Tony240ZT Posted February 27, 2003 Share Posted February 27, 2003 My orange turbo 240z broke the 3 speed auto that it had in it while driving hard. There are some metal peices in the pan, and there is a metalic rubbing sound when in gear. Just got done pulling the tranny, got dark before I could grab the converter. Anyways, earlier today went shopping for an auto tranny out of a 280ZX because I'd like to have over drive. Do the Maximas that have the L6 bolt into z cars, and use the same drive line spline setup? Any difference between the 280zx tranny and the maxima tranny? I saw a diseil maxima, any difference in that tranny? Most of the trannies in the junk yard have like 200K miles on them, should I not even consider one of them? I was thinking the maximas probably weren't driven as hard as the z's. Also, does the 280zx turbo tranny use the same type of drive line, and bolt up the same way? I thought maybe it had a larger drive line, kinda like the borg warner t5 tranny, but may be wrong. Is the turbo tranny stronger than the non? Anyone know where the are posted gear ratios on these things? Perhaps James T knows about these guys. Quote Link to comment Share on other sites More sharing options...
Jwink25 Posted February 27, 2003 Share Posted February 27, 2003 Hey Tony, here is all the info I can find about the 280ZX auto tranny. This info comes from a Haynes manuel. Model.............................3N71B Code number Non-Turbo...................... X2707 Turbo............................. X2770 Torque convertor code Non-Turbo...................... G Turbo............................. A Small torque ratio............ 2.0:1 Gear ratios 1st.................................. 2.458 2nd................................. 1.458 3rd.................................. 1.000 Reverse........................... 2.182 Seems like the gear ratios are the same but the torque convertors are different. The trannys have a different code number as well. My thoughts are; the Turbo auto tranny might have slighty stronger parts in it or different shift points. Since it has a differnt code for the convertor I would think that it has a slightly higher stall to it. If this is true, then I think that Nissan would have, beefed some of the internals up. Higher stall would make for a harder engagement of the tranny. So, I would think that the drum clutch packs and carrier bearings would be stronger than a non-turbo model. Might be other small changes as well. I know something about auto trannys...I rebuilt and tested Chrysler automatic trannys for a while. But, I am not 100% sure of the differences in Nissan trannys. I hope this helps some. Quote Link to comment Share on other sites More sharing options...
Tony240ZT Posted February 27, 2003 Author Share Posted February 27, 2003 Thanks.. Are the drive lines different between the 280zx na and turbo? I don't have the time or money to make a custom drive shaft. I thought the 280zx's had an over drive. 1:1 does sound like a final gear, but is there a higher over drive above that? I'm pretty sure the maxima has over drive. I'm looking for good highway mileage with good low gears. The gears in my old 3 speed nicely spaced, but third gear wasn't good for crusing above 65mph. I know the 5 speed would probably fix this problem, but I'm keeping cheap and don't want to buy a new clutch kit and resurface a flywheel. Also, not sure if a standard clutch would hold the power. Quote Link to comment Share on other sites More sharing options...
Jwink25 Posted February 27, 2003 Share Posted February 27, 2003 The info in my book didn't say anything about having an overdrive. The book I had covered years 79-83 280ZX. Again, this was taken out of a Haynes Manuel. I have that Turbo tranny in storage. My offer still stands. Thanks, Jason Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted February 28, 2003 Share Posted February 28, 2003 No overdrive on 280 ZXT's. Here is an article about putting the Mitsubishi Starion/Chrysler Conquest AT in the 280ZX... http://www.zcar.com/articles/twheel/4spdauto/ Quote Link to comment Share on other sites More sharing options...
jgkurz Posted March 1, 2003 Share Posted March 1, 2003 You might want to consider a 1984 300ZXT automatic. In 84 Nissan did not use a lockup convertor in this car but it still has the overdrive. I have put this trans in an 83 280ZXT. It's close to a bolt up with the exception of custom driveline and a fabricated trans mount. The bellhousing from the 280zx bolts right up to the 300zx trans. Let me know if you'd like more info. Regards, Quote Link to comment Share on other sites More sharing options...
Jwink25 Posted March 1, 2003 Share Posted March 1, 2003 Just wondering...is the 300ZX tranny stronger? Quote Link to comment Share on other sites More sharing options...
Tony240ZT Posted March 1, 2003 Author Share Posted March 1, 2003 Think I'm going with a 280zx NA tranny with a 6 month warranty.. May do do it right some other time, but I want to be done by wednesday. Thanks for all your suggestions. Quote Link to comment Share on other sites More sharing options...
jgkurz Posted March 1, 2003 Share Posted March 1, 2003 I can't say for sure whether the 84 300ZXT trans is stronger than the Maxima or 280ZX transmissions. I assumed because it was originally in a turbo car that it would be suitable for a 280ZXT. I had no problems with the transmission after the swap. Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted March 2, 2003 Share Posted March 2, 2003 4N71B tranny is its designation and I run one in my car. Held 475hp @wheels at the track with stock rebuild and valve body mods. Yes, the maxima jobber will bolt up, but you also need to get the maxima flexplate and converter. OD is a nice .68 for some serious highway cruising. turbo trannies are consider stronger because the drums have a snap ring located further up to allow for more clutches to be packed in. You should just be able to swap drums to the turbo jobber so you can get additional clutches into them. Good LUck. Quote Link to comment Share on other sites More sharing options...
TomoHawk Posted September 10, 2003 Share Posted September 10, 2003 Do you have some infor on the 3N71B trans that the older Z cars had? My trans guy told me he had a 4N71B (with overdrive?) he could put in with some mods, but I would hold off with that until later., because I just got the 3N71B rebuilt. Quote Link to comment Share on other sites More sharing options...
TomoHawk Posted September 11, 2003 Share Posted September 11, 2003 You can't just add a lock-up torque converter, can you? Quote Link to comment Share on other sites More sharing options...
TomoHawk Posted September 13, 2003 Share Posted September 13, 2003 Well, if you got the hp to drive a lower gear.... I think if you drive a certain speed most of the time, like 25-35 mph, then 2nd gear with overdrive would be a good comination. Quote Link to comment Share on other sites More sharing options...
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