This is deep. I'm curious to the answers.opCorn:

 

Hey Cricket, it's leading me to believe I can possibly come up with a transfercase control and possibly a gear ratio change device. That is unless the HyperTech works for that?

 

Hey Cricket, it's leading me to believe I can possibly come up with a transfercase control and possibly a gear ratio change device. That is unless the HyperTech works for that?

I don't know if this has anything to do with your last response. But when I met up with Mr. Boh the other day he said a jeep tech(..possibly on this site...) had installed a 4x4 on/off switch in a wk before...meaning it was 2wheel drive when he wanted it to be. That's what I thought about when you said xcase control. PM Mr.Boh he said he has been watching your thread so he should be willing to help. He was full of knowledge when I talked to him.

Sent from my thumbs.

 

Here's the link. His screen name is Blown7 and he can program your Jeep to do just about anything. Switch is $1000 plus the expense of getting your Jeep to him. Look at post #122.
http://www.jeepforum.com/forum/f67/crd-regear-3-73-3-21-completed-1127766/index9.html

 

Dan, did he install it on a SRT WK? A lot of guys have put the 2wd switch on the SRT's and I'll be dang if they can't lay some rubber.

 

Dan, did he install it on a SRT WK? A lot of guys have put the 2wd switch on the SRT's and I'll be dang if they can't lay some rubber.

Honestly I'm not sure. I bet those things are quick.

Sent from my thumbs.

 

Out of the Service Manual, I think it answers the question about LO:

The NV245 transfer case provides Full-Time Active Four-Wheel Drive for optimum traction in a wide range of conditions and is used in Quadra-TracT II and Quadra-DriveT II systems. The transfer case center differential distributes torque 48 percent to the front axle and 52 percent to the rear axle along with an electronically controlled clutch pack that is coupled to the center differential for torque biasing. The NV245 electronics provide an active system because it can anticipate and prevent slip. The transfer case can redistribute 100 percent of torque to the front or rear axle, depending on need. For added traction when traversing steep grades, rough terrain or extremely slippery/poor traction surfaces at low speeds, the transfer case can be switched into 4WD Low, which multiplies engine torque 2.72 times and locks the clutch pack for maximum traction at all times. The Neutral mode allows the vehicle to be flat towed behind another vehicle.
Electric shifting is accomplished with a T-handle transfer case lever in the shifter assembly to provide simplified
operation and positive engagement of 4 Low. A pushpin button is provided to shifting the transfer case into Neutral

 

Do you think it locks for 4HI when wheel slippage is detected? Do the wheel speed sensors work with the inout and output on the transmission to have the transfer case motor go from "open" to "lock" when in 4HI?

Just thinking out loud.

 

Do you think it locks for 4HI when wheel slippage is detected?

I think it does lock but only monetarily in 4HI, as it sees wheel slippage from front to rear axle.

Do the wheel speed sensors work with the inout and output on the transmission to have the transfer case motor go from "open" to "lock" when in 4HI?

Yes, I'm sure they do. If it senses wheel slippage one one axle left or right, it applies braking to the spinning wheel. If it senses wheel slippage front to rear, it applies transfercase clutch pressure to the point of locking if needed.

In the manual the wheel sensors are wired directly into the ABS Brake Module, but I'm sure the Jeep monitors these sensors, the engine speed and transmission speed to determine what to apply.

 

Would putting in a 2wd switch help with anything in regards to mileage? I'd be interested in doing it if you could see some sort of gains from it.

 

Would putting in a 2wd switch help with anything in regards to mileage? I'd be interested in doing it if you could see some sort of gains from it.

It would help cause the engine isn't actually putting power to the front wheels. Mr. Boh said when he talked to the guy it would be around 2ish grand..

Sent from my thumbs.

 

That's a bit pricey for a switch, must be more to it than just a switch.

 

That's a bit pricey for a switch, must be more to it than just a switch.

Well of course. I think he has to breakdown the xcase and switch or add or subtract gears..my guess is labor intensive and parts expensive..

Sent from my thumbs.

 

So not really worth it. Check. Thanks for the info though.

 

The insides of a Transfercase Motor/Sensor:

At the top, 12Vdc Brush Reversing Motor
At the bottom of the motor armature is the 12Vdc Locking Solenoid w/ clutch plates
Next is 3 sets of planetary gears,
And under the gearing is a 3 wire rotary position sensor.

Controllable outside of the FDCM? I think so. Possibly another route to add a QT2 tcase to any QT1.
Would anyone be interested in a black box to do this?

 

I'm getting ready to install my NV245 transfercase into my XK. I have bench tested my program and controller for the last few weeks with excellent results. Very consistent results shifting the transfercase between all positions. Confidence is high that it will work. Only concern I have is throwing a Gear Ratio error code in Low or Low Loc position, which I will find out shortly, and I believe I have a fix for that if it occurs.
I am using the stock "T-Handle" transfercase switch, which will look stock. I Also have a power on "Key" to power on the controller and modules. My intent is for this controller to be completely off, with no power to it when driving "On Road". Off Road, you would power up and it would provide full manual control of the transfercase. Why not a simple linkage to shift, because this transfercase uses clutch packs to lock in high and low and requires the torque of the motor to apply pressure and hold it there with a brake.
Below is the way I see it operating, rough draft:

Transfercase Mode Selection.

Off Road Operation Only.

The procedure to shift (Select Mode Position) is as follows:

1. First turn on the power to the controller with the Keyed Power Switch by rotating it clockwise.

2. Press down on the vehicle's brake pedal.

3. Shift the transmission into Neutral or Park.

4. Using a pen or other pointed tool, depress the Mode "Pen" Switch fully down and release. (This places the controller in the select mode) The "N" Indicator Light will light up solid to confirm the controller is in the select mode.

5. Next raise the Mode Select T-Handle up fully and down the number of times required for the Mode you desire to use.

• High Loc = 1 Count
• High = 2 Counts
• Neutral = 3 Counts
• Low = 4 Counts
• Low Loc = 5 Counts

6. After you have made your selection, depress the Mode "Pen" Switch fully down and release. This locks in your Mode Position Selection and powers the transfercase motor, which shifts the transfercase to your selected position.

7. Once the transfercase has been shifted, the "N" Indicator Light will flash the transfercase Mode Position.
"N" Indicator Light will flashes the following codes.

• High Loc = Light on, then off for 2 seconds
• High = Light on, Light off for a count of 2, then off for 2 seconds
• Neutral = Light on, Light off for a count of 3, then off for 2 seconds
• Low = Light on, Light off for a count of 4, then off for 2 seconds
• Low Loc = Light on, Light off for a count of 5, then off for 2 seconds

​

If you see a continuous rapidly flashing light, there is an error in the shifting of the transfercase. Please refer to the Error Code Section.

8. After the transfercase has completed the shift to your Mode Selection and you have confirmed the "N" Indicator Light has flashed the correct code, you may turn off the power to the controller with the Keyed Power Switch.

9. Shift your transmission back out of Neutral or Park .

Transfercase T-Switch Special Features

Off Road operation only.

With this controller for off road only, there is an option of leaving the power on while off road.
If you choose to leave the power on during off road use there are two additional features available.

These options are:

• High to High Loc toggle shifting (on the fly)
• Low to Low Loc toggle shifting (on the fly)

​

On these two options, it is not required to apply the brakes, place the transmission in Neutral or Park, nor depress the Mode "Pen" Switch to shift Mode Positions. This can be done, because the transfercase does not need to go across the neutral position of the transfercase to get to the other mode position.

1. The procedure is to raise the Mode Select T-Handle up fully and hold it up for 2 seconds, than lower it back down. If you were in High, the transfercase will be shifted to High Loc and vice versa. If you were in in Low Loc, the transfercase will be shifted to Low and vice versa.

2. After using the Mode Select T-Handle, always verify transfercase position by confirming the "N" Light is flashing correctly for the Mode Position selected.

This feature is very effective for negotiating tight trails. Example: Using Low to allow for easier turning and less wear on the drivetrain in easier and/or tighter turning areas, then when encountering a section requiring maximum traction, the Mode Select T-Handle can be used to toggle the transfercase into Low Loc. Once the section is completed, simply toggle the transfercase back to Low. Same example but only using High and High Loc as required.

Error Code Section

If the transfercase shift motor is unable to complete the selected Mode Position, the "N" Indicator Light will rapidly continuously. The main reason for this error to appear is when crossing over neutral the transfercase gears are not aligned properly to allow for complete engagement. What this means is the transfercase is stuck between positions.

The procedure to correct this error is:
1. Turn the power off to the controller with the Keyed Power Switch. Wait 5 seconds and turn the power back on, this will reset the controller error code.

2. Next use the Mode Select procedure to shift the transfercase back to the original Mode position.

3. Shift the vehicle into drive or reverse and move the vehicle slightly to re-phase the transfercase gears.

4. Then follow the Mode Select procedure to shift to the Mode Position you were selecting.

If this does not correct the problem after a few tries, then the other possible causes for this error are, no power to the transfercase motor brake or motor and/or a bad transfercase motor. See Troubleshooting electrical parts.

Why the power key, brake, neutral and Mode "Pen" Switch? It's to insure there is no unintended use or shift of the transfercase, unless you are completely aware of what you intend to do. Safety First.

 

Im happy with how my jeep works off road. I just think 2wd would be nice to have.

 

It's intended for 3.7L V6 QT1 owners like me. I'm sure you are happy with QT2. If you want 2wd, there was a post about that earlier in this thread.
Have you tried turning off your traction control? I've been working with this QT2 transfercase and have not found a "2wd" position at all.

 

I mounted the controller under the dash just left of the steering column last night. Here is a picture. No wiring to it yet.

 

To mount the Transfercase Select Switch, a couple holes need to be drilled on the bottom of the Shifter storage area. And a hole provide for the Switch Plug to plug into the rear of the Switch.
I think I can make a template for these holes.

 

Here is the Transfercase Selector Switch mounted and plugged into the stock wiring harness. My XK had this wiring in place. But it needs to be modified to work with my controller.

 

Here is the modified wiring, Pins 1, 2 & 3 cut and wired to run to my controller. Please note I have soldered and heat-shrink-ed all connections and sealed of cut ends of wiring harness that will not be used. I have run these wires along the stock wiring harness using tie-wraps. All changes under the console are complete.
Next will be making up the panel to mount the two modules and relays that will power and control the Transfercase Motor, that will be going in under the passenger side rear seat.
After that running the wires between the two areas, adding the key switch and testing the Transfercase before actually installing it. One step at a time.

 

This is great!

 

I really like the idea of using the stock transfercase selector switch, but I could possibly set up a couple aftermarket switches to do the same. If people are interested.
It may be a bit less expensive, with two switches, but more wiring required.
The Transfer-case Selector Switch #56050139AF costs $40.39 online.

 

Another step closer. Under the rear seats of the Commander there are to small areas covered by a carpeted lid. On the driver side is were the FDCM and Parking Control Module would go. On the passenger side, mine is empty and it provides a perfect place to mount the relays and voltage regulators. Next step is to ground the panel, provide power and final connecting of the wires to the controller under the dash.

 

If you all remember way back, I was lulled into the idea a Jeep dealer or Jeep itself could upgrade my QT1 to QT2. I was collecting all the parts to do so. even to the point of swapping out the mid underframe wiring harness.
Of course the Jeep Dealer or Jeep didn't happen. And that why I'm here.
Moving forward. with that new wiring harness there are connections under my rear seat for the FDCM and under the Jeep the connection for the Transfercase Motor. Yes you guessed it, I spliced into the wiring harness under my rear seat. This gives me all connections inside the jeep.
However, if someone else were to do this, there is a large grommet under that same area under the rear seat, wires can be brought up through that grommet and sealed. You could find a junk yard WK or XK with QT2 or QD2 and get the Transfercase motor connection from one of them. Or worst case buy a repair splice-in connector from Jeep. Part Number #68040504AA

 

Had a quick read over this, will have to do a more in depth one!

Im looking at trying to lock the T-case in high range, mainly so if a cv or driveshaft is gone it can still drive (i have the QDII) Is it possible to do just this easily?

Dave

 

That's a good question. With a few relays and a voltage regulator I know it's possible to drive the transfercase motor to stall out in the direction of Hi "Loc", shut off power to the motor and to the motor (clutch/brake). But also keep in mind it is not a full lock up. It's applying pressure against clutch plates.
Here is the real question. If you bypass the Final Drive Control and force Hi Loc, once you start running what does the FDCM do with it. Does it return it back to hi because no slippage is detected at the wheels?
Will it cause errors and put you in some type of "Limp Mode" Not sure?
Keep in mind, my XK has QT1, so there is no FDCM and the Jeep really doesn't know I've put in a QT2 transfercase, unless I'm in Low. Which I am not sure if it will throw error codes, gear ratio, etc. I do think after reading the service manual, that when in Low I can keep it in 1st gear and at speeds below 25mph and it won't, but we'll see. I'm hoping to be able to install this weekend.

 

I have the transfercase in my Jeep!

Well, technically it's in the Jeep, in the back cargo area
But it's all hooked up electrically and functioning just like it did when I was bench testing.
So that means the electronics wired into the Jeep work!

 

I have the transfercase in my Jeep!

Well, technically it's in the Jeep, in the back cargo area
But it's all hooked up electrically and and functioning just like it did when I was bench testing.
So that means the electronics wired into the Jeep work!

That's awesome dude I can't wait to see it working