Why wouldn't my D2 unstuck itself ?

[jhk07]

Entered a creekbed. Trailer hitch ended up in the bank keeping my two back tires elevated off the ground. The 2 front tires were on creek gravel and for the life of me would not fucking grab and pull me out.

The only tire that moved was driver rear, and it would just spin air and water. At idle it moved, gave it gas, it moved.

i tried left foot braking and all that crap.
CDL was not locked. My abs does work, no amigos.

finally put a piece of wood under the ONLY tire that would move and got out.....

WTF happened here????

 

[capri_auto]

Should have used CDL

 

[rovercanus]

What happened is you don't have an understanding of how 4 wheel drive works with open diffs. Some left foot brake modulation would have help get you out of that situation.
Do a search on here and it is explained in detail, once you understand what it will do, you will better be able to control it.

 

[jhk07]

Should have used CDL

Well, i was just at a buddys house..... and I shoulda just used the bridge.

it was not an offroading trip. I was just screwing around. I would have got pretty wet locking the cdl....

 

[jhk07]

What happened is you don't have an understanding of how 4 wheel drive works with open diffs. Some left foot brake modulation would have help get you out of that situation.
Do a search on here and it is explained in detail, once you understand what it will do, you will better be able to control it.

as always I appreciate your input..... There is some truth to what you say.


now go read the 3rd paragraph of my original post

 

[jlprice]

CDL and some sort of lockers front and rear would have been a big help. Or a winch might have pulled you till you had all 4 wheels down. or pile rocks, or dig, or...

Sounds like wheeling, what was the question again?

 

[rovercanus]

as always I appreciate your input..... There is some truth to what you say.


now go read the 3rd paragraph of my original post

Sorry, I somehow missed that. I've used brake modulation plenty of times with good effect.
It's nice to be appreciated.

 

[jhk07]

Sorry, I somehow missed that. I've used brake modulation plenty of times with good effect.
It's nice to be appreciated.

I was really pissed at my D2. I prol need more practice at the left foot braking..... but i was doing it, and those fuckers (front tires)were not grabbing.


I cant afford a locker... I gotta get my rusty bumper sandblasted

 

[brushogger]

CDL was not locked. My abs does work, no amigos.

WTF happened here????

Why not? That's what it's there for. :banghead: That's like me saying it was in fwd , but the front hubs weren't locked on my old fj40. Well.... kinda' like that.

 

[rovercanus]

Because on a 2000, the cdl is on the transfer case but can not be actuated from the cab. I don't use mine most of the time even though I can turn it on and off.

 

[jhk07]

Because on a 2000, the cdl is on the transfer case but can not be actuated from the cab. I don't use mine most of the time even though I can turn it on and off.

Ditto. 10mm i think. Hell, I had two perfectly good Cooper STT/c s on the ground.

 

[brushogger]

Because on a 2000, the cdl is on the transfer case but can not be actuated from the cab. I don't use mine most of the time even though I can turn it on and off.

Oops! Totally missed that one. Sorry. My Bad.

 

[sven]

Just do the D1 linkage swap and be done with it. Should cost around 100 bucks or so.

 

[mgreenspan]

Wait a second... This guy called me an idiot in the RTE thread?

 

[Agent]

Ditto. 10mm i think. Hell, I had two perfectly good Cooper STT/c s on the ground.

The problem is that you only had the front two tires on the ground. TC is a poor substitute for CDL and lockers.

Its very easy to rig some sort of linkage to allow CDL to be engaged more easily. I had enough scrap laying around the shop to fix up a lever like shown in the tech section. One of these days I'll get around to rigging up something that will allow me to engage it from the cabin. IMO, CDL is the first thing someone needs to do to their truck if they intend to do much wheeling at all.

 

[p m]

i tried left foot braking and all that crap.
CDL was not locked. My abs does work, no amigos.

(a) I don't know how left foot braking works on ETC truck. From what I heard before, it doesn't.
(b) on a rig with open differentials left-foot braking won't do much more than controlling your motion (if you're in motion, that is). It won't get you unstuck.

If (b) sounds wrong, here's why (example for an axle with one tire without traction and open diff, exactly the same logic applies for an open center diff and one axle without traction):
- an open differential splits torque equally between two wheels. If one wheel has no traction, it takes almost zero torque to spin - therefore, the other tire receives almost zero torque as well.
- now, you apply brake pressure - meaning now your wheel that had no traction has to overcome the brake torque to spin. We assume that brake torque is equal side to side; since the wheel in the air has brake torque to work with, just as much is delivered to the other side (that has traction). But, the total amount of torque delivered to the other side is zero (+ brake torque - brake torque) = 0.

Ever since I was a kid, I heard stories about how a parking brake could save you when you get stuck. Ever since I started driving (a RWD sedan) in mud, I wondered how come I couldn't get any benefit from the parking brake - until I gave it a thought.
The only difference could be if you nail the throttle - it takes more torque to spin up a wheel without traction, and just as much will be sent to the other wheel. Which may just be enough to get you going.

Garrett can wax lyrical about how they teach their students brake modulation and how well it works. With open diffs it is fiction.

 

[teledan]

...two back tires elevated off the ground... CDL was not locked.

Thats your problem. If the center differential is not locked and you lift your two back tires off the ground they will just spin. And if the diffs at your axles are not locked and you just lift one tire off the ground it will just spin.

To prevent this from happening in the future, just do the obvious. Either cut your trailer hitch off or buy a winch

 

[jhk07]

Thats your problem. If the center differential is not locked and you lift your two back tires off the ground they will just spin. And if the diffs at your axles are not locked and you just lift one tire off the ground it will just spin.

To prevent this from happening in the future, just do the obvious. Either cut your trailer hitch off or buy a winch

those trailer hitches and rear steps are stock rear bumper savers.

I have always been told about left foot braking. Maybe my technique is bad. I have done that same crossing before, but the characteristics of the creek/ bank obviously had changed.

 

[Quentin]

Turf the bloody tow hitch and rig up a D1 CDL linkage.
If you want to play off road, at least give the truck a chance to perform

 

[Roverrocks]

Must have a working CDL! Must! One can install lockers front and rear but without a functional, working CDL the lockers are worthless. Must lock the 2 axles together with a CDL to have any capability off road. Single best thing you can do on your D2. Not having a CDL on a D2 is like off roading a D1 in low but W/O the CDL locked. Little off road capability on a D1 W/O the CDL locked in. I have ARB's on my 97 D1 but they are worthless W/O locking the CDL. Anytime I go wheeling I go to CDL locked low. I never go into CDL unlocked low offroad. No point to doing that. As far as a trailer hitch point I have one with a D ring on it and the hitch point functions as a skid plate for me coming off rocks or ledges. The CDL is worth it's weight in gold. Get one.