How does one go about over riding the low range limiter on these trucks?

I second that! This sucks! Trying to pull out a small tree stump in low range - feeding more and more throttle and letting the clutch out more and more and the truck would barely move. This is one area I am really dissapopointed. My old '94 6.5 TD would turn all 6 tires at a dead idle if strapped to an immovable object. In fact, I dug holes in the blacktop with that truck. I could have gotten out of the truck, and there it would sit, at an idle, turning all six tires. I'm sure the Dmax would stall.

I fixed mine with efi live , but there has to be another way!!

I havent spent more than 100 yards in 4LO....what is this limiter thing?

I fixed mine with efi live , but there has to be another way!!

Is there an ON/OFF in EFI Live for drivetrain protection? How exactly did you disable this in EFI Live?

Thanks.

is yours the electronic button transfercase or the manulal lever?
i have the manulal shift and never noteced any kind of limiter the cuple times i have used it 4low

You can't get the electronic transfer case with a ZF (thankfully ;) )
I was pulling trees out on the 4th with my truck..I didn't notice any limiter either..:confused:

The suspense is killing me. How do you fix the Defuel without EFI Live? I am guessing a little rewiring of the sensor? I would really like to know as I am planning on doing my first pull Saturday. I can not afford EFI Live till next week. :( I spent all my money on the traction bars, pulling hitch, and lift pump filter setup.
:help:

maby some how mess with the sensors in the t case to fool the computer that it is still in 2hi when its realy in 4 low. i dont know im jsut throwing a idea out there

Evan (crankitupdiesel) told me you put it in 4 HI so the truck knows its in FWD and then get under it and unhook the connector off the T-case and then put it in 4 LOW. That way the computer thinks its still in 4 HI but really your in 4 LOW. I beleive thats how he told me to do it. He knows though if you ask him or if he writes on here. Good luck just be careful thats a lot of power and deep reduction!!

Is there an ON/OFF in EFI Live for drivetrain protection? How exactly did you disable this in EFI Live?

Thanks.


Im not 100% this is the right thing but my truck dose not seem to defuel but this is what i changed

CLick on system, and then torque limiting, and parameters, there are limits on 6different things there!!

Put your truck in 4 HI, then get under the front and un-plug the front axle accuator, then go to the t-case and un-plug the one on the top,(two wire plug) then get back in and put it in 4-LO. Now the truck THINKS it's in 4-HI and won't limit it. Thats what Evan told me to do when he put my clutch in.
Hope this helps.

Put your truck in 4 HI, then get under the front and un-plug the front axle accuator, then go to the t-case and un-plug the one on the top,(two wire plug) then get back in and put it in 4-LO. Now the truck THINKS it's in 4-HI and won't limit it. Thats what Evan told me to do when he put my clutch in.
Hope this helps.


Yep The Cat is out of the bag.... That is how it is done....:cool:

I did it differently (not saying it's right, just how I did it). On the transfer case there is a 3 wire connector (black, white, blue). I did some testing, the black appears to be a ground. A connection is made inside the tcase between the black and the blue wires when the shifter is in 4H... The blue wire I think goes to the actuator or to the actuator via some other route... a connection is made between the black wire and the blue and white wire when the shifter is in 4L.... I think the white wire goes to the ecm or something to tell it that the tcase in low range.... since it is not a hot wire, (and I'm not saying this is the right way to do this), I simply cut the white wire which doesn't allow the signal to get from the tcase to the ecm or wherever.... I tested it and everything works as it normally would except now it didn't appear to defuel, so I plan to attach a switch to the white wire, so I will be able to ground it at any time to basically "trick" the truck into thinking it is in 4low and defuel (instant valet mode).... Like I said, I'm not saying this is the right way and I'm not encouraging everyone to just go cutting wires on their trucks. I just thought I would share what I did..also, Sorry for the long post

Later, TW

As others asked what is the low range limiter, is it a speed limiter, a rev limiter, or a power limiter? I havent used 4LO much at all but didnt know it was limited. Whats the reason for this limiter?

:cool2:

Thanks Guys

I have full manual control over the front axle actuator. I did this because I wanted to have a 2-Lo position. A side benefit is I have no power limiting in 4-Lo. I unplugged the transfer case switch wire. I have a toggle switch in the cab. The wires from this switch connect to the light/blue and black wires on the transfer case plug. By shorting the black and light/blue wires, you have full manual control of the front axle locking and the low range signal (the 3rd wire) is never sent to the computer regardless of the actual transfer case shift position. The plug is left unattached to the transfer case.

This way, I can shift the transfer case to low range without engaging the front axle. This comes in handy when backing up heavy trailers on hard surfaces. No, clutch slipping.

And I can lock the front axle in 2-Hi. This is like driving around with your hubs locked. It makes it easier to shift in and out of 4-Hi when moving. I can still make a synchronized shift from 2-Hi to 4-Hi, by shifting the transfer case FIRST, and then flipping the switch to get the front axle to lock. The "4wd" indicator light still works on the dash anytime the front axle is locked.

The only caution here is to only engage the front axle after the transfer case is in a 4 wheel position, or do it while stopped. You can disengage the front axle at any time.

To return it to stock, I could just unplug my toggle switch and plug the connector back into the transfer case, no harm no foul.

I've been wondering how to do 2low on one of these trucks. That is too easy. Nobody has answered the question of what is limited in low range yet.

The service manual says that the low range signal goes to the PCM, which alters the shift points on an automatic tranny. I notice the wiring diagram shows the low range signal going to the PCM. There is a note indicating that this circuit is for automatic tranny only. I'm not sure if it affects the engine itself, but the book doesn't indicate this. It's possible this circuit does nothing on manual tranny trucks.

The 4-Hi signal also tells the ABS that the truck is in 4wd, in addition to locking the front axle. In any case, if you do what I did, the low range signal is diabled. I still believe in running the front end for at least a few miles each month. It won't hurt by driving around with the front axle engaged in 2-Hi. This would be just like driving those Autotrac trucks around in "Auto" mode. They leave the front axle engaged and cruise around mostly in 2 wheel drive.

Another minor advantage is when the snow is patchy and I shift in and out of 4-Hi alot. I leave the front axle engaged. This makes shifting in and out on the fly much easier because you aren't really using the synchros since the shafts are already spinning at the same speed. Again, like the old days when you left the hubs locked.

The only danger I see is if you let somebody else drive your truck....If they accidentally hit your axle switch while in 2-Hi at high speed, you'd get some serious grinding.

I thought about doing the same thing that dmax403 did, for the same reason, to be able to have a 2LO. I still may do it, would probably be beneficial for backing trailers with the dual disk.

Iv thought about it but thats it, for now i just pull my fuse out now when needed!!!

Later
Caleb