Revision as of 00:29, 14 January 2017

A 4-speed JATCO L4N71 was made during the 1980s. The top gear is an overdrive ratio, for reduced revs at highway speeds. It also has a lockup system (3rd and fourth gears are direct) for fuel-economy approaching that of a manual transmission in 3rd. Expect it to get better highway fuel economy than a stock 4-speed 1200, since the 4N71B has overdrive.

Overview

Will it fit into an automatic-bodied Datsun 1200? Unknown -- try it and let us know. Use an A-series automatic bell housing. The 4N71B is about 4 inches longer than the short 3N71B (as used in B110 and 510), and is thicker at the back, so you may need to widen the back part of the Datsun 1200 automatic transmission tunnel (or maybe not).

There are at least two lengths of the 4N71B, so use the shorter model if possible.

Sources

* 1984-1989 Chrysler, Dodge Plymouth (Mitsubishi)
* 1983-1989 Mitsubishi
* 1984-1989 Nissan Cars
* 1986-1989 Nissan Pick-ups, Vans
* 1984-1993 Mazda Cars
* 1988-1995 Mazda Trucks
* 1986-1988 GM VL with Nissan RB six-cylinder

JATCO 4N71B series
* LN471B: Light duty
* EN471B: Medium duty

Australia Models
* General Motors Commodore VL (1986-1988)
  models with Nissan RB engine

US Models
* Nissan Maxima 1983 (L-series bell housing)
* Nissan Pathfinder 1986-1989
* Nissan Van 1987-1989 (the 'rare as' USA Vanette)
* Mazda 929 1988-1990
* Mazda B2000\B2600 1987-1991
  1987-1988 has Mitsubishi bell housing?
* Mazda Miata 1991-1997 (Mazda N4A-EL)
* Mazda RX7 1984-1988

Also:
* 1984–1988 Nissan 200SX
* 1984–1989 Dodge/Plymouth Conquest (Mitsubishi)
* 1984– Mitsubishi Starion
* 1986–1989 Nissan pickup
* 1989–1995 Mazda MPV

E4N71B 
* 1984–1989 Nissan 300ZX
* 1984–1989 Dodge Conquest
* 1987–1988 Nissan 200SX

Has two drawing of 4N71B vs 3N71B: http://forums.hybridz.org/showthread.php?t=130117
Looks like six inches of length added in the middle. Datsun B110 auto 3N71B already uses the short tailshaft, so

Comparo of 3-speed to 4-speed

4-speed is bigger around at the back, may need tunnel mods
New rear engine crossmember (gearbox crossmember) will need to be fabricated
Wiring changes are needed
Swap converter housing with an A-series one
Stall speeds vary, so swapping converters may be needed to find one that suits the small engine

Approximate Junkyard Costs:

L4N71B 4-speed OD transmission from Pick-N-Pull: $130
Flex plate including crank shaft spacers: $20
Auto shift lever from early Datsun: $18
Kickdown switch and mounting bracket from early Datsun: $3.50
Automatic-size Brake pedal: $3
Maintenance items (filter, seals, modulator): $32
Hard fluid lines from B310: $9
Flexible Fluid hoses: $10
Radiator with auto-trans coolor lines: ?
Driveshaft shortened, rebuilt, balanced: $165
- length is 2.7 cm (about one inch) longer
New rear transmission mount: $25
Hardware (bolts, nuts, metal spacers): $15
L3N71A/L3N71B converter housing for A-series engine
- Will this fit on the L4N71B?

references:
* Zcar.com
* Ratsun

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L4N71B Swap

Revision as of 00:29, 14 January 2017

Overview

Sources