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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.
Overview
Will it fit into an automatic-bodied Datsun 1200? Unknown -- try it and let us know.
Sources
JATCO 4N71B series:
- LN471B: Light duty
- EN471B: Medium duty
The 4N71B 4-speed automatic came in Maximas and 200SX (silvia) models, as well as in Datsun pickups and Mazdas.
Australia Models
- VL Commodore
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
- 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.
Comparo of 3-speed to 4-speed
- 4-speed is bigger around at the back, probably requires 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
- Maintainence 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:
More generally:
- 84-89 Chrysler, Dodge Plymouth
- 83-89 Mitsubishi
- 84-89 Nissan Cars
- 86-89 Nissan Pick-ups, Vans
- 84-93 Mazda Cars
- 88-95 Mazda Trucks