Manual 4wd Switch - Jeep Commander Forums: Jeep Commander Forum
Electronics / NAV Discussion This section contains discussion about the electronics system and NAV system in the Jeep Commander.

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post #1 of 14 (permalink) Old 02-17-2019, 11:40 PM Thread Starter
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Manual 4wd Switch

My apologies if this has already been covered-

Is there a way to manually engage the clutch packs on an NV245 transfer case, such that the TC stays in high but 4wd is engaged?
Basically a 4-HI switch.

I don't like waiting for the ESP program to figure out 4wd is needed every time I start slipping in snow.

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post #2 of 14 (permalink) Old 02-18-2019, 01:19 AM
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Your Commander is always in 4Hi. In other words it is always in 4WD and can manually be put into 4Lo with the silver t-switch on the console.

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post #3 of 14 (permalink) Old 02-18-2019, 06:20 AM
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Quote:
Originally Posted by Aerogt01 View Post
My apologies if this has already been covered-

Is there a way to manually engage the clutch packs on an NV245 transfer case, such that the TC stays in high but 4wd is engaged?
Basically a 4-HI switch.

I don't like waiting for the ESP program to figure out 4wd is needed every time I start slipping in snow.

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You are in 4-HI all the time as 5253 said.


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post #4 of 14 (permalink) Old 02-18-2019, 09:42 AM Thread Starter
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I guess I misunderstand how the TC works, then. I thought the clutches only engage if slipping is detected, but what you're saying is they are always engaged and just allow slipping based on road conditions?

I would think we'd have a lot more "Worn TC Clutch" codes if that were the case, but I very well could be wrong.

This came about because in snow driving, the truck feels like it will spin the back just a little before transferring torque to the front. I tested this on a corner and, while not scientific, it kicked the back end out like a RWD vehicle.

Thoughts?
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post #5 of 14 (permalink) Old 02-18-2019, 11:45 AM
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The NV245 acts as a rear-biased open transfer case in most situations. That's why you can get the back tires to spin a bit off the line; when you first launch the system naturally directs most power to the rear, then the clutches engage and disengage as necessary to redirect power. This is also why the clutches don't wear out too quickly; They're typically disengaged except when needed.


The system is pretty fast in its transitions between locked and unlocked, and it tries to predict slippage before it occurs to minimize it.
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post #6 of 14 (permalink) Old 02-18-2019, 10:52 PM Thread Starter
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That lines up with my experience, but I dislike this behavior in snow/ice as I mentioned.

Also makes a lot more sense, since 4LO locks the clutches (or does it bypass them?). So back to my quest for a true, locked-in 4HI.

Is there a way to manually trigger what I assume is a lockup solenoid? Mainly asking before I go digging in wiring and part diagrams.

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post #7 of 14 (permalink) Old 02-19-2019, 09:44 AM
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Looks as if people have done this, but by using a home made black box, and while converting from QT-I to QT-II. I would imagine doing something like that on a QT-II/QD-II would through lots of codes.

Here's a thread I ran across awhile ago that intrigued me, I would love to have 2 LO for pulling my travel up paved steep hills.
https://www.jeepcommander.com/forums...operation.html
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post #8 of 14 (permalink) Old 02-19-2019, 11:16 AM Thread Starter
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Thank you for finding that. Interesting read. So it definitely can be done.

All I want to do is lock up the clutches. Now 2LO... that would take some ingenuity and would most likely piss off the computers, unless you just rigged a full on bypass to the lockup solenoid. Would probably have to do ESP full off.

Ohh, I like where this is headed.

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post #9 of 14 (permalink) Old 02-19-2019, 02:12 PM
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It doesn't look like it'd be to difficult to replicate the results in the other thread; however, I don't see any way of doing that without tearing out the modules currently controlling everything. I can see it causing some major issues with other electronics, especially on QTII on QDII setups.

I also don't think 2LO is possible with our current transfer case, at least not without some serious modifications. From what I've read, the only transfer case in WK/XKs that can manage 2WD is the NV146 in the SRT Jeeps.

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post #10 of 14 (permalink) Old 02-19-2019, 02:17 PM
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Quote:
Originally Posted by consumedbywater View Post
It doesn't look like it'd be to difficult to replicate the results in the other thread; however, I don't see any way of doing that without tearing out the modules currently controlling everything. I can see it causing some major issues with other electronics, especially on QTII on QDII setups.

I also don't think 2LO is possible with our current transfer case, at least not without some serious modifications. From what I've read, the only transfer case in WK/XKs that can manage 2WD is the NV146 in the SRT Jeeps.
Sorry, 2Lo isn't quite what I ment. More like 4Lo Open as described in the referanced post.

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