speed and engage the hubs all at the same time. If it’s cold out the lube in the axles is relatively stiff, so bringing everything up to speed can be difficult. This isn’t that big a deal when it’s warm out.</p></blockquote><p></p>
[QUOTE="Nv Guy, post: 325420, member: 996"] The reason why you do not want to be in 4WD on dry pavement is because both axles are locked together in 4WD. All four wheels travel at different speeds (distances) when turning. On a slippery surface the tires can slip & that allows them to travel at different speeds (distances) without problems. On dry pavement, they can’t slip that easily so you end up putting a lot of stress on the driveline components. If you’re in 4WD on dry pavement and turn (especially sharp) you will feel all sorts of binding and feel some popping as the tires slip / skid. If you keep doing it you will probably break something. Yes, using 4WD to pull a boat out is fine. Just drive straight ahead, get the boat out of the water. Let off the gas, shift into 2WD and away you go. The problem with shifting into 4WD at a high speed is that the axles have to suddenly accelerate to road speed and engage the hubs all at the same time. If it’s cold out the lube in the axles is relatively stiff, so bringing everything up to speed can be difficult. This isn’t that big a deal when it’s warm out. [/QUOTE]
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