4WD Issues
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4WD Issues
Had the first major snowfall a week ago and kicked it into 4 wheel for the first time in awhile and noticed a few things that I do not recall happening before.
After engaging and driving it is rather noisy. Can't tell if it is grinding or what. Could it just need a lube job or could it be something worse? The hubs engage quickly yet do not like to disengage unless I drive backwards. This never use to be a problem. (I do not recall if they disengaged before without help)
When driving at medium speeds (45 ish) the truck pulls to one side or the other quickly then returns to normal.
It is not very noticable but if I slow down to 10 ish you can really feel it pull.
Does this sound like an allignment issue?
It drives rather straight when not in 4 wheel.
It has been awhile since I used the 4WD so I do not remeber these issues.
Thanks!
Jeff
After engaging and driving it is rather noisy. Can't tell if it is grinding or what. Could it just need a lube job or could it be something worse? The hubs engage quickly yet do not like to disengage unless I drive backwards. This never use to be a problem. (I do not recall if they disengaged before without help)
When driving at medium speeds (45 ish) the truck pulls to one side or the other quickly then returns to normal.
It is not very noticable but if I slow down to 10 ish you can really feel it pull.
Does this sound like an allignment issue?
It drives rather straight when not in 4 wheel.
It has been awhile since I used the 4WD so I do not remeber these issues.
Thanks!
Jeff
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Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Almost sounds like one of the hubs is intermittently disengaging.
What year is your truck? If I were to guess, I'd say it's a '98-'00 with the pulse vacuum hublocks (PVH).This kind of 4x4 system can be identified by the black plastic used on the outer part of the front hubs with a little screen in the center.
The PVH vacuum system is far from 100% reliable, which translates into engagement/disengagement issues. Another quirk is that, if the PVH system is not used often, it can get noisy.
What year is your truck? If I were to guess, I'd say it's a '98-'00 with the pulse vacuum hublocks (PVH).This kind of 4x4 system can be identified by the black plastic used on the outer part of the front hubs with a little screen in the center.
The PVH vacuum system is far from 100% reliable, which translates into engagement/disengagement issues. Another quirk is that, if the PVH system is not used often, it can get noisy.
Last edited by Rockledge; Dec 15, 2005 at 11:28 AM.
Elder User
Joined: Jun 2004
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From: Zimmerman, MN
I just noticed the same thing on my 02 Ranger. Have to backup in order for the 4WD to disengage.
If I don't back up, then it's noisy (can feel a shudder in the driveline).
very odd as it just started on mine as well. I do use my 4WD from time to time as to avoid these issues.
If I don't back up, then it's noisy (can feel a shudder in the driveline).
very odd as it just started on mine as well. I do use my 4WD from time to time as to avoid these issues.
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Sorry, i guess I forgot to put in the year of the truck. It is a 2000 4wd XLT
I never thought of it but I guess that the pulling could be caused by the hub disengaging.
Is there a way that you know of that I could test this?
Thanks!
I never thought of it but I guess that the pulling could be caused by the hub disengaging.
Is there a way that you know of that I could test this?
Thanks!
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
You could start by looking over the vacuum lines, they run from the hubs back to the PVH solenoid, and then from there to the vacuum reservoir tank. If you take the front tires off and then remove the passenger side splash shield you will have access to pretty much everything. Check the connections, look for kinks in the lines, etc. If you want to get a little more detailed in your diagnosis you can follow this:
PULSE VACUUM HUBLOCKS - Diagnosis & Testing
PULSE VACUUM HUBLOCKS - Diagnosis & Testing
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