four wheel drive sharp corner steering problem?
My truck is a part time four wheel drive ford f250, why is it that when I have it in four wheel drive and take a sharp turn on pavement, the steering gets really giddy and has a pumping motion to it? It doesn’t do this when in 2wd, I’ve heard this is normal but I don’t understand why.
So basicly if the truck had a better differential it wouldn't do that, correct?
Don't worry, this is normal. When your truck is in 4wd, all four tires are trying to rotate at the same speed (rpm) as each other. On a sharp turn, lets say to the right, the tires on the inside of the turn (the right side of your truck) actually travel a shorter linear distance than the tires on the outside of the turn (left side of your truck), but they are all turning at the same rpm. That "giddy/pumping" motion is the tires on one side rotating but not moving forward (rotating in place). While it may feel like your truck is breaking, this is a good way to ensure that your 4wd is working properly. Did that answer your question? I can try to explain another way if this didn't make sense.
As to your additional information:
Not necessarely, there's nothing wrong or less effective with your differentials (front and rear). I believe that if you had slip differentials you wouldn't have true four wheel drive. I'm partial to the setup you've got.
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Don't worry, this is normal. When your truck is in 4wd, all four tires are trying to rotate at the same speed (rpm) as each other. On a sharp turn, lets say to the right, the tires on the inside of the turn (the right side of your truck) actually travel a shorter linear distance than the tires on the outside of the turn (left side of your truck), but they are all turning at the same rpm. That "giddy/pumping" motion is the tires on one side rotating but not moving forward (rotating in place). While it may feel like your truck is breaking, this is a good way to ensure that your 4wd is working properly. Did that answer your question? I can try to explain another way if this didn't make sense.
As to your additional information:
Not necessarely, there's nothing wrong or less effective with your differentials (front and rear). I believe that if you had slip differentials you wouldn't have true four wheel drive. I'm partial to the setup you've got.
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postal 30 is 100% correct.
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