Jatco 3N71B/4N71B (automatic trans) buildup information


  • #46
    Ah… are they hard to do? Ive honestly never even taken the filter or pan off (my dad has though…).

  • #47
    Is there anyone making big power with these tranny mods? Anyone ever break this tranny with mods and at what power? I ask beacause ive got my 84 turbo with rebuilt vg33 and supposedly "built" auto trans it chirps 2nd gear so i know its not stock but im installing a holset hx35 and trying to get at least 450whp out of it and i dont wanna spend money on having jim wolf tune an auto ecu if the trans is just gonna break on the first run
    4/87 Red turbo (DD Until the 84 is done) http://z31performance.com/forum/…p?f=13&t=25200
    86 NA Long gone
    1/87 White turbo (parted out)
    84 Turbo Vg33 holset HX35 http://z31performance.com/forum/…p?f=13&t=25315
    85 Turbo (Sold)
    93 Q45 Sold

  • #48
    So im getting this done to my auto transmission, am I going to notice any big difference?

    mods are, 3 row rad, intercooler, NA2T, and 3in stainless CM all the way through.

    am I going to be putting down some good power through the level ten mods on the trans?
    1989 Nissan 300zx Turbo "MAW Edition"
    viewtopic.php?f=13&t=10617

  • #49
    J18199 wrote: So im getting this done to my auto transmission, am I going to notice any big difference?

    mods are, 3 row rad, intercooler, NA2T, and 3in stainless CM all the way through.

    am I going to be putting down some good power through the level ten mods on the trans?
    Don't forget a good transmission cooler.
    Shiro #443


  • #50
    [quote]Rick88ss wrote:
    Originally posted by J18199
    So im getting this done to my auto transmission, am I going to notice any big difference?

    mods are, 3 row rad, intercooler, NA2T, and 3in stainless CM all the way through.

    am I going to be putting down some good power through the level ten mods on the trans?

    Don't forget a good transmission cooler.
    Will I really need one with the 3 row rad? I will probably get one because anyone knows more than I do about this, but im wondering.
    1989 Nissan 300zx Turbo "MAW Edition"
    viewtopic.php?f=13&t=10617

  • #51
    [quote]J18199 wrote: [quote=Rick88ss]
    Originally posted by J18199
    So im getting this done to my auto transmission, am I going to notice any big difference?

    mods are, 3 row rad, intercooler, NA2T, and 3in stainless CM all the way through.

    am I going to be putting down some good power through the level ten mods on the trans?

    Don't forget a good transmission cooler.
    Will I really need one with the 3 row rad? I will probably get one because anyone knows more than I do about this, but im wondering.
    Yes.
    Hmmm, Whats next?
    Full Size Bronco, smashing shit.

    84ZXT

  • #52
    I had this mod done to the auto 7/87 turbo I had earlier this year. It made a huge difference. Like adding a shift kit to a GM TH350 or TH400. I also used a brand new OEM turbo tourque convertor. I don't know about how it would hold up to additional HP because the car was stock otherwise. The transmission shop did not charge me extra to do the mod while doing the trans rebuild.



    1988 300ZX Turbo, Shiro Special #760
    1988 300ZX Turbo Automatic (wife's car)
    1991 Hard-body 2WD

    http://zccw.org/zccw/?page_id=1215

  • #53
    So the shop in town doing this for me says that he saw debris on the internals of my trans, upwards to 2400 for complete rebuild…I dont have the money and its 280 for the mod. I of course just said do the mod and put it back together, will I be ok for ahwile so I can save up for a trans from level ten?
    1989 Nissan 300zx Turbo "MAW Edition"
    viewtopic.php?f=13&t=10617

  • #54
    Hard to say if an otherwise used auto trans will hold up to a performance mod. I would not bet on it. I've had three auto trans rebuilt and never paid over $1800.



    1988 300ZX Turbo, Shiro Special #760
    1988 300ZX Turbo Automatic (wife's car)
    1991 Hard-body 2WD

    http://zccw.org/zccw/?page_id=1215

  • #55
    Well its never been terrible for me and has been strong since ive had the car, and if its anything like the engine was (didnt have to be rebuilt at all ha) then I should be ok Im hoping, and even so, if it goes, it will be sometime in KC so I will be closer to some resources.
    1989 Nissan 300zx Turbo "MAW Edition"
    viewtopic.php?f=13&t=10617

  • #56
    J18199 wrote: Well its never been terrible for me and has been strong since ive had the car, and if its anything like the engine was (didnt have to be rebuilt at all ha) then I should be ok Im hoping, and even so, if it goes, it will be sometime in KC so I will be closer to some resources.
    Im going to quote myself here and say "you F*ing retard!!!" lol…trans took a shit and lost first and second gear, is on its way to level ten to be modified and built.

    Was just wondering if anyone knows or has…any experience with their transmission in the Z? Im so excited to get it back in a week that I reaaaallly wanna know! haha
    1989 Nissan 300zx Turbo "MAW Edition"
    viewtopic.php?f=13&t=10617

  • #57
    As soon as the weather lets up I can get mine on the road to let ya know.
    Tracks here don't open again till end of April even then it is still cold to get real traction.

    I did a complete rebuild on mine and all the mods from level ten and keas, except cryo treat, and the upgraded output shaft.
    Also have a 3500 stall TQ that is waiting to be tried out.
    I got max pressure, all the cushion out of it, set-up with a b&m rachet shifter.
    88na2T-s13,q45 swap 12.6@110mph
    87T 2+2 auto,stock

  • #58
    Dmann, do you have pics of the shifter? I am interested to see what and how you did it.
    thanks.

    Sorry for the thread jack…

    Silver 86T 3" turbo back Cm exhaust ST Springs / Tokiko Blues
    87-89 turbo front hubs z32 brakes in front Z32 Master Cylinder
    Autometer boost gauge a-pillar pod, autometer oil temp and pressure.
    5zigen FN01R-C FRONT 17x8.5 245/45 REAR 17x10 285/40 rubber Kumho ECSTA ASX
    Turbo XS BC, EGRblocked off, 5% limo tint

  • #59
    What did u guys do about the ecu. Do u need to swap an auto ecu setup into a manual z or can u use the manual ecu. Also with the ugrades can u still use drive or do u have to shift manually from here on out. Its for a customer.

  • #60
    You can use a manual ECU only with a manual trans, and an auto ECU with auto and manual.
    1986 300ZX factory Turbo 2+2 5 speed swap. 1985 Toyota MR2. Floor boards gone. Good fabrication practice.