2Low (2WD Low Range) Multimode T-Case

Robb235

Robb235

Senior Member
1999 Limited with the j-shift shift pattern transfer case with a push button on the shifter for 4Hi unlocked.

Trying to figure out how to put the transfer case into Low, but also stay in 2wd, aka 2-Low. Trying to backup my 4,000lbs boat + trailer up my steep driveway is such a pain in 2Hi. 4Low is great when I’m backing up straight, but due to where I’m parking the boat, it involves a lot of turning the wheel, which binds things up in 4Low.

I’ve searched across this forum, and several others, and it gets confusing with all the variations of t-case options through the years. Some threads say disconnecting a blue plug on the driver side t-case achieves 2Low, while others say it’s a blue plug on the passenger side. I’ve tried disconnecting both, and neither gave me 2Low when I put the t-case into low range.

I’m assuming then that I must need to interrupt one of the wires in the 4wd ECU behind the glove box, but which one? Any help would be appreciated.

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Robb235 said:
1999 Limited with the j-shift shift pattern transfer case with a push button on the shifter for 4Hi unlocked.

Trying to figure out how to put the transfer case into Low, but also stay in 2wd, aka 2-Low. Trying to backup my 4,000lbs boat + trailer up my steep driveway is such a pain in 2Hi. 4Low is great when I’m backing up straight, but due to where I’m parking the boat, it involves a lot of turning the wheel, which binds things up in 4Low.

I’ve searched across this forum, and several others, and it gets confusing with all the variations of t-case options through the years. Some threads say disconnecting a blue plug on the driver side t-case achieves 2Low, while others say it’s a blue plug on the passenger side. I’ve tried disconnecting both, and neither gave me 2Low when I put the t-case into low range.

I’m assuming then that I must need to interrupt one of the wires in the 4wd ECU behind the glove box, but which one? Any help would be appreciated.

27cd17bf85b0cf9d87b8d60e994e5497.jpg





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Click to expand...

I could be totally wrong here but I don’t think you can achieve 2lo without double/triple shifters unless you do some crazy custom one off setup. Northwestfab’s install instructions of their dual case setup has a guide on how to get a standard j shift tcase into 2lo (should be similar to a multi mode tcase but not 100% sure). Remove tcase, split the case open, remove shift rails, this little metal pill shaped thing pops out that prevents the shifters from shifting into 2lo, grind a tiny nib off one of the shift rails, put it all back together.

Edit: welp here’s the first one that came up on a quick google
Twin-stick - Front Range Off-Road Fabrication
 
T4topher said:
I could be totally wrong here but I don’t think you can achieve 2lo without double/triple shifters unless you do some crazy custom one off setup. Northwestfab’s install instructions of their dual case setup has a guide on how to get a standard j shift tcase into 2lo (should be similar to a multi mode tcase but not 100% sure). Remove tcase, split the case open, remove shift rails, this little metal pill shaped thing pops out that prevents the shifters from shifting into 2lo, grind a tiny nib off one of the shift rails, put it all back together.

Edit: welp here’s the first one that came up on a quick google
Twin-stick - Front Range Off-Road Fabrication
Click to expand...



I’m pretty sure you can modify the electronics somehow to achieve 2Low. Sort of how like the grey wire mod allows for locking the rear differential in other than just 4Low. It fools the 4wd ECU into doing what you want it to do. But due to all the different variations of t-cases that came in the 3rd gen throughout the years, I think the methods to acquire 2Low are all different (I think).

For example, I tried this method, but it didn’t work for me:
Low Range Two Wheel Drive Mod - Toyota 4Runner Forum - Largest 4Runner Forum


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Robb235 said:
I’m pretty sure you can modify the electronics somehow to achieve 2Low. Sort of how like the grey wire mod allows for locking the rear differential in other than just 4Low. It fools the 4wd ECU into doing what you want it to do. But due to all the different variations of t-cases that came in the 3rd gen throughout the years, I think the methods to acquire 2Low are all different (I think).

For example, I tried this method, but it didn’t work for me:
Low Range Two Wheel Drive Mod - Toyota 4Runner Forum - Largest 4Runner Forum


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Ahh you’re basically trying to make it so when you shift into 4wd on the tcase the front diff ADD doesn’t actuate. You 100% verified you were in 4wd with the front tires spinning? Your front drive shaft will still spin but your front cvs shouldn’t if you put your truck on jackstands.
 
I might be wrong but couldn't you achieve this by using manual hubs and leaving them unlocked in 4 low? Another win for manual hubs.

I think you could intentionally unplug the vacuum tube responsible for engaging the autolocking hubs on the front and while the front drive shaft would still spin, it would be disengaged from the front wheels so no binding. I could be very wrong, but intentionally sabotaging should be relatively easy way of getting 2 low.

I had this happen on my J-shifter and it behaved like a 2wd in 4wd even with a functioning TC. But I never tried low range, but given it is relying on mechanical linkages I would of had 2 low.
 
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^that would work or intercept the signal to that vacuum switch with a rocker switch, perhaps at a more convenient location like the 4WD ECU to a dash rocker switch, the 99 is complex so you would still have a flashing 4wd indicator telling you something isn't right until all systems agree with inputs.
 
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T4topher said:
Ahh you’re basically trying to make it so when you shift into 4wd on the tcase the front diff ADD doesn’t actuate. You 100% verified you were in 4wd with the front tires spinning? Your front drive shaft will still spin but your front cvs shouldn’t if you put your truck on jackstands.
Click to expand...



The first clue I was in 4wd was the 4wd indicator lights lit up with no blinking error. The second clue was the bucking and binding I was getting with the wheels turned on my driveway. Was definitely in 4wd when t-case selector was in 4Low lol.


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I’m not sure if this is applicable but when I did the blue/gray wire mod to be able to use the rear locker on the fly, I originally grounded the wrong wire and my 4runner acted like it was in 4Lo. It held in gear super long, seemed extra torquey and it wouldn’t shift into overdrive. I believe if you ground the blue wire coming from the “harness side” it will trick the ecu into thinking you are in 4Lo, you could put this on a grounded switch and have it on the fly in theory. Look up some of the threads on this and you should see what I’m talking about.


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Robb235 said:
1999 Limited with the j-shift shift pattern transfer case with a push button on the shifter for 4Hi unlocked.

Trying to figure out how to put the transfer case into Low, but also stay in 2wd, aka 2-Low. Trying to backup my 4,000lbs boat + trailer up my steep driveway is such a pain in 2Hi. 4Low is great when I’m backing up straight, but due to where I’m parking the boat, it involves a lot of turning the wheel, which binds things up in 4Low.

I’ve searched across this forum, and several others, and it gets confusing with all the variations of t-case options through the years. Some threads say disconnecting a blue plug on the driver side t-case achieves 2Low, while others say it’s a blue plug on the passenger side. I’ve tried disconnecting both, and neither gave me 2Low when I put the t-case into low range.

I’m assuming then that I must need to interrupt one of the wires in the 4wd ECU behind the glove box, but which one? Any help would be appreciated.

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Low Range Two Wheel Drive Mod
 
It is very easy to do this with the J-shift case...

With the Multimode case (and 4WD computer) it will be unhappy.

To check if it will work, unplug the two ADD VSVs while still in 2WD, then shift into 4LO. You should have some flashing lights, but 2LO... If you are already in 4WD and unplug the VSVs, you'll probably stay in 4WD.

If that works, then we can figure out the switch setup.

-Charlie
 
phattyduck said:
It is very easy to do this with the J-shift case...

With the Multimode case (and 4WD computer) it will be unhappy.

To check if it will work, unplug the two ADD VSVs while still in 2WD, then shift into 4LO. You should have some flashing lights, but 2LO... If you are already in 4WD and unplug the VSVs, you'll probably stay in 4WD.

If that works, then we can figure out the switch setup.

-Charlie
Click to expand...

After studying the wiring diagram for a while, I'm thinking what you suggested might work, granted I do believe it will piss off the 4wd computer like you mentioned.

The other thing I'm thinking is while in H2, simply pulling the 20A 4WD fuse. That should kill the 4wd computer completely, and then I think I should be able to put the t-case into 4Low, but with the 4wd ECU being dead, it won't be able to send any signals to the VSV, so I should stay in 2wd and still have the low range gear reduction that I'm looking for. And with 4wd ECU being dead, shouldn't get any blinking 4wd error lights either. Will try tonight when I get home.
 
And it worked. So with it in 2wd, pull the 20A fuse in the cabin for the 4wd. Then shift t-case lever to 4Low, and just like that you’re in 2Low and no blinking lights on the 4wd indicator.


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I’ve used 2Low twice now to back my boat up my driveway and snake it around the side of my house, and it’s a game changer. Really makes the whole process so much easier having the t-case in low range, but not having it in 4wd.


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Robb235 said:
I’ve used 2Low twice now to back my boat up my driveway and snake it around the side of my house, and it’s a game changer. Really makes the whole process so much easier having the t-case in low range, but not having it in 4wd.


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Click to expand...

Sounds like it's time to put that fuse on a toggle switch.
 
Good mod! Note that this will only work if you have an open or selectable diff in the front. Otherwise you’ll be running 3WD.

Having manual hubs I agree that 2LO is very handy. Especially with a manual! I use it in driveways and drivethrus often
 
JZiggy said:
Good mod! Note that this will only work if you have an open or selectable diff in the front. Otherwise you’ll be running 3WD.

Having manual hubs I agree that 2LO is very handy. Especially with a manual! I use it in driveways and drivethrus often
Click to expand...

It's not 3wd if you have ADD. With ADD disconnected it will just spin the carrier and the disconnected shaft. And not transfer power to the driver tire.
 
Rushthezeppelin said:
It's not 3wd if you have ADD. With ADD disconnected it will just spin the carrier and the disconnected shaft. And not transfer power to the driver tire.
Click to expand...

You and JZiggy just said the same thing in different ways. JZiggy's point was that this method doesn't work if you have a traction device in the front diff. I almost said the same thing as you, but reread what he said before posting.
 
Been using 2Low for another season of backing my boat up my driveway in reverse. Really makes the process so much easier. No more having to slowly give it more and more gas in 2Hi until it lurches back. Can now make much more precise adjustments as I maneuver the boat back into its spot around the side of my house.
 
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