1985 720 4 speed automatic tranny

[bryant2482]

does anyone know of any 4 or possibly a 5 speed automatic transmission that would bolt up to a 85 720 with the z24?

[zerow]

L4N71B. You will need the bellhousing from a Z22 or Z24 to work. Datzenmike would be the expert on this...

[bryant2482]

L4N71B. You will need the bellhousing from a Z22 or Z24 to work. Datzenmike would be the expert on this...

 

ok cool. thanks bro. another option i had was if anyone knew if a 4 or 5 speed manual from a toyota pickup would work cuz ive seen pics of the 22r engine and the bolt patterns look identical to the z24

[datzenmike]

L4N71B. You will need the bellhousing from a Z22 or Z24 to work. Datzenmike would be the expert on this...

 

The L4N71B I had has a specific bell housing and the earlier 3N71B isn't quite the same. Different length front to back.

 

The 2wd Z24i powered '86.5-'89 D21 Hardbody used an L4N71B 4 spd. auto. The '89 and on used a KA motor but the transmission design changed and needs some electronic input from the ECU/speed sensor/smog-whatever to help it shift or make it shift.

 

Even harder to find would be the '87-'89? Nissan Van. It too had RWD Z24i and did also have the L4N71B 4 speed auto.

 

The L4N71B was first used in the '83-'84 Maxima with an L motor yet strangely not in the sister car the 280zx for some reason.... also used in the S12, the 300zx and the Pathfinder but were either CA or VG powered so the bell would be wrong.

 

 

 

 

 

 

 

 

....from a toyota pickup would work cuz ive seen pics of the 22r engine and the bolt patterns look identical to the z24

 

Looks are deceiving. I will say that the JATCO transmissions (even the L4N71B) was made for use on other makes of vehicles including Dodge and Plymouth Conquests, Mazda Miata, MPV and RX-7, Mitsubishi Starion .

[ggzilla]

The N71B has removable bell housing. But to find the right bell housing, you might as well get the whole tranmission.

 

Toyata and Nissan use different bell patterns. They only look similar.

[bryant2482]

The N71B has removable bell housing. But to find the right bell housing, you might as well get the whole tranmission.

 

Toyata and Nissan use different bell patterns. They only look similar.

 

i think i might just rebuild the one ive got and maybe do the ka swap

[bryant2482]

The L4N71B I had has a specific bell housing and the earlier 3N71B isn't quite the same. Different length front to back.

 

The 2wd Z24i powered '86.5-'89 D21 Hardbody used an L4N71B 4 spd. auto. The '89 and on used a KA motor but the transmission design changed and needs some electronic input from the ECU/speed sensor/smog-whatever to help it shift or make it shift.

 

Even harder to find would be the '87-'89? Nissan Van. It too had RWD Z24i and did also have the L4N71B 4 speed auto.

 

The L4N71B was first used in the '83-'84 Maxima with an L motor yet strangely not in the sister car the 280zx for some reason.... also used in the S12, the 300zx and the Pathfinder but were either CA or VG powered so the bell would be wrong.

 

 

 

 

 

 

 

 

 

 

Looks are deceiving. I will say that the JATCO transmissions (even the L4N71B) was made for use on other makes of vehicles including Dodge and Plymouth Conquests, Mazda Miata, MPV and RX-7, Mitsubishi Starion .

 

 

do you know what the gear ratios are for the 4 and 5 speed trannys?

[datzenmike]

The 4 speed automatic?

 

Or the 4 and 5 speed standards?

 

 

On the 720 there were 2 different gear sets used on the 4 and the 5 speeds, the five speeds simply having an extra overdrive gear.

 

 

Wide ratio 4 and 5 speed, used on all '80 2 and 4 wd and only on 4x4, Cab/Chassis and diesel from '81 on.

1st.... 3.592

2nd... 2.246

3rd.... 1.415

4th.... 1.000 (four speed only)*

5th.... 0.882 (five speed only)

 

Close ratio 4 and 5 speed, used '81 and on 2wd

1st.... 3.321

2nd... 2.077

3rd.... 1.308

4th.... 1.000 (four speed only)*

5th.... 0.833 (five speed only)

 

* There were no 4 speed 720s after Oct '82

[Madkaw]

Old thread but will the overdrive auto hold up for the 4x4 720 - 83 . 
anyone have length differences . Anyone do this swap?

[datzenmike]

The early D21 Hardbody Z24i automatics ('86-'89?) were the 4 speed OD. So yes. IIRC they are within an inch of the 31.5" length but can't remember weather shorter or longer.

 

For some reason Nissan didn't use automatics on the 4x4. It would be interesting.

[thajamma]

If I have a 1985 Nissan pickup with a manual transmission, and I want to replace it, what other vehicles or years use the same transmission that will go in without modification. 

[datzenmike]

 

Best would be one from another '83-'86.5 Z24 powered 720.

 

The actual bell housing bolts onto the automatic body so it can be swapped onto another automatic that was on a completely different engine as long as it was equipped with the locking TC.

 

With the introduction of the Z24 in '83 the automatic was up graded with a locking torque converter. This would kick in at around 45 MPH at light throttle and the RPMs would drop one or two hundred RPMs in 3rd. There were only the S110 200sx, the S12 and the 280zx that were rear wheel drive in around this time and also switched to locking TC on the 3N71B and after '86.5 only 4 speed automatics were used.  Just swap your Z24 bell housing on.

 

Locking torque converter 3N71B...

The 280zx had it only the last year, '83

The S110 200sx switched for '81 through '83 (* does not need bell swap as Z series engine)

The S12 200sx all CA20E had it to '86.5 but not the CA18ET (only 5 speeds?)

 

Non locking 3N71B... 

'80-'82 720

'80 S110 200sx (both were Z series engines so bolt right on)