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Tuff Shift

This is a discussion on Tuff Shift within the Manual Transmission forums, part of the Drivetrain category; I've noticed when I shift my 6 speed it's seems firm. Do I need to add anything to the transmission ...

  1. #1
    Junior Member enjun's Avatar
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    1999 SS SLP#1507

    Tuff Shift

    I've noticed when I shift my 6 speed it's seems firm. Do I need to add anything to the transmission oil (check it was full) but the oil is 8 years old and 60k on it. Any suggestions

  2. #2
    Moderator Firebirdjones's Avatar
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    I personally change my manual transmission oil on a regular basis. After 8 years and over 60,000 miles it would be WAY past my interval for changing.
    I generally do mine about every 20,000 miles or so,,,which tends to be every other year or so. Thats just me though.

    I couldn't tell ya what the service manual recommends, I run my own maintainance schedule that is much sooner than recommended on just about everything,,,,but I'm willing to bet it tells you to go much farther than 20,000 miles. It's up to you.

    Might also be time to flush out the slave/master cylinder and add some new fluid there as well. Thats something that is very often overlooked. After 8 years of warm and cold cycles I am sure it has some moisture in it.

  3. #3
    Junior Member enjun's Avatar
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    What kind of oil do you use and is it hard to change.

  4. #4
    Moderator Firebirdjones's Avatar
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    The 6-speed takes Dexron III automatic transmission fluid.

    I put synthetic Dexron in mine which seems to be hard to find around here. Synthetic Dexron is only in a couple brands around here so I went with Mobil.

    It's easy to change,,,,simply remove drain plug at the bottom of the trans and drain. Reinstall plug. Remove fill plug on the side of the trans and refill.

    Fill to the bottom of the fill plug and your done. Hope that helps.

  5. #5
    Junior Member 2002Sebring1sc's Avatar
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    2002 Z28 1SC

    Yes - I would start by changing the fluid. I am also running Synthetic Dexron. I have already lost 1 Tremec 6 speed; it's in a crate under my workbench. That cost right at $2500 shipped. It happened at 70,000 miles. It started getting hard going into reverse, and then I noticed a grind now and then going into second. Then finally one night I was racing a Jag down a local canyon and running between 110 and 130 in 5th and when I came out of the canyon (first) I had no 6th. Needless to say I take care of my trany NOW!

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