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4wd High on 95-96 Explorers

NoBoundaries

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Ellicott City, Maryland
Year, Model & Trim Level
1996 XLT
I was just curious what the current progress or thoughts are on this? I know Mike Fox was looking into it. Is it possible witht the stock t-case? Can you bolt a 97+ on and have it work? Just wanted to see if there were any new answers.
 



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Hmm.

I think the last consensus was that there was some electrical tom-foolery needed to make it work. Not sure if it ever worked as planned though, the thread kinda went off on a tangent.


I also have a 96, would be nice to have the option of having just 4hi instead of 4 auto, while having the ability to switch back to 4 auto. If I had more electric knowledge I'd try tackling it myself.
 






I don't think there has been any progress. The T-case is the same, its the computer thats different, so you'd have to swap computers.
 






Thets think about this.

Ok, I've gone and done about as much reading as this site can provide on it so far, and I think it's still feasibly possible, if not as easy as the brown wire mod after all.

I believe someone already tried swapping computers, with the net effect of frying the computer. I don't think that avenue would work anyways, doesn't the computer control other year specific stuff too?

Previous writings:

Here is the original thread, there's diagrams in here, but no answers apparently.

here's the main points I've seen mentioned, someone pls correct anything wrong, im a reporter not an expert :P

1) 95-96 uses a vac disconnect front diff.

2)95-96 GEM will throw a code if it senses a change in the torque demand wire (one of the wires we'd probably need to splice into) before full 4wd engagement is complete

3) the 95-96 GEM has some kind of a wait state between the time 4wd auto is activated via the panel switch and the time the vac disconnect front diff actually engages. this allows the front diff to fully engage before the GEM switches completely to 4wd auto.

4) 95-96 4wd auto front diff torque amount is controlled by the torque on demand relay by the GEM, not the transfer case itself.

5) the 95-96 GEM uses current, not voltage to control the torgue amount applied to the front diff.

6) 95-96 4wd low has 50/50 tortque distribution full time.


Now, Assuming that the above statements are true, in order to get "4wd hi" from a 95-96 explorer We would need a relay activated circuit (*this relay could be energized via splicing power from the 4wd auto setting lead from the factory switch) that would wait for a certain length of time (however long the wait state described in 3 above), then provide the proper current to give 50/50 torque distribution. the curcuit would be tapped in at the torque on demand relay instead of the gem to do this. Doing it this way would have 3 advantages even though its a little more involved than splicing a wire (a circuit needs to be made)

a) doing it this way wouldn't "break" anything, as the proper engagement sequence would be preserved, as the custom circuit wouldnt activate until *after* the GEM has finished engagement.

b) turning off 4wd via the stock panel switch would also turn off the custom circuit, reducing the "oops forgot to shut it off" factor

c) the custom circuit could be easily made to be itself switchable, so when it's off it is transparent. and thus 4wd auto works as it did stock, also this way might allow 4wd auto/hi to be done on the fly, without throwing codes. 4wd low uses 50/50 distribution anyways, so "forgetting to switch it" is less important when switching to 4wd low.

anyways, thats what i've gathered so far. Unfortunately, I have no expertise in creating:

a circuit that waits x seconds, and after that applies x current at x voltage.

again, if im wrong on anything, correct me pls :) I think this is still feasibly doable, I wish I had the knowledge to make the circuit, I think it would work. Who wants to be the guinea pig? I have no knowledge of circuits, I'm all theory.
 






There MIGHT be a way to wire in a switch for the rear axle speed sensor. You could switch it off and make the GEM think the rear axle is always slipping. I have no idea if that would cause other problems though.
 






negatory. Disrupting a sensor causes the gem to throw a code, might also cuase the gem to not engage the front wheels at all, because of a sensor problem. this has been mentioned in past mod threads.


the reason i am suggesting what I am is for two reasons:

1) it doesnt change the stock operation of the system, as it messes with no sensors. the only thing the circuit does is provide the proper "wait time" for the 4wd to engage (as it would stock) then afterwards supplying the correct current (not voltage, from what i've read on here, this is why a circuit is needed) to the torque on demand wire to get a 50/50 torque load.

2) when the 4wd is turned off via the factory switch, the mod is also "off"

this all sounds great, but we'd need someone who knows wiring to actually see if it worked :(
 






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