To my knowledge, from what I could find, the only 4 speed automatic that will bolt up to a 240-280 is the one from an '84 Nisan Maxima.

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'71 240 Z

as far as i know there is no 4 speed auto that will bolt up to a l6 motor. the '84 maxima is a front wheel drive with a v6 motor. with a l6 motor your choices are 3 speed auto, 4 speed manual or 5 speed manual. your best choice would be to just buy my car and call it a day!! lol mike

Don't forget the Maxima was a rear wheel drive vehicle at first and I believe 85 was the first year for the V-6 front wheel drive. This is a curious question I'd like to know myself. For now, when I go to work can take my L series bell housing and match it up to the V6 I have and see if lines up, and the pilot hole fits the input shaft.

....and the number and length of the splines are correct............
~Rick~

I was told by a Z store in Ca. that the '84 gas Maxima was the only 4 speed automatic that would bolt up to a straight 6 block.
Irv

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'71 240 Z

Hi Irv:
I think it's 83 and 84 - L4N71B Four Speed Automatic. They seem to have slightly different 1st and 2nd gear ratio's...but 3rd and 4th are the same.

FYI - a Post by Kim Blough is copied below - from the Old Z Car List. Kim really knows his stuff...

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Date: Sat, 26 Mar 2005 23:48:45 -0600
To: z-car@taex001.tamu.edu
From: "Kim Blough" <Smokyyaro@velocitus.net>
Subject: Re: <L6> L4N71B Four Speed Automatic conversion



Hi All, (Jason, this one is for you

With the introduction of the 1983 model year, Nissan offered the =
four speed automatic.

The more I read about this transmission, the more I realize how neat =
it really is and how it could be a potential performer for both power =
and mileage.

The trans uses a standard "lockup" style hydraulic solenoid control =
for the converter which is factory wired for externally lock up control. =
(Overdrive "cancel" switch is stock and could be retrofitted into any Z)

The really neat thing is the overdrive ratio. These transmissions =
have a 0.686:1 OD fourth gear!!!

A 31.4% OVERDRIVE! Bring on the HP!

Quote: "...this drops engine speed by approximately 30% as compared =
to the third speed range".

The stall "torque ratio" is 2.0:1 which means that it has room for =
improvement as far as stall RPM goes.

We routinely cut domestic converters apart and change the stall =
ratio to fit our needs. The idea of modifying a stock Nissan converter =
to allow a first gear (unlocked converter) to flash to say 2500 to 3000 =
RPM is not out of the question.

With the advent of the "lockup converter" (which acts like a manual =
clutch, transferring 100% of all engine RPM to the transmission), a =
high(er) stall converter allows the hotrodder to literally "Have his =
cake and Edith too.

Both the driver and "Edith" will probably enjoy the reduced =
interior cabin noise levels which may allow you to hear conversation at =
normal levels.

The car would launch quickly using this combination of RPM and =
torque increase. This is real live torque increase, something which no =
manual clutch can do. (Jason, you won't have to "do it in the dirt" =
anymore!)

There appears to be two sets of overall gear ratios available.

One set is: (first through fourth and reverse is listed last)

2.458, 1.458, 1.00, 0.686, 2.182

The other is:

2.842, 1.542, 1.00, 0.686, 2.400

Combined with a 3.90:1 rear end, the performance envelope on BOTH =
ends of the scale would be awesome!

Using the "lower ratio" (higher numerical number) of the two =
available transmissions, the overall gear sets would be VERY close to =
the average first and final gear ratios of the typical five speed =
equipped Z car.

As for a true "top end car" why not dream a bit.

A 3.36 diff from any early 240-Z manual car would result in a final =
drive of 2.305:1!!

Using a 23.5 inch tall tire, (stock tire height for the 1970-78 Z =
car) an attainable 5500 RPM in overdrive would allow a top end of 150.37 =
mph (not including tire growth).

Freeway cruising speeds (75 MPH) would be a paltry 2750 RPMs. (30+ =
MPG at least).

Tire speed will be 2150 RPM at this speed so a minimum "VR" rated =
tire would be mandatory.

Lastly, it appears that all that is required for a shifter would be =
the stock Z car unit.

Kim Blough
Idaho Z Car
2913 Garrity Blvd.
Nampa, Idaho 83687-2629
1-208-466-0004

GREAT !!!!!
They are cheap enough at junk yards. The only question, do junk yards usually pull them with or without the bell housing ? Will it bolt up to a 3 sp bell housing ? Will 3 sp linkage work ? Will later V6 linkage work ? the shifter and shift quadrant should be able to be adapted.
Comments ???
Irv

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'71 240 Z

Well said Carl. My 83 Maxima did move real good and smooth, miss that car. The curious question was if the 300zx tranni would. work on an L-block. Also, I swear I have seen the 280zx , most likely 83 modles with the overdrive automatics in them. They were usally the 2 tone painted ones.