LSD or not

Discussion in 'Engine & Performance' started by Doodoo972, Apr 15, 2019.

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  1. Doodoo972

    Doodoo972 Member

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    I wanna change my diff oil but I'm not sure if it is a LSD or not. It's a 2WD with a 3.55 axle ratio and when I check with my VIN I find this:

    DBA ALL AUTOMATIC TRANSMISSIONS
    DG1 6-SPD AUTOMATIC 645RFE TRANSMISSION
    DMD 3.55 REAR AXLE RATIO
    DRN 245MM REAR AXLE
    DS8 CONVENTIONAL DIFFERENTIAL REAR AXLE ----> seems not to be LSD

    What do you think guys ?
    Which oil I have to use ? 75W140 but I don't need to add the LS additive?
     
  2. Burla

    Burla Senior Member Military

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    Open, you wont need additive. I don't know if they put lsd on the addon side of the sticker or not, Anyhow, either way lsd or not this oil will work. gl-5 hasn't been updated for many many years, so they don't update oem's because it is still the same oil. You san email Dave at redline, he would give you exact info. That is the oil that I know a lot of guys run in the open diff or lsd, and on specs section is spec'd for Ram.

    [email protected]
     
    Last edited: Apr 15, 2019
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  3. misfit77

    misfit77 Senior Member

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  4. smurfs_of_war

    smurfs_of_war Senior Member

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    You have an open diff (mentioned already)

    I don't believe the friction additive is required in the anti spin (LSD) since it is a helical style rather than having clutches- so don't sweat it.

    Open to correction if I am wrong.

    Sent from my SM-G950W using Tapatalk
     
  5. crash68

    crash68 Senior Member

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    The OP has a 1500, they have clutch type LSD from the factory. The Helical gear style LSD are on the HD trucks.
    Any of the good synthetic axle gear lubes are available with the friction modifier already added and it doesn't hurt anything to run it in open or gear type differentials.
     
  6. Doodoo972

    Doodoo972 Member

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    Ok thanks guys for the advises but what is the difference between limited spin and open differentials?
     
  7. crash68

    crash68 Senior Member

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    A limited slip uses either clutches or gearing to distribute torque to both wheels. Power will be sent to both wheels irregardless of traction. If you do a burn out, you'll get two black marks from the tires.
    With an open differential, the wheel with the least amount of traction will spin. If you do a burn out, you'll get one black mark. Usually the right wheel spins due to rotation direction of the driveshaft "lifting" the wheel up.
     
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  8. misfit77

    misfit77 Senior Member

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    Plenty of videos on YouTube, but this is my favorite on how a open differential works.

    Sent from my moto g(6) using Tapatalk
     
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  9. RLJ10X

    RLJ10X Senior Member

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    2WD with a 6 speed? Do 4.10s and a LSD. You'll thank me later.
     
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  10. DodgeDude99

    DodgeDude99 Senior Member

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    Do you leave 1 stripe or 2 stripes if you do a burn out?
     

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