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Locking Rear Differential

Discussion in 'Off-Roading & Trails' started by SearchingTacoma, Jul 10, 2008.

  1. Jul 17, 2008 at 9:06 PM
    #41
    mikesdoublecab

    mikesdoublecab LT Chase Truck

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    word... i use my locker a lot when i wheel and i offroad at least once or twice a month...

    i engage it when at a dead stop, then turn the wheel back and forth as i slowly roll forward... the light will blink if its not engaged, but when it engages, you will hear the reaf diff click and the light will go solid...

    once locked, you can drive at full speed... just remember to disengage before taking it on the street... i made that mistake once when i left the dirt to get gas and turns onroad locked are quite interesting...

    as for disengaging, i make it a habit to again come to a complete stop, then hit the button, then roll forward, turning the steering wheel left and right until the light turns off...
     
  2. Jul 18, 2008 at 7:25 AM
    #42
    piercedtiger

    piercedtiger Devout Atheist

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    Mine engages nice and smooth at 50 mph on a flat stretch of road. I've used it enough to break it in so it's a smooth transition. In fact, it kicks in faster than 4WD if I need just a little extra traction (red lights on wet pavement, steep hills, etc).

    Personally, I like having my locker in the snow. I've used it a few times on bad roads with less than perfect tires to keep the truck straight and cut the fish tailing. Granted it's a fine line between keeping it straight and power sliding, but it was better than 1 wheel spinning and pulling to the side.
     
  3. Jul 18, 2008 at 7:42 AM
    #43
    piercedtiger

    piercedtiger Devout Atheist

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    Keep in mind that while turning in 2wd the front wheels spin at a different speed than the rear. Thus the different set of tracks if you drive through water, mud, snow, etc. The rear tracks inside the arc the front wheels follow.

    Now, when you have 4wd engage the front and rear wheels are forced to try to spin at the same speed due to the drive shaft and transfer case. Nothing in the drive line allows the front and rear to have different speeds to compensate for turning. That's the difference between "4WD" and "AWD". We have a locked transfer case while AWD cars have an open transfer case that allows the front and rear to have different speeds. Some even allow you to change the power ratio from 50/50 front/rear to 40/60 f/r, etc.

    So if you're trying to turn on pavement in 4wd a few things happen:

    • driveline bind up can break the drive shaft if nothing else gives first
    • tires hop/chirp as they're forced to spin faster than they should
    • steering is harder and you may have to give it more gas to keep it from stalling or not moving
     
  4. Jul 19, 2008 at 10:54 PM
    #44
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    4.10 gears, sliders, and lots of buttons.
    That PreRunner has STREET tires? What the hell was he thinking? Looks like he chose a poor line, too. :)
     
  5. Jul 20, 2008 at 12:36 PM
    #45
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    4.10 gears, sliders, and lots of buttons.
    Ah. Thanks.
     
  6. Jul 21, 2008 at 3:34 PM
    #46
    mark155490

    mark155490 Active Member

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    ya ur right i forgot to mention it will void the warrenty on ur truck if u have one
     
  7. Jul 21, 2008 at 3:50 PM
    #47
    piercedtiger

    piercedtiger Devout Atheist

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    Depends on what you're trying to get covered under warranty. Dealer has to show your mod(s) caused the particular problem. Google the
    Magnuson-Moss Warranty Act.
     
  8. Jul 25, 2008 at 11:10 AM
    #48
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Thor

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    wat?
    unless an added option, an sr5 doesnt have a locker...the trd offroad has a locker and the trd sport has an lsd. in the 09's, i think the all have an auto lsd at minimum
     
  9. Jul 25, 2008 at 11:36 AM
    #49
    jhodge83

    jhodge83 Any dog under 50# is a cat and cats are useless... Thor

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    wat?
    all u have to do to see if u have an lsd is to look at the diff from the back of the truck and there should be an lsd sticker on it...as for changing it to a full locker, its not cheap. others have posted names/brands in here about them
     
  10. Jul 25, 2008 at 12:16 PM
    #50
    piercedtiger

    piercedtiger Devout Atheist

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    The only other selectable locker (besides the factory one) is an ARB which requires an air compressor, tank, lines, actuators, etc. The other options are various lockers that are engaged all the time, but rachet to allow the wheels to turn at different speeds while cornering.

    Either way, you'd have to replace the LSD with the locker.
     
  11. Jul 25, 2008 at 12:43 PM
    #51
    piercedtiger

    piercedtiger Devout Atheist

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    I thought the ARB was an open diff when unlocked? :confused: Either way, the factory e-locker is an open diff when unlocked.
     
  12. Jul 25, 2008 at 12:43 PM
    #52
    Khaos

    Khaos Well-Known Member

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    You can't do it (with factory stuff). The non locked rear is an 8.4" and the locked is a 8".

    Read through this thread
     
  13. Jul 25, 2008 at 1:20 PM
    #53
    Janster

    Janster Old & Forgetful

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    You are correct.

    The ARB is an open diff when not engaged.
     
  14. Jul 25, 2008 at 1:24 PM
    #54
    piercedtiger

    piercedtiger Devout Atheist

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    There is no auto locker. The factory e-locker is a push button electronic locker (which, btw, can be engaged with a screw driver if the actuator fails unlike an ARB). The LSD is simply a limited slip differential using clutch pads that will eventually wear down, and can be practically useless if you have 1 wheel in the air. The LSD will NOT lock the rear axle. Some people have gotten around that by working the brakes to slow the spin of the wheel in the air to transfer power to the wheel with traction, but it's not the perfect solution.
     
  15. Jul 25, 2008 at 2:22 PM
    #55
    piercedtiger

    piercedtiger Devout Atheist

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    Yeah, there is those as well. Don't know much about them myself.
     
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