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Datsun L series auto trans pix


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#21 datzenmike

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Posted 30 November 2007 - 10:43 PM

The only L4N71B with an L series bolt pattern came on the '84 and '84 Maximas. In '85 the VG motors were used with FWD.


Correction, the above should read "came on the '83 and '84 Maximas"

The '82 had the L3N71B with the new locking torque converter.

Sounds like the on/off switch you're talking about might be a torque converter lockup button. My old Geo Storm has a button like that, and it affected all gears while driving like you said, but it was pretty much worthless unless you were on the highway. But I also had the option to shift out of OD into 3rd manually, without locking the converter.

Sounds like your button may lock the converter, and turn OD off, or something like that?


No, this a a true separate 4th gear, an O/D ratio. At highway speeds an electric servo pulls it in, I imagine, so the switch just disables it.
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#22 pope_face

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Posted 02 December 2007 - 02:35 PM

Alright... I'm picking a lot here, and I know what overdrive specifies, but can anyone tell me what locking the torque convertor actually does?
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The author of the above post is not responsible for any damages, injury, scarring (emotional, physical, or otherwise), mental issues, or death due to any actions, thoughts, or feelings caused by the aforementioned post. Advice, thoughts, and opinions are given on an as-is, where-is basis, and the author gives no guarantees, express or implied. All information should be used with caution... If you don't know, don't do it!

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#23 datzenmike

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Posted 02 December 2007 - 03:54 PM

Think of the torque converter as two electric fans facing each other. You turn one on, and it directs a flow of air at the second one, and it begins to turn by itself. Now imagine your L series motor turning a fan, but instead of air, a liquid is used. The liquid pushes past a second fan and turns it. The second fan is connected to the rest of the transmission and drives the rear wheels. Obviously there is a certain amount of slip and the input speed is higher than the output speed, but this is good at low speeds as it allows you to stop in gear with the motor running. As RPMs rise the torque converter's efficiency rises too and the slippage becomes less. This is VERY simplified explanation of fluid coupling.

In the lock up position the second fan can be directly coupled to the first. This can only happen when in third gear with response to a minimum speed set by the governor, and also depends on throttle position. This removes ANY slippage and results in a dropping of 200 to 400 RPMs.
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#24 pope_face

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Posted 03 December 2007 - 11:14 AM

Thanks Mike, that makes a lot of sense... I have a few older ('70's, '80's) auto books, so I look through them sometimes for clarification, so I remember reading a bit about fluid couplings and all... fortunately they still apply to the Datsun...
Fil
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The author of the above post is not responsible for any damages, injury, scarring (emotional, physical, or otherwise), mental issues, or death due to any actions, thoughts, or feelings caused by the aforementioned post. Advice, thoughts, and opinions are given on an as-is, where-is basis, and the author gives no guarantees, express or implied. All information should be used with caution... If you don't know, don't do it!

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1997 Subaru Impreza OBS... "Mishka" (The Daily)

#25 datzenmike

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Posted 29 March 2008 - 03:52 PM

Overdrive is anything lower that 0.999:1. Nissan overdrives vary, from around 0.7:1 to 0.88:1, depending on the application. Overdrive is anytime the gear ratio allows the engine speed to be less than the transmission output RPM (output RPM is "Over" the engine speed). Useful only for highway use.



Automatic..1st....2nd...3rd.. 4th....rev
L4N71B ... 2.458 1.458 1.00 0.686 2.182
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#26 zerow

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Posted 04 April 2008 - 12:45 PM

Automatic..1st....2nd...3rd.. 4th....rev
L4N71B ... 2.458 1.458 1.00 0.686 2.182


Hey Datzenmike, doesn't that mean that 4th is technically a better gearing than even the 5th speed on a FS5 series transmission?? BTW: Excellent write up about this obscure transmission, it helped me find the S.O.B. at my local Pick-N-Pull.
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I saw three of these parked outside the local Starbucks this morning, which tells me only one thing. There's too many self indulgent wieners in this city with too much bloody money. Now, if I was driving a 1973 610 four-door...
You would not be a self indulgent wiener, sir. You'd be a connoisseur.
Precisely. Champagne would fall from the heavens. Doors would open. Velvet ropes would part.
Drive a DATSUN, Then Decide.

My Project
How To: SU Air Cleaners
How To: L4N71B into Early 10 Series
How To: 610 Heater Box Rebuild

#27 datzenmike

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Posted 04 April 2008 - 04:04 PM

Better? depends what you want. The '80-'83zx has an o/d of 0.745 in 5th, so yes, it (L4N71B) would be a larger over drive than that. It wouldn't be better for a heavier truck with small 4 cylinder as is might lower the RPM too much for cruise speed specially against wind or hills. For a much lighter car, a car with gears or a truck with low gears this trans has merit.

The L series L4N71B was used only with L24 six cylinder engines with more torque. In fact 4 cylinder L series engines weren't even made any more when this transmission was built
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#28 zerow

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Posted 04 April 2008 - 04:21 PM

Better? depends what you want. The '80-'83zx has an o/d of 0.745 in 5th, so yes, it (L4N71B) would be a larger over drive than that. It wouldn't be better for a heavier truck with small 4 cylinder as is might lower the RPM too much for cruise speed specially against wind or hills. For a much lighter car, a car with gears or a truck with low gears this trans has merit.

The L series L4N71B was used only with L24 six cylinder engines with more torque. In fact 4 cylinder L series engines weren't even made any more when this transmission was built


Agreed on both counts. I have an Army injury that pevents me from being able to drive stick shift, and for nostalgia sake, my 610 4 door came with automatic anyway, so no hard feelings about the loss there. I would LOVE to have 5 speed, but why have a car you couldn't drive? I lucked out with my find: The L4N71B trans was behind an L20A, extremely rare here stateside, but someone down at the used Japanese engine shop must have seen this L series 6 cylinder and thought it was an L24, and stuck it in the '84 Maxima I found it in. As for my luck, it gave me a 6 bolt flex plate, instead of the 5 bolt which would have been worthless on a L20B. :D
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I saw three of these parked outside the local Starbucks this morning, which tells me only one thing. There's too many self indulgent wieners in this city with too much bloody money. Now, if I was driving a 1973 610 four-door...
You would not be a self indulgent wiener, sir. You'd be a connoisseur.
Precisely. Champagne would fall from the heavens. Doors would open. Velvet ropes would part.
Drive a DATSUN, Then Decide.

My Project
How To: SU Air Cleaners
How To: L4N71B into Early 10 Series
How To: 610 Heater Box Rebuild

#29 zerow

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Posted 13 April 2008 - 06:43 PM

Better? depends what you want. The '80-'83zx has an o/d of 0.745 in 5th, so yes, it (L4N71B) would be a larger over drive than that. It wouldn't be better for a heavier truck with small 4 cylinder as is might lower the RPM too much for cruise speed specially against wind or hills. For a much lighter car, a car with gears or a truck with low gears this trans has merit.

The L series L4N71B was used only with L24 six cylinder engines with more torque. In fact 4 cylinder L series engines weren't even made any more when this transmission was built


Datzenmike, what would you do: I need some advice for my 4 door 610project. I have a parts car 2 door 610 with a set of 3.70:1 gears in the back, but I want some better speed, so I thought getting a set of 3.36:1 gears out of a Turbo Z would be the right thing to do. Now I can't drive stick (nerve damage in legs from Army injury) so I plan to run the 4 speed auto. Which gears would you use? :confused:
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I saw three of these parked outside the local Starbucks this morning, which tells me only one thing. There's too many self indulgent wieners in this city with too much bloody money. Now, if I was driving a 1973 610 four-door...
You would not be a self indulgent wiener, sir. You'd be a connoisseur.
Precisely. Champagne would fall from the heavens. Doors would open. Velvet ropes would part.
Drive a DATSUN, Then Decide.

My Project
How To: SU Air Cleaners
How To: L4N71B into Early 10 Series
How To: 610 Heater Box Rebuild

#30 Guest_jaimesix_*

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Posted 11 May 2008 - 12:12 PM

Hey William.

I was reading this thread. The transmission you have from my car is the 3N718?? or the F4W63? I do not recall, last time I drove on that gear box was 04. My books do not specify which one was in the car. The books mention both.

That gear box is in excellent condition. The ratios as I remember worked very well, no forcing of the engine, no high RPM syndrome. My advise would be to go with that transmission, it is in great shape. If you find you are not satisfied with it later on, you can always look for another one. Good thing is that the one you got is in good shape. Getting a tranny of a junked car is a gamble, and you would be betting your life on any junked trannies.

There are other ways to play with the results, by using another differential. Once the car runs, you will be able to test and tune the car to your particular specifications.

The L20B is an engine that has great torque, the best of them all ( L series 4 cyl.) I guarantee there will be no problems power related.

Like the old cowboys say," No aiming w/o unholstering.":)

#31 zerow

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Posted 12 May 2008 - 09:14 PM

jaimesix - yes to answer your question, the transmission I got from you is the 3N71B, but I was able to score a L4N71B, the 4 speed variant. I want the overdrive, a little less on the RPMs for the freeway driving that I mostly do. Just trying to keep the life in the engine a little longer. I don't doubt the transmission you gave me still has life left in her, just want to have the options available to me. While I have the car in for bodywork, my friend is going to help me fab a mount for the rear of the 4 speed, so I can keep the stock 3 speed available in case I need it. Didn't want you to be disappointed. :mellow:
Posted Image

I saw three of these parked outside the local Starbucks this morning, which tells me only one thing. There's too many self indulgent wieners in this city with too much bloody money. Now, if I was driving a 1973 610 four-door...
You would not be a self indulgent wiener, sir. You'd be a connoisseur.
Precisely. Champagne would fall from the heavens. Doors would open. Velvet ropes would part.
Drive a DATSUN, Then Decide.

My Project
How To: SU Air Cleaners
How To: L4N71B into Early 10 Series
How To: 610 Heater Box Rebuild

#32 Guest_jaimesix_*

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Posted 13 May 2008 - 01:12 AM

Hey William.

No worries, not dissappointed at all. The transmission is in great shape, so it will make a great back up unit.

I drove to Shasta on that transmission/L20B set up, and it drove great, the RPM was not that high. My 710 with 4 speed manual is a lot worse at full speed on 4th gear.

I will be dissappointed if that 4 door never makes it to the roads!

Jaime.______________________________________________________

#33 zerow

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Posted 13 May 2008 - 08:59 PM

Hey William.

I will be dissappointed if that 4 door never makes it to the roads!

Jaime.______________________________________________________


Don't say things like that! It scares me:eek:
Posted Image

I saw three of these parked outside the local Starbucks this morning, which tells me only one thing. There's too many self indulgent wieners in this city with too much bloody money. Now, if I was driving a 1973 610 four-door...
You would not be a self indulgent wiener, sir. You'd be a connoisseur.
Precisely. Champagne would fall from the heavens. Doors would open. Velvet ropes would part.
Drive a DATSUN, Then Decide.

My Project
How To: SU Air Cleaners
How To: L4N71B into Early 10 Series
How To: 610 Heater Box Rebuild

#34 RandyinRenton

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Posted 17 October 2008 - 01:51 PM

So what autotranny was stock in the 79 620? The 3N71? What would be the logical upgrade? (closest to bolt on and easiest to find)

#35 zerow

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Posted 17 October 2008 - 07:45 PM

So what autotranny was stock in the 79 620? The 3N71? What would be the logical upgrade? (closest to bolt on and easiest to find)


Likely to be the 3N71B. Straight 3 speed auto. I am having to fab a custom mount for the L4N71B, which is the 3 speed with overdrive (pushbutton off). You cannot use the 3 speed driveshaft, the output splines are different. So, for logical upgrade? I would say the L3N71B with locking torque converter. Models? I am not sure. Datzenmike would probably know.
Posted Image

I saw three of these parked outside the local Starbucks this morning, which tells me only one thing. There's too many self indulgent wieners in this city with too much bloody money. Now, if I was driving a 1973 610 four-door...
You would not be a self indulgent wiener, sir. You'd be a connoisseur.
Precisely. Champagne would fall from the heavens. Doors would open. Velvet ropes would part.
Drive a DATSUN, Then Decide.

My Project
How To: SU Air Cleaners
How To: L4N71B into Early 10 Series
How To: 610 Heater Box Rebuild

#36 freaky510

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Posted 31 December 2008 - 09:54 AM

Datsun/Nissan Transmissions
Gearing Chart

--------------------------------------------------------------------------------
Notes
Gears ratios/% change on upshift

Tranny Model # description
Application 1st 2nd/% 3rd/% 4th/% 5th/%
510 R3W56L
3 spd column shift 3.263 1.645 1

510 Sedan F4W36L
4 spd "A" type 3.382 2.013/40% 1.312/35% 1/24% w/L14 or L16 motors only
510 Wagon F4W36L
4 spd "A" type 3.657 2.117/42% 1.416/33% 1/30% w/L14 or L16 motors only
Roadster 1500 4 spd 3.515 2.41 1.328 1 Design unique to 1500
Roadster 1600 F4C63L
4 spd "A" type 3.38 2.01 1.31 1 w/Porsche (servo) steel synchros
Roadster 1600 F4W63L
4 spd "A" type 3.38 2.01 1.31 1 w/Warner brass synchros
Roadster 2000 FS5C71A
5 spd "A" type 2.957 1.858/37% 1.311/29% 1/24% 0.852/15% w/Porsche (servo) steel synchros
Roadster 2000 FS5W71A
5 spd "A" type 2.957 1.858/37% 1.311/29% 1/24% 0.852/15% w/Warner brass synchros
240 Z F4W71A
4 spd "A" type 3.549 2.197/39% 1.42/34% 1/30% US spec
240 Z FS5C71A
5 spd "A" type 2.957 1.858/37% 1.311/29% 1/24% 0.864/14% non-US spec
260 Z
(2+2) FS5C71B
5 spd "B" type 2.906 1.902/34% 1.308/31% 1/24% 0.864/14% non-US spec - same as Nismo C/R OD box
240-260 Z F4W71B
4 spd "B" type 3.592 2.246/37% 1.415/35% 1/30%
280 Z F4W71B
4 spd "B" type 3.321 2.077/37% 1.308/37% 1/24%
280 Z FS5W71B
5 spd "B" type 3.321 2.077/37% 1.308/37% 1/24% 0.864/14%
280 ZX (8/78-7/79) FS5W71B
5 spd "B" type 3.321 2.077/37% 1.308/37% 1/24% 0.864/14% also 810 Maxima
280 ZX (8/79-6/80) FS5W71B
5 spd "B" type 3.062 1.858/39% 1.308/30% 1/24% 0.773/23%
280 ZX (7/80-6/83) FS5W71B
5 spd "B" type 3.062 1.858/39% 1.308/30% 1/24% 0.745/26%
280/300 ZXT
(81-84) FS5R90A
5 spd "C" type 3.5 2.144/39% 1.375/36% 1/27% 0.78/22% Borg/Warner made T5
300 ZX F5W71C
5 spd "C" type
300 ZXT (87-89) FS5R30A
5 spd "C" type Nissan made variant of the B/W T5 style tranny
200 SX (70-79) 5 spd 3.382 2.013/40% 1.312/35% 1/24% 0.854/15%

200 SX (6/79-6/81) 5 spd 3.321 2.077/37% 1.308/37% 1/24% 0.864/14% w/Z20E motor
200 SX (7/81-9/83) FS5W71B
5 spd "B" type 3.592 2.246/37% 1.415/35% 1/30% 0.813/19% w/Z22E motor
200 SX (10/83-10/84) 5 spd 3.592 2.057/43% 1.361/34% 1/27% 0.813/19% w/CA20 motor
200 SX (11/84-2/86) 5 spd 3.321 1.902/43% 1.308/31% 1/24% 0.833/17% w/CA20 motor
Nismo
Truck C/R OD FS5C71B
5 spd "B" type 2.906 1.902/34% 1.308/31% 1/24% 0.864/14%
Nismo
Truck W/R OD FS5C71B
5 spd "B" type 3.321 2.077/37% 1.308/37% 1/24% 0.864/14%
Nismo
Truck DD F5C71B
5 spd "B" type 3.321 2.27/32% 1.601/29% 1.24/22% 1/19%
521 Truck
(68-73) F4W36L
4 spd "A" type 3.657
3.382 2.117/42%
2.013/40% 1.416/33%
1.312/35% 1/30%
1/24% w/L4 series motors
used both gearset variations
620 Truck
(74-80) FS5W71B
5 spd "B" type 3.592 2.246/37% 1.415/35% 1/30% 0.813/19% w/L16 and L20B motors
720/D20 Truck
(80-86) FS5W71B
5 spd "B" type 3.592 2.057/43% 1.361/34% 1/27% 0.813/19% w/L20B, Z20, Z22, & Z24 motors
D21 Truck
(86 and up) FS5R30A
5 spd "C" type




Nissan made variant of the B/W T5 style tranny
Nismo
W/R OD FS5C71B
5 spd "B" type 3.321 2.077/37% 1.308/37% 1/24% 0.864/14%
Nismo
C/R OD FS5C71B
5 spd "B" type 2.906 1.902/34% 1.308/31% 1/24% 0.864/14%
Nismo Opt 1 DD F5C71B
5 spd "B" type 2.818 1.973/30% 1.47/25% 1.192/19% 1/16%
Nismo Opt 2 DD F5C71B
5 spd "B" type 2.348 1.601/32% 1.296/19% 1.138/12% 1/12%
Nismo Opt 3 DD F5C71B
5 spd "B" type 2.192 1.601/27% 1.47/8% 1.138/23% 1/12%
Nismo Rally DD F5C71B
5 spd "B" type 3.321 2.27/32% 1.601/29% 1.24/22% 1/19%
Nismo
Ultra C/R FS5C71A
5 spd "A" type 1.858 1.388/25% 1.217/12% 1/18% 0.852/15%
Nismo
Middle C/R FS5C71A
5 spd "A" type 2.678 1.704/36% 1.262/26% 1/21% 0.852/15%
F - Type of control F=Floor (direct) R= Remote
Abreviations S - Tranny style S=special overdrive top gear (no letter indicates direct drive top gear)
C/R=close ratio 5 - Number of forward gears 3 spd, 4 spd, or 5 spd
W/R=wide ratio C - Drive/Synchro type F=front wheel drive R= rear wheel drive W= Warner synchros C=servo synchros
OD=overdrive 71 - Gear-pair center-to-center spacing in mm (distance between mainshaft and countershaft)
DD=Direct drive A - Sequential model version suffix (alphabetical)
"A" type - shifters are rubber mounted (infamous monkey motion) "B" type - shifters have a solid cross pin
"C" type - shifters are retained in a top cover plate by a circlip (called a "top loader" in American tranny

http://www.gracielan...k/gearing2.html
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#37 datsun 160J SSS

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Posted 07 May 2009 - 04:39 PM

hay thats some good information .

#38 slam_dat_sun

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Posted 02 September 2009 - 08:14 PM

Well my question is super duper simple , what transmission has overdrive that will bolt up to my l18 in my 1074 629 short bed ? without no modification like changing how long my drive shaft is or modding my transmission mounts or anything like that .

#39 Charlie69

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Posted 14 January 2010 - 05:52 PM

Datzenmike, can the lock up torque converter be used in an older transmission (3N71B or L4N71B) that did not originally have a lockup torque converter?

Do you happen to know the part # for the lockup torque converter?

#40 Charlie69

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Posted 14 January 2010 - 05:52 PM

How does the L4N71B do coupled to a stock L20B?

What gearing would you suggest for my 520 with an L20B & 3N71B?

What gearing would you suggest for my 520 with an L20B & L4N71B?