Trans Oil?

Discussion in 'U-shift em' started by NoVA_69_GS350, Dec 29, 2020.

  1. NoVA_69_GS350

    NoVA_69_GS350 Well-Known Member

    This weekend I pulled the engine and trans from my 69 GS 350. It has what I believe, but may be wrong, 66 M20 in it. Prior to pulling I read to drain trans oil or it'll get all over the place. So I pulled the fill plug (square bolt) on the passenger side of trans about half way up, to see if anything would come out, nothing did. Didn't stick my finger in there to see if I could feel the fluid, I know I should have. Decided to pull trans anyways and just put a drain pan where the drive shaft meets the trans (not sure what it's called). Pulled it all the way out and i got may a drop of two of fluid. Was expecting much more. This common? Could this mean that I dont have any/much trans fluid in there? Anything specific I should check for?
  2. 71gs3504sp

    71gs3504sp Well-Known Member

    Once the trans is out, pull output shaft then tilt it, it should all come out now if any, hopefully!
  3. David Hemker

    David Hemker Well-Known Member

    Make sure to use GL-4 gear lube. Do NOT use any lube that has GL-5 on the bottle. GL-5 gear lube is missing important additives to protect the brass suncho rings.
    71gs3504sp and TrunkMonkey like this.
  4. TrunkMonkey

    TrunkMonkey Well-Known Member

    Yep. I used Driven GL-4 in my T-10.
    71gs3504sp likes this.
  5. 71gs3504sp

    71gs3504sp Well-Known Member

    Not to many gear oil GL-4 is made for our Muncie. The only one I use and never had a problem is Sta-Lube GL4 (85W90). I still have my original Muncie in my 71 GS350 4 speed car and it still shifts like butter!
  6. GS464

    GS464 Hopelessly Addicted

    Answering the OP's original question, if your driveshaft was out and there was no yoke on the output shaft when you pulled the engine/transmission, and assuming that you had to have a pretty good angle on them coming out, you should have poured quite a bit on the ground. So, yes, it was low, very low on gear lube. You may want to take the side cover off and look at the gears/synchros for abnormal wear. From your description,
    the plug you pulled out actually WAS the fill plug which works like the fill plug on the differential. (Pull it out, check for fluid with your finger, add till it just runs out). Hopefully you won't find much wrong.

    Were you having any shifting issues like popping out of gear, hard to shift, grinding, etc?
  7. NoVA_69_GS350

    NoVA_69_GS350 Well-Known Member

    @GS464 thanks for the reply. So when i pulled the motor and trans the front end was gone so not much of an angle. I pulled the plug and stuck my finger in there, didn't feel any trans oil. From watching videos i assumed the oil would come pouring out, but nothing did. When i took it home i did notice some oil on my trunk mat, not much though. I'll open it up and take a look at the gears. Not real issues with shifting but i only drove it for about 2 hours prior to starting my tear down.
    Last edited: Jan 23, 2021
  8. 69GS430/TKX

    69GS430/TKX Silver Level contributor

    If you have it out of the car, can't you just turn the trans over on its side, and see how much oil comes out of the open fill hole?

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