4x4 will not engage
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
Ha! Mine has done this and I couldn't figure it out. You da man! It does it intermittently also. Wonder how much that PVH retails for?
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 256
From: Woodbridge, Ontario, CA
The part number is 7C3Z-9H465-A. Price it out at your local dealer or partsguyed, whichever is cheapest for you. If you really want to test it, borrow a known good one from another truck to swap in temporarily to see if it repairs the issue. Replacement of the part is schoolgirl simple if that describes it well enough.
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
The part number is 7C3Z-9H465-A. Price it out at your local dealer or partsguyed, whichever is cheapest for you. If you really want to test it, borrow a known good one from another truck to swap in temporarily to see if it repairs the issue. Replacement of the part is schoolgirl simple if that describes it well enough.
Elder User
Joined: Sep 2007
Posts: 828
Likes: 0
From: ca
The part number is 7C3Z-9H465-A. Price it out at your local dealer or partsguyed, whichever is cheapest for you. If you really want to test it, borrow a known good one from another truck to swap in temporarily to see if it repairs the issue. Replacement of the part is schoolgirl simple if that describes it well enough.
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
Would a compromised pvh solenoid fail instantly or fail over time? I have what I believe to be a vacuum leak, just been dealing with it. The vacuum pump tested out and runs like it should. I've searched all visible lines I could find but other research I've tells me some vacuum lines run behind the dash and can fail behind the dash. When i started losing AC and all other air through dash vents it wasn't an over night thing it seemed like it took time for me to lose it, sometimes it would come through dash sometimes it would come through defrost only until finally it all started coming through defrost only. Thanks.
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
The tires and axles have to be spinning for them to engage, in other words once your stuck your stuck. I have witnessed on 2 separate occasions a 7.3 and a 6.0 get stuck in sugar sand next to my house they engaged the ESOF and tried manually locking hubs after it was stuck and it would not engage. This is why i engage mine before I pull my TT Anywhere near offroad. Unless these trucks were both broken by coincidence
Man I guess I thought wrong I thought once you manualy locked them in they would be locked
Interesting
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
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Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
I know I've seen this observation posted a lot. But I've never seen anyone post any sort of reason, description of how the hubs work, documentation, or really anything else that would describe or explain why this would happen. I also know that it's never happened with my truck and I've been stuck more than a few times.
Personally I think there is something wrong in the hubs if this is happening. The hubs are fairly simple, when you turn the dial you turn in the locking ring that engages the hub. Perhaps if the hubs are not lubricated properly, the ring won't push in easily and some vibration will help them along. If this is the case, the hubs need maintenance.
Personally I think there is something wrong in the hubs if this is happening. The hubs are fairly simple, when you turn the dial you turn in the locking ring that engages the hub. Perhaps if the hubs are not lubricated properly, the ring won't push in easily and some vibration will help them along. If this is the case, the hubs need maintenance.
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Personally I think there is something wrong in the hubs if this is happening. The hubs are fairly simple, when you turn the dial you turn in the locking ring that engages the hub. Perhaps if the hubs are not lubricated properly, the ring won't push in easily and some vibration will help them along. If this is the case, the hubs need maintenance.
What makes sense cuz by manualy turning the hub from auto position to lock position you rotated it the required amount to engauge the hub at that point
So now that this has been brought up that it has to spin so far to engauge made me start to think that its not a Hub thing by not locking into 4X4 right away but a Transfer case issue needing the revolution to Engauge.
But also once I turn the 4X4 switch in the cab from 2WD to 4WD the transfer case should Electronicaly engauge the transfer case imediatly as well
I was going to mess with it tommorro by trying to engauge 4X4 without moving the truck.
To Prove the spin theory right or wrong
IMO it should be able to Lock into 4X4 without moving
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
I did a google search on this issue after posting, and you can find a lot of other posts in other forums of similar findings. So I'm not sure if this is by design, or if it in fact does indicate an issue with the 2 trucks I have seen and I have noticed prior to replacing my PVH similar distance before my 4x4 engaged, I have not tried it since, I have been turning on the 4x4 when towing my trailer well before I pull off pavement to ensure it engages. Let us know what you find Benny. I thought the same thing when I locked the 7.3 hubs when he was stuck and it still wouldn't engage. then he called me the next day saying it worked fine the next day, only difference was this time truck wasn't stuck when he tried it.
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Well IDK whether good or bad
I went out and Manualy turned each Hub to lock position 1 hub was imediatly locked and the other hub Locked in as I spun the axel at the Ujoint it didnt spin very much though maybe 1/8 of a turn but very little. At this point I could NOT spin the front axel shaft by hand anymore and the 4X4 switch in the cab was still in 2WD and Gearshift in park maybe I needed to spin the axelshaft harder I kinda thought that I could spin the axel shaft untill I turned the switch in the cab
I was thinking that I should of been able to lock the hubs and still be able to spin the axel shaft untill I swithed the 4X4 switch in the cab and engauged the transfer case IDK Maybe I needed to spin harder
So I will have to come up with a Diffrent way to test didnt have much time today
I went out and Manualy turned each Hub to lock position 1 hub was imediatly locked and the other hub Locked in as I spun the axel at the Ujoint it didnt spin very much though maybe 1/8 of a turn but very little. At this point I could NOT spin the front axel shaft by hand anymore and the 4X4 switch in the cab was still in 2WD and Gearshift in park maybe I needed to spin the axelshaft harder I kinda thought that I could spin the axel shaft untill I turned the switch in the cab
I was thinking that I should of been able to lock the hubs and still be able to spin the axel shaft untill I swithed the 4X4 switch in the cab and engauged the transfer case IDK Maybe I needed to spin harder
So I will have to come up with a Diffrent way to test didnt have much time today
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
Well IDK whether good or bad
I went out and Manualy turned each Hub to lock position 1 hub was imediatly locked and the other hub Locked in as I spun the axel at the Ujoint it didnt spin very much though maybe 1/8 of a turn but very little. At this point I could NOT spin the front axel shaft by hand anymore and the 4X4 switch in the cab was still in 2WD and Gearshift in park maybe I needed to spin the axelshaft harder I kinda thought that I could spin the axel shaft untill I turned the switch in the cab
I was thinking that I should of been able to lock the hubs and still be able to spin the axel shaft untill I swithed the 4X4 switch in the cab and engauged the transfer case IDK Maybe I needed to spin harder
So I will have to come up with a Diffrent way to test didnt have much time today
I went out and Manualy turned each Hub to lock position 1 hub was imediatly locked and the other hub Locked in as I spun the axel at the Ujoint it didnt spin very much though maybe 1/8 of a turn but very little. At this point I could NOT spin the front axel shaft by hand anymore and the 4X4 switch in the cab was still in 2WD and Gearshift in park maybe I needed to spin the axelshaft harder I kinda thought that I could spin the axel shaft untill I turned the switch in the cab
I was thinking that I should of been able to lock the hubs and still be able to spin the axel shaft untill I swithed the 4X4 switch in the cab and engauged the transfer case IDK Maybe I needed to spin harder
So I will have to come up with a Diffrent way to test didnt have much time today
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
No, what you did provided normal results. The first hub locked in immediately. That's normal. The second hub took a small amount of axle spin. This is because the hub splines don't always line up, but a small amount of axle spin allows the splines to match and it locked. With both hubs locked, the front drive axles and drive shaft turn with the front wheels. Which means that if the front wheels can't turn, the axles and drive shaft don't turn. The front axles aren't connected to the main drive line, because the truck is in 2WD. But the axles are connected to the wheels.
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
No, what you did provided normal results. The first hub locked in immediately. That's normal. The second hub took a small amount of axle spin. This is because the hub splines don't always line up, but a small amount of axle spin allows the splines to match and it locked. With both hubs locked, the front drive axles and drive shaft turn with the front wheels. Which means that if the front wheels can't turn, the axles and drive shaft don't turn. The front axles aren't connected to the main drive line, because the truck is in 2WD. But the axles are connected to the wheels.
Oh yes your right didnt think of it like that but your ABSOLUTLY RIGHT
Duh My Bad
I was thinking I need to get the Front wheels up off the ground Then try the same thing now that you pointed out my problem with the test Im positive I need to get the front tires up off the ground
Thanks Dave