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5-speed 71-series Transmission are inexpensive and available from about 1975-1995. 71 gearboxes can be modified to fit Datsun 1200. Just cut the bellhousing and weld on a fragment of A-series bell housing, then machine the input shaft smaller.
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Cut and Shut
Since the 71-series gearboxes do not have bellhousings, a simple adapter plate won't work. Instead, use the Cut-n-Shut method on the front case.
Pilot Bushing
* 32202-B9500 BUSHING-CRANKSHAFT * used on L, Z, VG, VQ, SR, KA, and CD engines (same as 71C bushing) * Pilot Bushing Inside Diameter: 0.626 to .6300' (Length: .689') * Pilot Bushing Outside Diameter: .814 to .815'
Since this is much larger in diameter than the A-series, machining of the input shaft is needed. Then the stock A12 bushing can be retained.
A-series crankshaft bore is for a bushing with 0.671" O.D., length .723"
- The input shaft end can be turned down to ~.671 O.D.
- Could the A-series crank pilot hole be bored out to .814' so the 71-Series bush can be fitted?
Input shaft end turned down to smaller diameter
Clutch Disc
71-series clutch disc [200mm or 240mm diameter] * Spline O.D.: 1" * Spline: 24 teeth
There is an A-series clutch disc that is 1" x 24T: 30100-K0500.
Input Shaft
How far does the input shaft extend past the transmission face?
- 5-speed: about 17mm past the flange
Flywheel
Use the stock A-series flywheel, which accepts the 180 mm clutch disc. Use the L-series 180 mm clutch disc.
Clutch Release
Use the 71 release lever and throwout bearing. Use a Datsun 1200 hydraulic clutch master cylinder.
Gearshift Location
Comparision of Nissan 6-speed with long-5-speed and short 4-speed. The location of the shifter is close to the location of stumpy gearbox shifter.
Rear Crossmember
Propeller Shaft
If you use a stumpy gearbox, the stock 1200 automatic driveshaft will work.
If you use a longer gearbox, have a custom-length propeller shaft fabricated.
6-speed vs 71C long vs 71B long vs F4W63 stumpy
