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Unread 03-04-2007, 10:10 AM   #1
JimP
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Dumb question about lockers on Rubi

Hi guys:

I never had lockers on a jeep before, so I know this question will sound dumb.

I am still thinking about getting a Rubi..... can you tell me if you can engage the lockers in 4 wheel high, or must you be in 4 wheel low?

With the lockers engaged, you have posi traction with both the front and rear axles correct? And I presume you can only go so fast?

In a auto tranny would you just keep it in drive, when in 4 wheel low and lockers engaged?

Regards.... Jim P.

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Unread 03-04-2007, 10:14 AM   #2
crankitdb711
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only 4Lo...
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Unread 03-04-2007, 10:39 AM   #3
Bigdog05
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In 4 low you can use any gear you might need for what you are driving through.
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Unread 03-04-2007, 10:59 AM   #4
wvextremist
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There is a wiring mod out there that you can do so that you can use the lockers and the sway bar disco with any transfer case setting...
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Unread 03-04-2007, 11:16 AM   #5
DirtyJeepJK
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Quote:
Originally Posted by JimP
Hi guys:

I never had lockers on a jeep before, so I know this question will sound dumb.

I am still thinking about getting a Rubi..... can you tell me if you can engage the lockers in 4 wheel high, or must you be in 4 wheel low?

With the lockers engaged, you have posi traction with both the front and rear axles correct? And I presume you can only go so fast?

In a auto tranny would you just keep it in drive, when in 4 wheel low and lockers engaged?

Regards.... Jim P.
4lo only...

you can lock just the rear lockers or the front and rear together...

if i had the auto i would shift it myself i think, but that's just me. i have the 6sp.
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Unread 03-04-2007, 12:27 PM   #6
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No posi traction. The diffs are open when unlocked
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Unread 03-04-2007, 01:46 PM   #7
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Quote:
Originally Posted by wvextremist
There is a wiring mod out there that you can do so that you can use the lockers and the sway bar disco with any transfer case setting...
Not so sure that the TJ wiring mod will work with the JK. I pulled everything apart and the switchs for the Lockers, disconnects, and ESP are all using one set of wires that run into a small circuitboard insted of being wired independantly. I'm not an electrical mastermind, but I'm gonna have my friend that is incredible with electronics take a look at it.
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Unread 03-04-2007, 02:27 PM   #8
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You cannot do the modification at the locker switch any more. The switches communicate with the computer using the CANbus system (two wires).

Here is a write-up from another board. I have not done this yet. One guy on another board has done the modification to ground the transfer case position sensor and he says it works great and has not had any problems or trouble codes.

Here is the link: Rubicon Locker Modification
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Unread 03-04-2007, 05:20 PM   #9
mountravlr
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4 lo only

4 lo with the lockers is about 15 mph max, reserved for the worst trail conditions. The sway bar disconnect is good to about 18 mph max. The owner's manual warns about excessive speed in 4 lo
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Unread 03-05-2007, 08:47 AM   #10
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Quote:
Originally Posted by mountravlr
4 lo with the lockers is about 15 mph max, reserved for the worst trail conditions. The sway bar disconnect is good to about 18 mph max. The owner's manual warns about excessive speed in 4 lo
damn is 15mph all a Jeep can manage????

Surly that's not right, I can easily top over 40mph in low range in my Discovery, admitidly it's not often needed but wheels speeds above 15mph are often required in deep mud.
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Unread 03-05-2007, 09:29 AM   #11
JoeBlevins
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Quote:
Originally Posted by 300bhp/ton
damn is 15mph all a Jeep can manage????

Surly that's not right, I can easily top over 40mph in low range in my Discovery, admitidly it's not often needed but wheels speeds above 15mph are often required in deep mud.
The 4Lo is dramatically different in the Jeep. You aren't supposed to be going for wheel spin in 4lo. Mudding is 4hi.
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Unread 03-05-2007, 09:59 AM   #12
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Quote:
Originally Posted by JoeBlevins
Mudding is 4hi.
Not some of the places I go, steep slippy slopes down and side slopes you want low range for sure.

With a high revving V6 (compared to my diesel Land Rover) low range in a JK simply must offer better than 15mph, espcially when you have a 6 speed gearbox.


You certainly wouldn't want high range here, but you'd also need more than 15mph wheel speed:
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Unread 03-05-2007, 10:31 AM   #13
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WHAT!! haha, i can only laugh at the comment about needing 4low in mud. You should never need 4low in mud if your gearing is right for the tires your running. ie, i can see 4low in a jeep with stock gears and 37s, but if you have a 35" or lower tire, you dont need 4low. why you ask, 1: 4low offers to much torque for mud, your just going to spin your tires...not fast, your lugs are going to cake up, and your going to sink. Every truck has enough power to spin the tires in 4hi, so why do you need more torque, its like saying 4low is going to make you move better on ice...it isnt, torque doesnt matter on slippery surfaces, its HP guys, wheel spin, and anything out there has enough "torque" to get the wheels up and moving on slippery surfaces. And just so you know your 4low 5th gear is equal to your 4hi first gear, these things are torqued way down compared to discoverys. so if and when your in 4low in mud now your only dealing with basically 1 gear, vs in 4hi 3 gears. use 4hi, you get more wheel spin to clear out the lugs, and if you start boggin down, you can downshift to a bette gear and get your wheel speed back up. It always amazes me about the people who think they need 4low, its so funny to go wheelin with people and watch them freek out at a mud hole, and go "hurry put it in 4 low hurry"...buddy your not going anywhere calm down...haha. But seriously, try using 4hi in these jeeps, they dont weigh much, and like to float, get some wheel spin and floor it if need be, you will make it alot further and wont get stuck as much
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Unread 03-05-2007, 10:38 AM   #14
mountravlr
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Quote:
Originally Posted by 300bhp/ton
damn is 15mph all a Jeep can manage????

Surly that's not right, I can easily top over 40mph in low range in my Discovery, admitidly it's not often needed but wheels speeds above 15mph are often required in deep mud.
Keep in mind that the engine is turning 2-3 times the revs in 4 lo than it does in 4 hi, and that is why the owner's manual makes those warnings.
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Unread 03-05-2007, 11:22 AM   #15
300bhp/ton
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Quote:
Originally Posted by bofer84
WHAT!! haha, i can only laugh at the comment about needing 4low in mud.
Sorry mate but you evidently have no idea at all.

In the pic I posted they had just gone down a near vericle downslope and under them is a 3' deep trench they managed to power over. Hi range simply would not give the control not to mention would be sucicidel navigating steep slopes with it.

In a competition trial you can't stop as it's a penalty but you'd be mad or an idiot to use high range:






If it was on the level and was simply a mud hole with dry grippy areas at each end then maybe, but when navigating tight gates, sideslopes, very steep decents & cliams all in the mud then low range is the only answer, even for a Jeep.
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