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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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!
Turn the electronic transfer
case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge
truck is equipped with an electronic transfer case; otherwise, shift
the transfer case lever from "2H" to "4H." The electronic transfer case
is located on the instrument panel and is marked with "2WD," "4WD Lock"
and 4WD Low." The lever-equipped transfer case is located to the right
of your leg and is marked with "2H," "4H" and "4L."
Shift the transmission into
"Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph
to begin engaging in the low range 4WD. Turn the electronic transfer
case to "4WD Low," if the Dodge truck is equipped with an electronic
transfer case; otherwise, shift the transfer case lever from "2H" or
"4H" to "4L."
Tips & Warnings
Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
trucks allow you to shift from 2-wheel drive to the high range of 4WD
at up to 55 mph--consult your truck's manual to ensure that this is
possible. Do not exceed 55 mph while engaged in the high range of 4WD.
Do not exceed 25 mph while engaged in the low range of 4WD.
Do not engage in 4WD unless you are on slipper or rocky roads.
Hi, Do you have auto locking hubs on the front wheels, or manual locking hubs? 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.
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.
make sure your 4WD switch is working.and fuse is okay.because your 4WD is control by 4 electric shift motors in which drive a rotary cam which moves the mode fork and range fork inside the transfer case to select between 2WD HIGH A4WD - 4WD HIGH AND 4WD LOW RANGE.a shift motor sensing plate on the shift motor monitors the range in which the transfer case is operating a transmission range sensor monitors the gear position of the transmission.which must be in neutral to shift into low.a pair of solenoids one for 2WD one for 4WD.mounted on the upper right firewall route vacuum to the vacuum motor which engages and disengages the center axle disconnect collar in the front axle assembly.a 4 x 4 shift motor relay module contains two GEM controlled relays which shift the transfer case shift motor between 2WD and 4WD modes.a solid state clutch relay activates the A4WDclutch inside the transfer case.
Sounds like one of your hubs is sticking and not engaging. You can check them by engaging the hubs and the transfer case and jacking up each front wheel independently if it doesn't spin your good, if it does you found your problem. As far as fixing a hub goes, it may be just dry and need some grease, or there are some very good aftermarket hubs available from Warn.
Hope this helps
That depends a lot on how your truck is equipped. GM uses several different 4 wheel systems including AWD, Part-Time 4WD, Full-Time 4WD, and ON-Demand AWD. Then there is another version used on some trucks that is a combination of 4WD and On Demand AWD. - it gets a little confusing but each system as slightly different charachteristics.
Genericly speaking, if you have the push-buttons on your dash that say "4-HI", "4-LO", and "2HI" and/or Auto-4WD , the transfer case has an electronicly-controlled stepper motor which shifts the transfer case into the selected mode. An electric solenoid/actuator then engages/disengages the front differential for 2-Wheel or 4-Wheel modes. One push of the button and it shifts the transfer case and engages the front differential.
That's much easier than the old days when you had to stop the truck, get out (Sometimes in the middle of a big mud hole) and lock the front hubs then get back in and play with the lever in the floor to get the transfer case to shift into the desired mode.