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For Trackers (and Sidekicks) of this era (1989 to 1998) the front axle locking device is a locking hub on each front wheel. (There are no actuators until the model change in 1999.) Locking hubs come in two flavors, Manual and auto locking hubs. A look at the from wheel should tell you what you have. Manual hubs have a knob like lever with the word "lock" and "free." Auto hubs say "Auto-Locking" right on them. Both types of hubs require servicing periodicity. (Normally annually.) This means removing and disassembling. Then cleaning and light greasing before reassembling. There are some good videos on the web on how to service the manual hubs. Auto hubs are a little harder to ensure they are working properly, but some people like them. (Not me.)
Please note two things:
1. Due to differential action, BOTH hubs need to be locked for any power to be applied to the front wheels.
2. Trackers of this era are PART TIME 4x4, NOT all wheel drive. They have nothing providing for different wheel speeds front to back like a center differential. This means they should NOT be used on non-slippery surfaces like dry pavement. Beside causing handling and braking issues, it can destroy your transfercase driving on dry pavement in 4x4 due to what is called "driveline wind up".
PLEASE if you do not understand this, look it up... if you still do not understand, ask and do not use the 4x4 until you do.
My 4 wheel drive stop working on my 2001 ZR2 chevrolet Tracker. It has a
shifter on the floor and when it is put into 4 hi or 4 lo. the vehicle does not change from two wheel drive into 4. The 4x4 Dash light indicator stop coming on. What should I check?
I lost 4x4 traction when driving in icy conditions.
One of you can break down and buy a 3 dollar owners manual from a used manual vendor on ebay and make a copy for the other. Then both of you could read it and have the answers to many questions, including this one.
If you don't have a separte shifter next to the floor shifter then yours as full time four wheel drive and the hubs are the only way to turn them on and off. The other answer is it's not a four wheel drive as this shifter is in plain veiw next to the regular shifter. Not all side hicks are four wheel drive and if it doesn't have a front rear end and front driveshaft, it's not. The lock in and out hubs are used on both and the two wheel drive has dummies.
first you remove the wheel then the break caliper then remove the locking hubs just remember to lay out the parts in order a special tool is called for but this job can be done without it you have to use a small cold chisel and a hammer to tap the large nut counter clockwise to remove, you can then remove the outer bearing and the rotor and hub assembly look on the back side reomve the bearing seal and inner bearing be sure to pack your new bearings with grease before you reassemble . takes less than an hour.
I have a 1995 Geo Tracker 4WD with the same exact problem,However I did some research . You will need to go to the Kent Moore Website which makes specialty tools and look up Wheel bearing socket "J-37763" I saw the picture of it and it looks like there are 4 small rounded teeth/tabs. Unfortunately get ready to spend some money - cost is about $70.00 not including shipping/handling
I hope that this Info. helps - Jim H.