Need help with gear oil selection

Manual Transmission & Clutch Discussions

  1. duster360

    duster360 FABO Gold Member FABO Gold Member

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    I just rebuilt my 4 speed and need some gear oil for it. The oil in the picture is what Brewers performance sells for mopar 4 speeds. Anyone seen an oil with the same gl-4 rating at their local autoparts store. I would like to buy it locally if possible. It does not have to be the same brand as this. The ones I have seen online at the local parts is either Gl-5 or Gl-4/Gl-5.

    [​IMG]GL4SL ONE GALLON STA-LUBE 85W-90 WEIGHT GEAR OIL
    [​IMG]One gallon jug of Sta-Lube 85W-90 gear oil, GL4 specification (with no friction modifiers) as recommended by Mopar. Services all A833 4-speeds with a little to spare.
    GL4SL ONE GALLON STA-LUBE 85W-90 WEIGHT GEA
     
  2. DaveBonds

    DaveBonds Garage Trash

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    I think that a synthetic oil in a manual transmission does wonders for them, because they aren't temp controlled like an automatic.

    I plan on using Redline MTL, because the viscosity doesn't change as much from cold to hot and back, compared to a crude base oil, which means you will see more consistant synchro speeds under different driving conditions and more consistant shifts, as well as less wear on the brass synchros, because most GL-5 oils have sulfur reactors in them that are corrosive to brass.

    [​IMG]

    http://www.redlineoil.com/product.aspx?pid=45&pcid=7

    Worth the penny.
     
  3. 1970Duster

    1970Duster Well-Known Member

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    The gl5 is an additive for the limited slip unit in the rear end. 80w90 will be just fine. Personally I'd use 80w90 full syn if has just been fully rebuilt with new gaskets.
     
  4. duster360

    duster360 FABO Gold Member FABO Gold Member

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    Looks like I definitly need to stay away from the Gl-5.
     
  5. duster360

    duster360 FABO Gold Member FABO Gold Member

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    I have no problem going with synthetic if it is ok to run in this old transmission. I completely rebuilt it. All new bearings and bushings, new synchros, new 3rd and 4th gear and new shift forks.
     
  6. duster360

    duster360 FABO Gold Member FABO Gold Member

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    I noticed some of the synthetics have GL-5 in them also.
     
  7. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

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  8. pntastar69

    pntastar69 Well-Known Member

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    As stated above, 80w90 will be just fine.
     
  9. RustyRatRod

    RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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    Yup. No need to get enamored with new and improved stuff. 90 weight has been doin the job for over 100 years.
     
  10. scremn

    scremn Well-Known Member

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    I use what they recommend. You can buy that at NAPA.
     
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    • sireland67

      sireland67 Well-Known Member

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      This is what I use in mine, it will run you about $50.00 to fill it up, but the tranny will shift alot better than standard gear oil.
      Plus it will not corride the brass sycro's like 90W will.
       
    • DaveBonds

      DaveBonds Garage Trash

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      It lasts longer between changing as well, because of the more consistant viscosity properties that do not change as much under load, shock and heat.
       
    • sireland67

      sireland67 Well-Known Member

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      FYI
      Amazon has the best price on redline that I can find.
       
    • sireland67

      sireland67 Well-Known Member

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      Syncromesh is another great fluid, it is OEM reccomend in most modern mopar standard shift trans, but the cost is really high.
      My tj jeep says this fluid only, or bearing failure will result.
      $20.00 a quart unless you guys know where to get it cheaper.
       
    • duster360

      duster360 FABO Gold Member FABO Gold Member

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      Says $7.99 on their website for pennziol synchromesh.
       
    • matty mopar

      matty mopar Well-Known Member

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      Does the GL5 definitely dissolve the brass syncros?
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      90 weight doesn't dissolve anything.
       
    • EL5DEMON340

      EL5DEMON340 Well-Known Member

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      stay away from the GL5, the redline is good i use passon's fluid
       
    • 1973dusterkid

      1973dusterkid Watch This

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      I have been using 80w90 advance auto brand no problems so far.
       
    • WildCat

      WildCat Well-Known Member

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      It has been a long time but thinking the guy that rebuilt my

      18 spline HEMI 4 speed out of a 440 6 Pak Cuda that had every other tooth on the synchro removed ( was in drag car before I got it) told me to use automatic trans fluid

      Drove my 340 Challenger on the street for 17 years yeah needed new synchro but was fun for many years

      I did put regular gear lube in my Dart 4 speed

      Guess it depends on what you are going to do with it
       
    • Johnny Dart

      Johnny Dart Well-Known Member

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      First off stick with GL4....Period. It is designed for our soft metal,brass,transmissions. It has become harder to find because of the changes of materials in the newer transmissions. But it's out there.

      If you want that trans to shift like butter,go with Redline Mt-90.
      It is Gl4 rated,synthetic.Your trans will run cooler and shift like a new car.
      I would not use anything else.
       

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    • oldkimmer

      oldkimmer FABO Gold Member FABO Gold Member

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      ...............................With me being old school and all, mopar always recommended ATF back in the day, we never had any problems back then,does no 1 use atf anymore,,,,,,i was told never to use synthetic in them...........kim.......
       
    • RustyRatRod

      RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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      Yup. ATF is the first factory recommendation. You just caint convince some people not to latch onto to the latest and greatest. So I'm just gonna quit tryin. lol
       
    • Abodybomber

      Abodybomber Breaking street machines , since 1983.....:) Legendary Member

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      ATF formulations have changed BIG time,in the last 10 years ago,much less 30 or 40. Ran into this a while back,as a parts guy. Seems air cooled V
      W.'s required a GL4 ,just like the Mopars did. Sta-Lube,is the last true GL-4 brand left. The VW guy I know,says that only. The synthetics ,do have benefits. Brewer's, knows his stuff. Red line or Sta -Lube,would be my choices.
       
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s FABO Gold Member

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      I run Dextron II. Since the 70s.In all my A833s. Tried synthetic. Didnt work for me,too slipery.Syncros took forever. I modded my cones and blocker rings in an effort to make it work. Eventually switched back to ATF. The mods worked great for ATF too.I splash a little gear lube in some of them;depends how I feel. Maybe 20%. It is possible to make these A833s shift like lightning, even at 7000 plus rpm.Those gears are heavy.Cheers
       
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