Question about 1988 Isuzu Trooper 2 Door

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1993 Isuzu Trooper auto locking hubs not engaging

When I shift my 1993 Isuzu Trooper's transfer case into 4wd (Hi or low), the auto locking hubs do not engage. The 4wd used to work just fine, but this problem arose about a year or so ago. The trooper has about 120,000 miles on it.

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  • eric512 Dec 20, 2008

    my 93 trooper manual trans. will not engage the 4wd, the light is on saying it is engaged.

  • flykalamazoo Dec 23, 2008

    I have a 1994 with the same problem. Indicates on the dash, but not turning the front wheels. Also I have not used 4x4 setting in about 6 months. I am thawing it out in the garage right now to see if cold is the problem. How do you go about cleaning the hubs. Can you disassemble them with the front wheels still on or do they have to be removed?

  • Trooper 93 Dec 24, 2008

    I have the same problem, it started here in Calgary with the current -25 + cold snap.



    Currently it is in the garage. Can you decribe how to lubricate the hubs to fix this problem.



    Thanks - Uzi in Calgary

  • edean1025 May 11, 2010

    "It get stock usually for non usage".............Man, what an answer!



    This site sucks! They took my money, but that's it. Definitely, not what they claim to be.

  • Anonymous Mar 18, 2014

    4wd don't work

  • Anonymous Mar 19, 2014

    I have had a comp hooked up to my isuzu trooper, this is what is happening; there is a break or bad connection in the wiring between the transmission and the 4 wheel drive. The 4 wheel drive works fine, it engages and dis engages fine, but when the 4 wheel in dis-engaged and in two wheel the drive shaft is still rotating but because the 4 wheel is not engaged it rotates loosely and vibrates. What I need to know is where is the wiring harness for this? Can you send me some kind of schematic? Thank you so much for your help. =)

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Just have your auto - locking hub cleaned and use your 4wd more often, it get stock usually for non usage. dont use grease after cleaning, use oil or thick silicone oil.

Posted on Dec 05, 2008

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4x4 K1500 Chevy Truck, 4 wheel drive repair instructions


There are a number of different hub systems so this may not work but it has worked for me on both auto and manual locking hubs. On a flat surface without traffic. Put the trans into neutral, shift the transfer case into 4x4, shift the trans into reverse and back the truck up 15-20 feet. Completely stop and shift trans into drive. See if this has locked the hubs in. If not, you can also try following the same instructions except shifting into 4wd low. Sometimes the hubs need a "bump" to get them to slip into place. Keep In mind that if the 4 wd low select works, you need to shift it back into 4 wd high before continuing! When taking the truck out of 4wd to 2wd, I recommend the same, shift to neutral, select 2wd, back truck up, shift back to drive and check. Its entirely possible that your hubs need maintenance (they're often overlooked) but hopefully this will get you going. Please let me know if thus worked or if I can offer other suggestions. Good luck!

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If you have auto locking hubs chances are they are not engaging properly and will need to be removed and spline sets checked for broken teeth on locking hub and locking shaft.
If you have manual locking hubs then check that they are firm when turning to engage them in the lock position.If they are light when engaging them to the lock position then they my have broken/worn out the locking hub and spline. Also check that the engaging spring inside the hub has enough tension to engage the hubs they may be broken. If the hub are all ok then you have a problem in the transfer box, where the 4WD lever is not meshing the transfer box properly. Hope this helps, let me know how you get on.

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Check the automatic locking hub on the right side. BEWARE: You MUST have the appropriate special service tools for this job!!!!!

The vehicle will not engage in 4WD operation when the vehicle is off the ground, as the automatic locking front hubs require front wheel load to engage. When the hubs DO lock, it is normal to hear 2 to 3 soft clicks. Anything after that indicates a problem.

If memory serves, there is a cam bushing behind the plate that will wear out, and if the plate is worn out, the hub clicks and will not engage.

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