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4WD Systems Transfer Cases & Locking Hubs.

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Old 02-28-2011, 03:39 PM   #1
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Default bypass 4x4 control module?

I searched though the forums and i don't think this has been asked yet.

Is there a way to bypass the 4x4 control module?
Someway to wire it so that when you flip the switch it'll switch into 4Hi or 4low?
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Old 02-28-2011, 03:54 PM   #2
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I don't think so...

Maybe if you could rig up some indicator lights to the sensor contacts that would light up when the motor is at the various positions and you had two momentary pushbuttons (each spins the motor in the opposite direction) you might be able to do it, but it'd be far easier to just swap a manual case in (or maybe put something like the Shiftster knob on it).
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Old 02-28-2011, 04:06 PM   #3
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No. The transfer case motor is a "stepper" motor. Stepper motors need a controller (the control module) to operate. It's not as simple as connecting a positive and negative wire and a switch.
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Old 02-28-2011, 04:13 PM   #4
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different voltages and resistances make this an almost impossibility, just do a manual tranny swap.
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Old 02-28-2011, 04:58 PM   #5
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Originally Posted by exbass94 View Post
No. The transfer case motor is a "stepper" motor. Stepper motors need a controller (the control module) to operate. It's not as simple as connecting a positive and negative wire and a switch.
Must be different on the '95up cases, both of mine use ordinary DC (brushed-type) motors much like the motor for your power windows. The motor is "bumped" into position by very brief clicks of the controller's relays.

A stepper motor does indeed require a controller to operate.
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Old 02-28-2011, 05:24 PM   #6
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Someone recently posted about how they had done but it requires running straight battery power to the motor and starting/stopping the motor manually with a switch by guessing when it's in the right position. Sounds like a good way to grenade a perfectly good t/case to me.......
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Old 02-28-2011, 11:32 PM   #7
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Damn, i was hoping there would be a simple solution, I guess the best way would be to find a manual T-case and switch it out.
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Old 03-01-2011, 08:08 AM   #8
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ive done it on my truck, but only tempory when the t case motor acts up. I just unplugged the motor, and spliced in 2 wires for + and - and ran them into the cab, Give them power and ground and the t case will shift, i leave the truck off and window open to hear it move. When it stops your in 4 lo, reverse the polarity and its 2 hi. Its hard to hit 4 hi cause its in the middle, it usually takes a few trys.
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Old 03-01-2011, 09:58 PM   #9
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The stock setup works fine, if it's in good shape. The problems are usually in the gearcase attached to the motor, the worm drive. There is a little bushing on the stop pin, and it breaks. When that happens, the worm drive can go too far and lock up in 2wd.
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Old 03-01-2011, 11:26 PM   #10
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My t-case is fine, its just the control module that malfunctions.
Usually ill flip the switch to go to 4hi (while in neutral and pressing the brake) and ill hear a couple of clicks, then the 4hi & 4low lights will flash on the dash board. I will then disconnect the battery and reconnect it and i will try the switch again and itll switch easily.

Is there a way to maybe cut off the sensor signals or something? I'm guessing the control module receives signals from sensors and if all are correct, itll tell the t-case to shift? Is there a way to maybe cut off the sensor and send the right signal on command with a switch or something?
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