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Rough shifting

Discussion in 'Subaru Sambar' started by Dillon Nunes, Aug 6, 2019.

  1. Dillon Nunes

    Dillon Nunes New Member

    I have a 1994 Sambar 5 speed manual with extra low. 35,000kms on it. Shifting from 1st to 2nd is usually pretty rough. It usually pops into gear with a slight grind sometimes. Shifting 2nd to 3rd is hit and miss. Sometimes smooth sometimes a pop into gear. Shifting into 4th or 5th is always smooth. Same with down shifting though all gears, never have a problem.

    I recently changed the transmission oil to 80w90 mineral oil. It didn't seem to make a difference, if anything slightly worse. The oil that came out looked clean and not much for metal shavings on the drain plug.

    Any ideas on what my problem may be? Thank you
     
  2. Jigs-n-fixtures

    Jigs-n-fixtures Active Member

    Are you sure the clutch is working right?
     
  3. Maximal

    Maximal Member

    hope you used GL-4 gear oil, because GL-5 has sulfur compounds that will absolutely chew synchros in old transmissions

    otherwise ive never used 1st gear in these trucks, even trying a 1-2 shift feels notchy in every Sambar ive owned. i always take off in 2nd gear and barely if ever use 1st
     
  4. Dillon Nunes

    Dillon Nunes New Member

    I'm pretty sure my clutch is working right as it shifts fine in other gears. Might be worth trying to adjust it and see.

    I did use GL-5 gear oil. I only have out on maybe 150 kms though since the change. I didn't realize it was bad for it. The guy behind the counter said GL-5 can be used for GL-4 applications.

    I usually start in 2nd too but still thought it should shift smoothly
     
  5. Maximal

    Maximal Member

    GL-5 even if it says works with GL-4 cannot be used for GL-4 in older transmissions, is still has the sulfur in it that wears brass synchros. Have to use straight GL-4 gear oil only like Redline MT-90. if it had GL-5 before this as well, i can near guarantee the sulfur in the gear oil had a ball with the synchros and theyre worn causing the issues.
     
    Last edited: Aug 7, 2019
  6. Ohkei Dohkei

    Ohkei Dohkei Member

    You should be able to tighten your clutch cable a little bit and see if it gets better. Could be that your cable has stretched a little over the years.
     
  7. Jigs-n-fixtures

    Jigs-n-fixtures Active Member

    The higher gears should be fully synchronized, and first may not be. Or if synchronized the synchronizer rings could be wearing. A slightly dragging clutch, which isn’t fully releasing, is noticed the most in the lower gears.

    I used to have a roommate who was a line mechanic at a Toyota dealership. He specialized in clutches and transmissions. He would to get a couple of cars a week with 1-2 shifting problems, which were corrected by adjusting the clutch. On about half, he’d have to replace the clutch and resurface the flywheel, because they waited too long to come in.

    I used to be able to shift my old Dodge from gear to gear without using the clutch, once I had it rolling, just by matching the rpm, as I went through neutral.

    Easiest way to tell, is to start in first gear with the clutch depressed. Then shift to neutral and leave the clutch depressed for a about 30 to 40 seconds, and then shift back to first. If the clutch isn’t fully disengaging you will have spun up the transmission, and will hear a down shift whine, or grinding as you shift back into first.
     

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