4x4 Switch Question
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Joined: Jun 2017
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From: Arizona
4x4 Switch Question
When I switch from 4x4 high to 4x4 low I hear a noticeable clunk but when switching from 2 wheel to 4 wheel I don't hear anything happening. The 4x4 light comes on but no clunk, click or other evidence that anything is happening.
Should I hear something when going from 2WD to 4WD and back again?
Should I hear something when going from 2WD to 4WD and back again?
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Joined: May 2014
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From: Lake Hartwell, GA
Not necessarily as long as the 4x4 is working properly. Sometimes my truck will clunk a bit going into 4x4, other times it is smooth as glass. As long as it does not seem like it is binding or something wrong, then you are OK.
Going from 4 high to 4 low I usually do get a bit of a clunk. I would say 75% of the time.
Going from 4 high to 4 low I usually do get a bit of a clunk. I would say 75% of the time.
Cargo Master
Joined: Oct 2007
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From: BoCoMo
When I switch from 4x4 high to 4x4 low I hear a noticeable clunk but when switching from 2 wheel to 4 wheel I don't hear anything happening. The 4x4 light comes on but no clunk, click or other evidence that anything is happening.
Should I hear something when going from 2WD to 4WD and back again?
Should I hear something when going from 2WD to 4WD and back again?
That noise is the differential changing from high to low. It does make 'a noise' going the other way, but not as loud. It is normal and nothing to worry about.
One thing to think about is that engaging the switch, may not engage your hubs if you have a vacuum leak or bad seals. you may have to get out of the truck and manually engage the hubs.
Logistics Pro
Joined: Nov 2006
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From: Fallon,NV & Bainbridge OH
As Sous said going into gear is usually noise free because everything is in neutral/ not loaded state but when you go to shift out there usually loads on the gears and system. Theses are caused by any of several things, some as simple a slight difference in tire size due to wear which causes things to rotate at different speeds. That is why all manufactures suggest frequent tire rotations and replacing ALL tires at the same time on all wheel drive (AWD) and 4wd vehicles to prevent problems.
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From: Arizona
Thanks for the replies.
My hubs were converted to manual before I got the truck. I see vacuum lines hanging nearby but I'm not sure if that is a good thing or bad?
Took the truck Elk hunting and used the 4x4 when off road. It seemed to be working but I couldn't be sure so I stopped, put it in neutral and switched to 4x4 low range. The truck definitely revved higher to go slower and when I stopped and switched back I could hear the faint clunk. This got me wondering if I should be hearing that same noise when switching from 2wd to 4wd.
Appreciate the quick responses and helpful information. This is a great site for us newbie diesel owners.
My hubs were converted to manual before I got the truck. I see vacuum lines hanging nearby but I'm not sure if that is a good thing or bad?
Took the truck Elk hunting and used the 4x4 when off road. It seemed to be working but I couldn't be sure so I stopped, put it in neutral and switched to 4x4 low range. The truck definitely revved higher to go slower and when I stopped and switched back I could hear the faint clunk. This got me wondering if I should be hearing that same noise when switching from 2wd to 4wd.
Appreciate the quick responses and helpful information. This is a great site for us newbie diesel owners.
Cargo Master
Joined: Oct 2007
Posts: 2,712
Likes: 107
From: BoCoMo
Thanks for the replies.
My hubs were converted to manual before I got the truck. I see vacuum lines hanging nearby but I'm not sure if that is a good thing or bad?
Took the truck Elk hunting and used the 4x4 when off road. It seemed to be working but I couldn't be sure so I stopped, put it in neutral and switched to 4x4 low range. The truck definitely revved higher to go slower and when I stopped and switched back I could hear the faint clunk. This got me wondering if I should be hearing that same noise when switching from 2wd to 4wd.
Appreciate the quick responses and helpful information. This is a great site for us newbie diesel owners.
My hubs were converted to manual before I got the truck. I see vacuum lines hanging nearby but I'm not sure if that is a good thing or bad?
Took the truck Elk hunting and used the 4x4 when off road. It seemed to be working but I couldn't be sure so I stopped, put it in neutral and switched to 4x4 low range. The truck definitely revved higher to go slower and when I stopped and switched back I could hear the faint clunk. This got me wondering if I should be hearing that same noise when switching from 2wd to 4wd.
Appreciate the quick responses and helpful information. This is a great site for us newbie diesel owners.
the clunk noise is the shifting into the 4-wheel drive differential. This is not the hubs. You will know that you are in 4-wheel drive for when you turn the front wheels and move forward and feel a little 'crab walk'.
Logistics Pro
Joined: Nov 2006
Posts: 3,674
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From: Fallon,NV & Bainbridge OH
If you have open vacuum lines you need to cap them as your truck uses the vacuum to operate the heater/ac box doors.
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