How to test 4x4 system without jack stands?
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Mountain Pass
Joined: Jun 2022
Posts: 162
Likes: 13
How to test 4x4 system without jack stands?
I'm not sure my 4x4 system is working.
In my Bronco, I knew how it felt to turn on 4x4, adn I don't feel that in the Ex... but the issue might be me.
The only way I can think to test the system is to put the truck on 4 jackstands.
Is there any other way I'm not seeing?
In my Bronco, I knew how it felt to turn on 4x4, adn I don't feel that in the Ex... but the issue might be me.
The only way I can think to test the system is to put the truck on 4 jackstands.
Is there any other way I'm not seeing?
Lead Driver
Joined: Aug 2022
Posts: 5,065
Likes: 1,415
From: Oologah, OK
if it is in 4x4, and on a solid surface,
a tight turn to the limit, will cause the front tires to start chuffing, grabbing, whatever you want to call it.
if it turns normal, like 2wd, then you have a problem
a tight turn to the limit, will cause the front tires to start chuffing, grabbing, whatever you want to call it.
if it turns normal, like 2wd, then you have a problem
Fleet Mechanic
Joined: Mar 2023
Posts: 1,587
Likes: 929
Put it in 4x4, jack the rear off the ground with a floor jack, see if the truck will move with just the front wheels on the ground.
Assuming you're on concrete the wheels of the floor jack will allow you to move slowly across the surface (lots of inoperable vehicles get moved around the garage with floor jacks and rolling them on the floor jack's wheels).
...
Assuming you're on concrete the wheels of the floor jack will allow you to move slowly across the surface (lots of inoperable vehicles get moved around the garage with floor jacks and rolling them on the floor jack's wheels).
...
Thread Starter
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Mountain Pass
Joined: Jun 2022
Posts: 162
Likes: 13
That's basically what I'm doing now, why I think it's not working... it was a HUGE change in my Bronco.
That sounds like a terrible idea... but it would give me the definitive answer I need.
Thanks, all.
Thanks, all.
More Turbo
Joined: May 2015
Posts: 633
Likes: 142
From: Staten Island, NY
it a lot quicker than removing the rear driveshaft!!!
Cargo Master
Joined: Nov 2017
Posts: 3,096
Likes: 534
From: Rock Hill, SC
I don't think any of those ideas tell you if "both" fronts locked.
I would think you could chock the rear wheels, lift the front, vehicle in neutral, E brake on, and rotate by hand each front wheel. If a hub does not lock, it will still free spin by hand.
I would think you could chock the rear wheels, lift the front, vehicle in neutral, E brake on, and rotate by hand each front wheel. If a hub does not lock, it will still free spin by hand.
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Cross-Country
Joined: Feb 2026
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Sounds like your front hubs aren’t locking. Here’s what you do. Flip the switch and drive it up and down your street. Park in your driveway and grab a long screwdriver and get down behind the front wheels and try to spin the front axle shafts with the screwdriver by sticking it in the u joint and turning it. If the hubs aren’t locking y ou’ll be able to spin the axle shafts. That’s very common on these due to the vacuum hub system.
Then manually lock the hub on each side and try to turn the axle shafts again. If you can’t, then your transfer case is shifting into 4wd and your vacuum hub system is malfunctioning.
Then manually lock the hub on each side and try to turn the axle shafts again. If you can’t, then your transfer case is shifting into 4wd and your vacuum hub system is malfunctioning.
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Mountain Pass
Joined: Jun 2022
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Cross-Country
Joined: Feb 2026
Posts: 51
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The axle shaft test is for when the hubs are possibly not unlocking.
Fleet Mechanic
Joined: Mar 2023
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The next easiest method would be if you have the center caps removed from the rear wheels (or have wheels that don't have center caps), just pull the rear axle shafts out. The sterling 10.5 rear end in these things is a full-float rear end, meaning the axle shaft can be removed with the vehicle on the ground without disturbing the wheel bearing. Don't even have to lay on the ground or get under the truck to remove the rear axle shafts (but it will be stinky and slightly messy as the shafts will be coated in gear oil).
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Last edited by Antonm23; Feb 25, 2026 at 09:14 AM. Reason: spelling/grammar
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