4x4 doesn't engage...Help please!
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From: Dirty Jerzey
4x4 doesn't engage...Help please!
So, I changed the shift motor on my 97 Expedition XLT and now it engages and spins the rod but the wheels don't spin (while on the lift). Seems like it's not spinning what it is supposed to on the front differential. Does anyone know if this means I need a new front differential or is there something else that could be preventing the wheels from spinning?
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From: 0,0,1
Remove the vacuum hose from it and supply the actuator with an alternate source of vacuum. You can either use a manual pump sold at most auto part stores, or you can get a long piece of vacuum hose and attach one end to engine vacuum and the other to the actuator.
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From: Dirty Jerzey
Yes... It seems like something internally is not working...
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Does anyone know where I could find a diagram for this 4x4 system? This is driving me nuts. The 4LO is engaging, although it feels like it is slipping when I try to accelerate... I was told that it is a bad differential but, could it be possible to work only in 4LOW and not 4Hi??? I'm getting desperate and may go to dealer for diagnosis...
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Fleet Owner
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From: 0,0,1
A few posts back I asked you if when on the lift if the front drive shaft is turning but the front wheels are not and you said, "yes." So since the front drive shaft is turning, it is getting powered by the transfer case. Since the wheels are not turning, the loss of power is where the front drive shaft is supposed to turn the front axle...at the front differential. Now unless you're not communicating the symptoms here correctly, your problem lies with the front differential. Hopefully it is just the vacuum actuator and not something internal.
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From: Dirty Jerzey
A few posts back I asked you if when on the lift if the front drive shaft is turning but the front wheels are not and you said, "yes." So since the front drive shaft is turning, it is getting powered by the transfer case. Since the wheels are not turning, the loss of power is where the front drive shaft is supposed to turn the front axle...at the front differential. Now unless you're not communicating the symptoms here correctly, your problem lies with the front differential. Hopefully it is just the vacuum actuator and not something internal.
Thread Starter
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New User
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From: Dirty Jerzey
A few posts back I asked you if when on the lift if the front drive shaft is turning but the front wheels are not and you said, "yes." So since the front drive shaft is turning, it is getting powered by the transfer case. Since the wheels are not turning, the loss of power is where the front drive shaft is supposed to turn the front axle...at the front differential. Now unless you're not communicating the symptoms here correctly, your problem lies with the front differential. Hopefully it is just the vacuum actuator and not something internal.
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