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  • Automatic Transmission Failure

    It is likely in bad shape, and the cheapest way to repair it will be to find a good used auto (good luck) or convert to a 5sp.
    Chuck Stong
    300+ Parts and Performance owner
    http://www.300-plus.com
    2002 ZCOT president and always active member

  • #2
    Wow, that is a bit strange. I would bet the transmission has internal damage of some kind.

    Firehawk is correct, any service work you could do for the 4n71b is probably going to cost you more than a manual conversion or replacement auto trans.

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    • #3
      If you do go back with an auto, be sure to add a tranny cooler.
      Chuck Stong
      300+ Parts and Performance owner
      http://www.300-plus.com
      2002 ZCOT president and always active member

      Comment


      • #4
        I'm guessing this isn't what you want to hear, but 5sp swaps aren't too hard

        On the other hand I have an 87 NA auto i'll sell you for almost nothing. It has 155,xxx miles on it and had lockup troubles when removed so it's not your best investment unless you are looking for a good core to rebuild or beef up. Been stored inside; only out of the car for about 2 months now.
        My beloved Z:1987 2+2 NA2T w/30a swap.
        My black sheep: 88ss parts car (pretty much stripped and gone)
        207k miles and counting. Turbo'd since 155k.

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        • #5
          If you are anywere near Santa Barbara, I'll hook it up with a 20 dolla transmission

          Terrible idea putting those wheels on...

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          • #6
            13psi on an original factory automatic? No wonder! To be honest you're lucky it even lasted this long. As others have said your cheapest option is going to be a manual conversion, the only other smart thing to do would be to rebuild it entirely which will cost close to 2 grand.
            http://youtube.com/c/zcartube

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            • #7
              I got a 84 automatic tranny, i can sell you sitting inside the car still only has 96k miles on it car isnt running but the tranny worked fine.

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              • #8
                I don't think there's any way for us to diagnose your problem from here. Although I'm dying to know what the problem is and how you could fix it. I too have an auto and want to keep it that way. That's why I plan to get a TC and 30k tranny cooler. I'm willing to bet that heat was your problem, as it is commonly. If you plan to get another auto, invest in a cooler.
                There's places that won't charge you much, if anything at all, to open it up and diagnose the problem. I'm hoping you'll do that since a lot of us here would probably like to know.
                1987 300ZX Turbo - http://www.z31performance.com/forum/vie ... php?t=3114
                2001 Tiburon Turbo 60-1 270whp/268tq

                No cupholders? Where am I gonna put my beer????

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                • #9
                  A local guy had his "upgraded" by them. See what they say about that.
                  1987 300ZX Turbo - http://www.z31performance.com/forum/vie ... php?t=3114
                  2001 Tiburon Turbo 60-1 270whp/268tq

                  No cupholders? Where am I gonna put my beer????

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                  • #10
                    300zxt wrote: 13psi on an original factory automatic? No wonder! To be honest you're lucky it even lasted this long. As others have said your cheapest option is going to be a manual conversion, the only other smart thing to do would be to rebuild it entirely which will cost close to 2 grand.
                    Funny, tehpopa's automatic seems to be holding up just fine so far. I did switch out to HD John Deere tractor fluid to cure some high gear slippage it was getting. It's a good trans so I'll get to see where it really starts to give up. I think it has to do with how they are taken care of and not overheated. Overheated ATF looses 90% of its lubricative properties, and should be replaced immediately if it is ever overheated.

                    Bernardd is also running a modified 3N71B at probably over 400whp, I think all he did was an old B&M shift kit and tractor hydraulic oil? There's info in the automatic buildup thread.

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                    • #11
                      [`

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                      • #12
                        If you got a big enough tranny cooler w/fan and temp gauge, and watched the temps, then you'll never have a problem with any kind of fluid you put in it. Flex-a-lite's fan kicks on when the temps go above a preset. Set it to around 180.

                        This one is a monster and should be more than enough for racing:
                        http://store.summitracing.com/partdetai ... toview=sku
                        Attached Files
                        1987 300ZX Turbo - http://www.z31performance.com/forum/vie ... php?t=3114
                        2001 Tiburon Turbo 60-1 270whp/268tq

                        No cupholders? Where am I gonna put my beer????

                        Comment

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